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Re: [PATCH 3/3] serial: amba-pl011: add ACPI support to AMBA probe

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  Re: [PATCH 3/3] serial: amba-pl011: add ACPI support to AMBA probe "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-12-01 03:00 +0100
    Re: [PATCH 3/3] serial: amba-pl011: add ACPI support to AMBA probe Graeme Gregory <gg@slimlogic.co.uk> - 2015-12-01 13:30 +0100
      Re: [PATCH 3/3] serial: amba-pl011: add ACPI support to AMBA probe "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-12-02 02:00 +0100

#1280490 — Re: [PATCH 3/3] serial: amba-pl011: add ACPI support to AMBA probe

On Wednesday, September 30, 2015 11:38:50 AM Graeme Gregory wrote:
> In ACPI this device is only defined in SBSA mode so
> if we are probing from ACPI use this mode.
> 
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Len Brown <lenb@kernel.org>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> ---
>  drivers/tty/serial/amba-pl011.c | 32 +++++++++++++++++++++-----------
>  1 file changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index fd27e98..55209aa 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2368,18 +2368,28 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
>  	if (!uap)
>  		return -ENOMEM;
>  
> -	uap->clk = devm_clk_get(&dev->dev, NULL);
> -	if (IS_ERR(uap->clk))
> -		return PTR_ERR(uap->clk);
> -
> -	uap->vendor = vendor;
> -	uap->lcrh_rx = vendor->lcrh_rx;
> -	uap->lcrh_tx = vendor->lcrh_tx;
> -	uap->fifosize = vendor->get_fifosize(dev);
> +	/* ACPI only defines SBSA variant */
> +	if (!ACPI_COMPANION(&dev->dev)) {

It would read more straightforward if you did

	if (ACPI_COMPANION(&dev->dev)) {
		<handle the ACPI case>
	} else {
		<handle the non-ACPI case>
	}

> +		uap->clk = devm_clk_get(&dev->dev, NULL);
> +		if (IS_ERR(uap->clk))
> +			return PTR_ERR(uap->clk);
> +
> +		uap->vendor = vendor;
> +		uap->lcrh_rx = vendor->lcrh_rx;
> +		uap->lcrh_tx = vendor->lcrh_tx;
> +		uap->fifosize = vendor->get_fifosize(dev);
> +		uap->port.ops = &amba_pl011_pops;
> +		snprintf(uap->type, sizeof(uap->type), "PL011 rev%u",
> +				amba_rev(dev));
> +	 } else {
> +		uap->vendor	= &vendor_sbsa;
> +		uap->fifosize	= 32;
> +		uap->port.ops	= &sbsa_uart_pops;
> +		uap->fixed_baud = 115200;
> +
> +		snprintf(uap->type, sizeof(uap->type), "SBSA");

This looks sort of heavy-handed.

Is this the only possible configuration of the device in the ACPI case?

> +	}
>  	uap->port.irq = dev->irq[0];
> -	uap->port.ops = &amba_pl011_pops;
> -
> -	snprintf(uap->type, sizeof(uap->type), "PL011 rev%u", amba_rev(dev));
>  
>  	ret = pl011_setup_port(&dev->dev, uap, &dev->res, portnr);
>  	if (ret)

