Groups > linux.kernel > #1243900 > unrolled thread

Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files

Started by	Hauke Mehrtens <hauke@hauke-m.de>
First post	2015-10-10 16:40 +0200
Last post	2015-10-14 17:40 +0200
Articles	4 — 3 participants

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

  Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files Hauke Mehrtens <hauke@hauke-m.de> - 2015-10-10 16:40 +0200
    Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files Jon Mason <jonmason@broadcom.com> - 2015-10-13 23:40 +0200
      Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files Ray Jui <rjui@broadcom.com> - 2015-10-14 00:50 +0200
        Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files Jon Mason <jonmason@broadcom.com> - 2015-10-14 17:40 +0200

#1243900 — Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files

From	Hauke Mehrtens <hauke@hauke-m.de>
Date	2015-10-10 16:40 +0200
Subject	Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files
Message-ID	<qi3tv-3Hf-9@gated-at.bofh.it>

On 10/03/2015 12:22 AM, Jon Mason wrote:
> Add device tree files for Broadcom Northstar based SVKs.  Since the
> bcm5301x.dtsi already exists, all that is necessary is the dts files to
> enable the UARTs (and specify the RAM size for the 4708/9).  With these
> files, the SVKs are able to boot to shell.
> 
> Signed-off-by: Jon Mason <jonmason@broadcom.com>
> ---
>  arch/arm/boot/dts/Makefile       |  5 +++-
>  arch/arm/boot/dts/bcm94708.dts   | 52 +++++++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/bcm94709.dts   | 52 +++++++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/bcm953012k.dts | 59 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 167 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/bcm94708.dts
>  create mode 100644 arch/arm/boot/dts/bcm94709.dts
>  create mode 100644 arch/arm/boot/dts/bcm953012k.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 233159d..96a1b58 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -72,7 +72,10 @@ dtb-$(CONFIG_ARCH_BCM_5301X) += \
>  	bcm47081-buffalo-wzr-900dhp.dtb \
>  	bcm4709-asus-rt-ac87u.dtb \
>  	bcm4709-buffalo-wxr-1900dhp.dtb \
> -	bcm4709-netgear-r8000.dtb
> +	bcm4709-netgear-r8000.dtb \
> +	bcm94708.dtb \
> +	bcm94709.dtb \
> +	bcm953012k.dtb
>  dtb-$(CONFIG_ARCH_BCM_63XX) += \
>  	bcm963138dvt.dtb
>  dtb-$(CONFIG_ARCH_BCM_CYGNUS) += \
> diff --git a/arch/arm/boot/dts/bcm94708.dts b/arch/arm/boot/dts/bcm94708.dts
> new file mode 100644
> index 0000000..57a74c6
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm94708.dts

Currently the files are named beginning with the chip name something
like this should fit better the other naming schema:
arch/arm/boot/dts/bcm4708-brcm-bcm94708.dts

> @@ -0,0 +1,52 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM94708)";
> +	compatible = "brcm,bcm4708";

The compatible string should also contain this exactly board like this:
compatible = "brcm,bcm94708", "brcm,bcm4708";

> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200 mem=128M";

Instead of using mem=128M you should add an extra node like this:

	memory {
		reg = <0x00000000 0x08000000>;
	};

Does this board only has 128M of RAM? currently we restrict all of them
to that, but I just want to know.

> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> diff --git a/arch/arm/boot/dts/bcm94709.dts b/arch/arm/boot/dts/bcm94709.dts
> new file mode 100644
> index 0000000..bf4b6e1
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm94709.dts
> @@ -0,0 +1,52 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM94709)";
> +	compatible = "brcm,bcm4709", "brcm,bcm4708";
Better this:
compatible = "brcm,bcm94709", "brcm,bcm4709", "brcm,bcm4708";

> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200 mem=128M";
same as above.

> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> diff --git a/arch/arm/boot/dts/bcm953012k.dts b/arch/arm/boot/dts/bcm953012k.dts
> new file mode 100644
> index 0000000..1726ba0
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm953012k.dts
> @@ -0,0 +1,59 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM953012K)";
> +	compatible = "brcm,bcm5301k", "brcm,bcm4708";

same as other file.

> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200";

Why is no memory size given here at all?

> +	};
> +};
> +
> +&uart0 {
> +	clock-frequency = <62499840>;

Just out of curiosity on what does this clock frequency depend? I saw
your patch adding a real clock driver which should make this obsolete.

