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Re: [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock

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On Tue, Jun 07, 2016 at 03:44:39PM -0700, Douglas Anderson wrote:
> Some SD/eMMC PHYs (like the PHY from Arasan that is designed to work
> with arasan,sdhci-5.1) need to know the card clock in order to function
> properly.  Let's expose this clock using a standard device tree
> mechanism so that the PHY can get access to and query the card clock.

Need to know the clock freq or need the clock? The former doesn't need 
to be in DT.

> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index b67e623ca1ff..074d03e630ec 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -30,6 +30,12 @@ Optional Properties:
>    - arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
>      used to access core corecfg registers.  Offsets of registers in this
>      syscon are determined based on the main compatible string for the device.
> +  - clock-output-names: If specified, this will be the name of the card clock
> +    which will be exposed by this device.  Required if #clock-cells is
> +    specified.
> +  - #clock-cells: If specified this should be the value <0>.  With this property
> +    in place we will export a clock representing the Card Clock.  This clock
> +    is expected to be consumed by our PHY.  You must also specify
>  
>  Example:
>  	sdhci@e0100000 {
> @@ -61,7 +67,9 @@ Example:
>  		arasan,soc-ctl-syscon = <&grf>;
>  		assigned-clocks = <&cru SCLK_EMMC>;
>  		assigned-clock-rates = <200000000>;
> +		clock-output-names = "emmc_cardclock";
>  		phys = <&emmc_phy>;
>  		phy-names = "phy_arasan";
> +		#clock-cells = <0>;
>  		status = "disabled";
>  	};
> -- 
> 2.8.0.rc3.226.g39d4020
> 

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[PATCH 0/11] Changes to support 150 MHz eMMC on rk3399 Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to export card clock Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
    Re: [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability  to export card clock Rob Herring <robh@kernel.org> - 2016-06-08 22:20 +0200
      Re: [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability to  export card clock Doug Anderson <dianders@chromium.org> - 2016-06-08 23:00 +0200
        Re: [PATCH 06/11] Documentation: mmc: sdhci-of-arasan: Add ability  to export card clock Rob Herring <robh@kernel.org> - 2016-06-10 15:20 +0200
  [PATCH 05/11] arm64: dts: rockchip: Add soc-ctl-syscon to sdhci for rk3399 Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 01/11] phy: rockchip-emmc: Increase lock time allowance Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 10/11] phy: rockchip-emmc: Minor code cleanup in rockchip_emmc_phy_power_off() Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 09/11] phy: rockchip-emmc: Set phyctrl_frqsel based on card clock Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 04/11] mmc: sdhci-of-arasan: Properly set corecfg_baseclkfreq on rk3399 Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
  [PATCH 08/11] Documentation: phy: Let the rockchip eMMC PHY get an exported card clock Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200
    Re: [PATCH 08/11] Documentation: phy: Let the rockchip eMMC PHY get  an exported card clock Rob Herring <robh@kernel.org> - 2016-06-10 15:40 +0200
  [PATCH 07/11] mmc: sdhci-of-arasan: Add ability to export card clock Douglas Anderson <dianders@chromium.org> - 2016-06-08 00:50 +0200

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