linux-kernel - Re: [PATCH v2 01/11] dt-bindings: mmc: arasan: Update documentation for SD Card Clock

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Date:   Mon, 22 Jul 2019 15:54:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     ulf.hansson@...aro.org, mark.rutland@....com, heiko@...ech.de,
        michal.simek@...inx.com, adrian.hunter@...el.com,
        christoph.muellner@...obroma-systems.com,
        philipp.tomsich@...obroma-systems.com, viresh.kumar@...aro.org,
        scott.branden@...adcom.com, ayaka@...lik.info, kernel@...il.dk,
        tony.xie@...k-chips.com, rajan.vaja@...inx.com,
        jolly.shah@...inx.com, nava.manne@...inx.com, mdf@...nel.org,
        olof@...om.net, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 01/11] dt-bindings: mmc: arasan: Update documentation
 for SD Card Clock

On Mon, Jul 01, 2019 at 10:59:41AM +0530, Manish Narani wrote:
> The clock handling is to be updated in the Arasan SDHCI. As the
> 'devm_clk_register' is deprecated in the clock framework, this needs to
> specify one more clock named 'clk_sdcard' to get the clock in the driver
> via 'devm_clk_get()'. This clock represents the clock from controller to
> the card.

Please explain why in terms of the binding, not some driver calls.

 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index 1edbb04..15c6397 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -23,6 +23,10 @@ Required Properties:
>    - reg: From mmc bindings: Register location and length.
>    - clocks: From clock bindings: Handles to clock inputs.
>    - clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
> +		 Apart from these two there is one more optional clock which
> +		 is "clk_sdcard". This clock represents output clock from
> +		 controller and card. This must be specified when #clock-cells
> +		 is specified.
>    - interrupts: Interrupt specifier
>  
>  Required Properties for "arasan,sdhci-5.1":
> @@ -36,9 +40,10 @@ Optional Properties:
>    - 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
> +  - #clock-cells: If specified this should be the value <0>. With this
> +    property in place we will export one clock representing the Card
> +    Clock. This clock is expected to be consumed by our PHY. You must also
> +    specify

specify what?

The 3rd clock input I assume? This statement means any existing users 
with 2 clock inputs and #clock-cells are in error now. Is that correct? 

>    - xlnx,fails-without-test-cd: when present, the controller doesn't work when
>      the CD line is not connected properly, and the line is not connected
>      properly. Test mode can be used to force the controller to function.
> @@ -70,8 +75,8 @@ Example:
>  		compatible = "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1";
>  		reg = <0x0 0xfe330000 0x0 0x10000>;
>  		interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> -		clocks = <&cru SCLK_EMMC>, <&cru ACLK_EMMC>;
> -		clock-names = "clk_xin", "clk_ahb";
> +		clocks = <&cru SCLK_EMMC>, <&cru ACLK_EMMC>, <&sdhci 0>;
> +		clock-names = "clk_xin", "clk_ahb", "clk_sdcard";
>  		arasan,soc-ctl-syscon = <&grf>;
>  		assigned-clocks = <&cru SCLK_EMMC>;
>  		assigned-clock-rates = <200000000>;
> -- 
> 2.1.1
>