> +	status = "okay";
> +};
> +
> +&uart1 {
> +	clock-frequency = <62499840>;
> +	status = "okay";
> +};
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [next] | [standalone]

#1246180

From	Jon Mason <jonmason@broadcom.com>
Date	2015-10-13 23:40 +0200
Message-ID	<qjfsC-28J-27@gated-at.bofh.it>
In reply to	#1243900

On Sat, Oct 10, 2015 at 04:39:00PM +0200, Hauke Mehrtens wrote:
> On 10/03/2015 12:22 AM, Jon Mason wrote:
> > Add device tree files for Broadcom Northstar based SVKs.  Since the
> > bcm5301x.dtsi already exists, all that is necessary is the dts files to
> > enable the UARTs (and specify the RAM size for the 4708/9).  With these
> > files, the SVKs are able to boot to shell.
> > 
> > Signed-off-by: Jon Mason <jonmason@broadcom.com>
> > ---
> >  arch/arm/boot/dts/Makefile       |  5 +++-
> >  arch/arm/boot/dts/bcm94708.dts   | 52 +++++++++++++++++++++++++++++++++++
> >  arch/arm/boot/dts/bcm94709.dts   | 52 +++++++++++++++++++++++++++++++++++
> >  arch/arm/boot/dts/bcm953012k.dts | 59 ++++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 167 insertions(+), 1 deletion(-)
> >  create mode 100644 arch/arm/boot/dts/bcm94708.dts
> >  create mode 100644 arch/arm/boot/dts/bcm94709.dts
> >  create mode 100644 arch/arm/boot/dts/bcm953012k.dts
> > 
> > diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> > index 233159d..96a1b58 100644
> > --- a/arch/arm/boot/dts/Makefile
> > +++ b/arch/arm/boot/dts/Makefile
> > @@ -72,7 +72,10 @@ dtb-$(CONFIG_ARCH_BCM_5301X) += \
> >  	bcm47081-buffalo-wzr-900dhp.dtb \
> >  	bcm4709-asus-rt-ac87u.dtb \
> >  	bcm4709-buffalo-wxr-1900dhp.dtb \
> > -	bcm4709-netgear-r8000.dtb
> > +	bcm4709-netgear-r8000.dtb \
> > +	bcm94708.dtb \
> > +	bcm94709.dtb \
> > +	bcm953012k.dtb
> >  dtb-$(CONFIG_ARCH_BCM_63XX) += \
> >  	bcm963138dvt.dtb
> >  dtb-$(CONFIG_ARCH_BCM_CYGNUS) += \
> > diff --git a/arch/arm/boot/dts/bcm94708.dts b/arch/arm/boot/dts/bcm94708.dts
> > new file mode 100644
> > index 0000000..57a74c6
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/bcm94708.dts
> 
> Currently the files are named beginning with the chip name something
> like this should fit better the other naming schema:
> arch/arm/boot/dts/bcm4708-brcm-bcm94708.dts

Sorry, I was following the namign schema that we've been using on
other Broadcom SVKs in the Linux device tree directory.  For example,
arch/arm/boot/dts/bcm911360_entphn.dts
arch/arm/boot/dts/bcm911360k.dts
arch/arm/boot/dts/bcm958300k.dts
arch/arm/boot/dts/bcm958305k.dts
arch/arm/boot/dts/bcm958625k.dts
arch/arm/boot/dts/bcm963138dvt.dts

Also, this is the name we have been using internally.  So, it will
making migrating to newer kernels much easier.

> 
> > @@ -0,0 +1,52 @@
> > +/*
> > + *  BSD LICENSE
> > + *
> > + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> > + *
> > + *  Redistribution and use in source and binary forms, with or without
> > + *  modification, are permitted provided that the following conditions
> > + *  are met:
> > + *
> > + *    * Redistributions of source code must retain the above copyright
> > + *      notice, this list of conditions and the following disclaimer.
> > + *    * Redistributions in binary form must reproduce the above copyright
> > + *      notice, this list of conditions and the following disclaimer in
> > + *      the documentation and/or other materials provided with the
> > + *      distribution.
> > + *    * Neither the name of Broadcom Corporation nor the names of its
> > + *      contributors may be used to endorse or promote products derived
> > + *      from this software without specific prior written permission.
> > + *
> > + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> > + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> > + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> > + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> > + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> > + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> > + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> > + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> > + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> > + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> > + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "bcm5301x.dtsi"
> > +
> > +/ {
> > +	model = "NorthStar SVK (BCM94708)";
> > +	compatible = "brcm,bcm4708";
> 
> The compatible string should also contain this exactly board like this:
> compatible = "brcm,bcm94708", "brcm,bcm4708";

Ok 

> 
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +	};
> > +
> > +	chosen {
> > +		bootargs = "console=ttyS0,115200 mem=128M";
> 
> Instead of using mem=128M you should add an extra node like this:
> 
> 	memory {
> 		reg = <0x00000000 0x08000000>;
> 	};
> 
> Does this board only has 128M of RAM? currently we restrict all of them
> to that, but I just want to know.

The 4708/9 SVKs have 128M, but the 53012 has 256M.

