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SubjectRe: [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@xilinx.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
>

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