Thanks,
Rafael

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#1280821

On Tue, Dec 01, 2015 at 03:21:47AM +0100, Rafael J. Wysocki wrote:
> On Wednesday, September 30, 2015 11:38:50 AM Graeme Gregory wrote:
> > In ACPI this device is only defined in SBSA mode so
> > if we are probing from ACPI use this mode.
> > 
> > Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> > Cc: Len Brown <lenb@kernel.org>
> > Cc: Russell King <linux@arm.linux.org.uk>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> > ---
> >  drivers/tty/serial/amba-pl011.c | 32 +++++++++++++++++++++-----------
> >  1 file changed, 21 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> > index fd27e98..55209aa 100644
> > --- a/drivers/tty/serial/amba-pl011.c
> > +++ b/drivers/tty/serial/amba-pl011.c
> > @@ -2368,18 +2368,28 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
> >  	if (!uap)
> >  		return -ENOMEM;
> >  
> > -	uap->clk = devm_clk_get(&dev->dev, NULL);
> > -	if (IS_ERR(uap->clk))
> > -		return PTR_ERR(uap->clk);
> > -
> > -	uap->vendor = vendor;
> > -	uap->lcrh_rx = vendor->lcrh_rx;
> > -	uap->lcrh_tx = vendor->lcrh_tx;
> > -	uap->fifosize = vendor->get_fifosize(dev);
> > +	/* ACPI only defines SBSA variant */
> > +	if (!ACPI_COMPANION(&dev->dev)) {
> 
> It would read more straightforward if you did
> 
> 	if (ACPI_COMPANION(&dev->dev)) {
> 		<handle the ACPI case>
> 	} else {
> 		<handle the non-ACPI case>
> 	}
> 

This was something I debated about whether to put the ACPI case or the
common case first. I can certainly reverse it.

> > +		uap->clk = devm_clk_get(&dev->dev, NULL);
> > +		if (IS_ERR(uap->clk))
> > +			return PTR_ERR(uap->clk);
> > +
> > +		uap->vendor = vendor;
> > +		uap->lcrh_rx = vendor->lcrh_rx;
> > +		uap->lcrh_tx = vendor->lcrh_tx;
> > +		uap->fifosize = vendor->get_fifosize(dev);
> > +		uap->port.ops = &amba_pl011_pops;
> > +		snprintf(uap->type, sizeof(uap->type), "PL011 rev%u",
> > +				amba_rev(dev));
> > +	 } else {
> > +		uap->vendor	= &vendor_sbsa;
> > +		uap->fifosize	= 32;
> > +		uap->port.ops	= &sbsa_uart_pops;
> > +		uap->fixed_baud = 115200;
> > +
> > +		snprintf(uap->type, sizeof(uap->type), "SBSA");
> 
> This looks sort of heavy-handed.
> 
> Is this the only possible configuration of the device in the ACPI case?
> 

As far as I can tell yes, but ARM haven't actually published a document
to state that as fact.

This does replace the platform_probe that Russel was unhappy about for
the ACPI case.

Graeme

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#1281379

On Tuesday, December 01, 2015 12:21:00 PM Graeme Gregory wrote:
> On Tue, Dec 01, 2015 at 03:21:47AM +0100, Rafael J. Wysocki wrote:
> > On Wednesday, September 30, 2015 11:38:50 AM Graeme Gregory wrote:
> > > In ACPI this device is only defined in SBSA mode so
> > > if we are probing from ACPI use this mode.

[cut]

> > > +		uap->clk = devm_clk_get(&dev->dev, NULL);
> > > +		if (IS_ERR(uap->clk))
> > > +			return PTR_ERR(uap->clk);
> > > +
> > > +		uap->vendor = vendor;
> > > +		uap->lcrh_rx = vendor->lcrh_rx;
> > > +		uap->lcrh_tx = vendor->lcrh_tx;
> > > +		uap->fifosize = vendor->get_fifosize(dev);
> > > +		uap->port.ops = &amba_pl011_pops;
> > > +		snprintf(uap->type, sizeof(uap->type), "PL011 rev%u",
> > > +				amba_rev(dev));
> > > +	 } else {
> > > +		uap->vendor	= &vendor_sbsa;
> > > +		uap->fifosize	= 32;
> > > +		uap->port.ops	= &sbsa_uart_pops;
> > > +		uap->fixed_baud = 115200;
> > > +
> > > +		snprintf(uap->type, sizeof(uap->type), "SBSA");
> > 
> > This looks sort of heavy-handed.
> > 
> > Is this the only possible configuration of the device in the ACPI case?
> > 
> 
> As far as I can tell yes, but ARM haven't actually published a document
> to state that as fact.

At least a comment explaining what kind of information this is based on would
be useful.  Otherwise one has to wonder where this is coming from.

> This does replace the platform_probe that Russel was unhappy about for
> the ACPI case.

I can't really comment on that.

Thanks,
Rafael

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