> 
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	status = "okay";
> > +};
> > diff --git a/arch/arm/boot/dts/bcm94709.dts b/arch/arm/boot/dts/bcm94709.dts
> > new file mode 100644
> > index 0000000..bf4b6e1
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/bcm94709.dts
> > @@ -0,0 +1,52 @@
> > +/*
> > + *  BSD LICENSE
> > + *
> > + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> > + *
> > + *  Redistribution and use in source and binary forms, with or without
> > + *  modification, are permitted provided that the following conditions
> > + *  are met:
> > + *
> > + *    * Redistributions of source code must retain the above copyright
> > + *      notice, this list of conditions and the following disclaimer.
> > + *    * Redistributions in binary form must reproduce the above copyright
> > + *      notice, this list of conditions and the following disclaimer in
> > + *      the documentation and/or other materials provided with the
> > + *      distribution.
> > + *    * Neither the name of Broadcom Corporation nor the names of its
> > + *      contributors may be used to endorse or promote products derived
> > + *      from this software without specific prior written permission.
> > + *
> > + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> > + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> > + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> > + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> > + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> > + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> > + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> > + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> > + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> > + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> > + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "bcm5301x.dtsi"
> > +
> > +/ {
> > +	model = "NorthStar SVK (BCM94709)";
> > +	compatible = "brcm,bcm4709", "brcm,bcm4708";
> Better this:
> compatible = "brcm,bcm94709", "brcm,bcm4709", "brcm,bcm4708";

It seems to me that this who 4708 base is kind of a misnomer.  They
really are "Northstar".  Would it not be more accurate to change it to
be
compatible = "brcm,bcm4709", "brcm,ns";
?

> 
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +	};
> > +
> > +	chosen {
> > +		bootargs = "console=ttyS0,115200 mem=128M";
> same as above.

Ok
 
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	status = "okay";
> > +};
> > diff --git a/arch/arm/boot/dts/bcm953012k.dts b/arch/arm/boot/dts/bcm953012k.dts
> > new file mode 100644
> > index 0000000..1726ba0
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/bcm953012k.dts
> > @@ -0,0 +1,59 @@
> > +/*
> > + *  BSD LICENSE
> > + *
> > + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> > + *
> > + *  Redistribution and use in source and binary forms, with or without
> > + *  modification, are permitted provided that the following conditions
> > + *  are met:
> > + *
> > + *    * Redistributions of source code must retain the above copyright
> > + *      notice, this list of conditions and the following disclaimer.
> > + *    * Redistributions in binary form must reproduce the above copyright
> > + *      notice, this list of conditions and the following disclaimer in
> > + *      the documentation and/or other materials provided with the
> > + *      distribution.
> > + *    * Neither the name of Broadcom Corporation nor the names of its
> > + *      contributors may be used to endorse or promote products derived
> > + *      from this software without specific prior written permission.
> > + *
> > + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> > + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> > + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> > + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> > + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> > + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> > + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> > + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> > + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> > + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> > + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "bcm5301x.dtsi"
> > +
> > +/ {
> > +	model = "NorthStar SVK (BCM953012K)";
> > +	compatible = "brcm,bcm5301k", "brcm,bcm4708";
> 
> same as other file.
> 
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +		serial1 = &uart1;
> > +	};
> > +
> > +	chosen {
> > +		bootargs = "console=ttyS0,115200";
> 
> Why is no memory size given here at all?

I'll add the 256M.

> 
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	clock-frequency = <62499840>;
> 
> Just out of curiosity on what does this clock frequency depend? I saw
> your patch adding a real clock driver which should make this obsolete.
 
Better to add this now, as the device tree part might be out of sync
for a time.  Also, is it not better to make the UARTs a static clock
and not dependent on the clk driver?

Thanks,
Jon

> > +	status = "okay";
> > +};
> > +
> > +&uart1 {
> > +	clock-frequency = <62499840>;
> > +	status = "okay";
> > +};
> > 
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1246211

From	Ray Jui <rjui@broadcom.com>
Date	2015-10-14 00:50 +0200
Message-ID	<qjgym-3GV-17@gated-at.bofh.it>
In reply to	#1246180

On 10/13/2015 2:38 PM, Jon Mason wrote:
> On Sat, Oct 10, 2015 at 04:39:00PM +0200, Hauke Mehrtens wrote:
>> On 10/03/2015 12:22 AM, Jon Mason wrote:
>>> Add device tree files for Broadcom Northstar based SVKs.  Since the
>>> bcm5301x.dtsi already exists, all that is necessary is the dts files to
>>> enable the UARTs (and specify the RAM size for the 4708/9).  With these
>>> files, the SVKs are able to boot to shell.
>>>
>>> Signed-off-by: Jon Mason <jonmason@broadcom.com>
>>> ---
>>>  arch/arm/boot/dts/Makefile       |  5 +++-
>>>  arch/arm/boot/dts/bcm94708.dts   | 52 +++++++++++++++++++++++++++++++++++
>>>  arch/arm/boot/dts/bcm94709.dts   | 52 +++++++++++++++++++++++++++++++++++
>>>  arch/arm/boot/dts/bcm953012k.dts | 59 ++++++++++++++++++++++++++++++++++++++++
>>>  4 files changed, 167 insertions(+), 1 deletion(-)
>>>  create mode 100644 arch/arm/boot/dts/bcm94708.dts
>>>  create mode 100644 arch/arm/boot/dts/bcm94709.dts
>>>  create mode 100644 arch/arm/boot/dts/bcm953012k.dts
>>>

>>> +&uart0 {
>>> +	clock-frequency = <62499840>;
>>
>> Just out of curiosity on what does this clock frequency depend? I saw
>> your patch adding a real clock driver which should make this obsolete.
>  
> Better to add this now, as the device tree part might be out of sync
> for a time.

Sure, this can potentially be a reason to not using the real clock node
and just use a hardcoded clock frequency for now, until the other clock
change is merged, then you can submit another patch to use it.

Also, is it not better to make the UARTs a static clock
> and not dependent on the clk driver?
> 

I disagree. You should always use the real clock driver for querying the
clock frequency, in the case when the clock driver is available.

Today one can change the core clock for UART in the bootloader for
various reasons (and we saw that happening a lot in the past), which in
this case will make your kernel not seeing any console output.

By always querying the clock rate based on real registers instead of a
hardcoded value, you don't have that issue and your kernel is less
dependent on any changes in the bootloader.

> Thanks,
> Jon
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1246900

From	Jon Mason <jonmason@broadcom.com>
Date	2015-10-14 17:40 +0200
Message-ID	<qjwjL-2JS-1@gated-at.bofh.it>
In reply to	#1246211

On Tue, Oct 13, 2015 at 03:43:20PM -0700, Ray Jui wrote:
> 
> 
> On 10/13/2015 2:38 PM, Jon Mason wrote:
> > On Sat, Oct 10, 2015 at 04:39:00PM +0200, Hauke Mehrtens wrote:
> >> On 10/03/2015 12:22 AM, Jon Mason wrote:
> >>> Add device tree files for Broadcom Northstar based SVKs.  Since the
> >>> bcm5301x.dtsi already exists, all that is necessary is the dts files to
> >>> enable the UARTs (and specify the RAM size for the 4708/9).  With these
> >>> files, the SVKs are able to boot to shell.
> >>>
> >>> Signed-off-by: Jon Mason <jonmason@broadcom.com>
> >>> ---
> >>>  arch/arm/boot/dts/Makefile       |  5 +++-
> >>>  arch/arm/boot/dts/bcm94708.dts   | 52 +++++++++++++++++++++++++++++++++++
> >>>  arch/arm/boot/dts/bcm94709.dts   | 52 +++++++++++++++++++++++++++++++++++
> >>>  arch/arm/boot/dts/bcm953012k.dts | 59 ++++++++++++++++++++++++++++++++++++++++
> >>>  4 files changed, 167 insertions(+), 1 deletion(-)
> >>>  create mode 100644 arch/arm/boot/dts/bcm94708.dts
> >>>  create mode 100644 arch/arm/boot/dts/bcm94709.dts
> >>>  create mode 100644 arch/arm/boot/dts/bcm953012k.dts
> >>>
> 
> >>> +&uart0 {
> >>> +	clock-frequency = <62499840>;
> >>
> >> Just out of curiosity on what does this clock frequency depend? I saw
> >> your patch adding a real clock driver which should make this obsolete.
> >  
> > Better to add this now, as the device tree part might be out of sync
> > for a time.
> 
> Sure, this can potentially be a reason to not using the real clock node
> and just use a hardcoded clock frequency for now, until the other clock
> change is merged, then you can submit another patch to use it.
> 
> Also, is it not better to make the UARTs a static clock
> > and not dependent on the clk driver?
> > 
> 
> I disagree. You should always use the real clock driver for querying the
> clock frequency, in the case when the clock driver is available.
> 
> Today one can change the core clock for UART in the bootloader for
> various reasons (and we saw that happening a lot in the past), which in
> this case will make your kernel not seeing any console output.
> 
> By always querying the clock rate based on real registers instead of a
> hardcoded value, you don't have that issue and your kernel is less
> dependent on any changes in the bootloader.

Fair enough.  This is moot until the clk driver changes get pulled in.
This file can be changed at that time :)

Thanks,
Jon


> 
> > Thanks,
> > Jon
> > 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [standalone]

csiph-web

Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files

Contents

#1243900 — Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files

#1246180

#1246211

#1246900