On 18 January 2017 at 18:25, Chris Brandt <chris.brandt@xxxxxxxxxxx> wrote:
> In the case of a single clock source, you don't need names. However,
> if the controller has 2 clock sources, you need to name them correctly
> so the driver can find the 2nd one.
>
> Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
> ---
> v2:
> * fix spelling and change wording
> * changed clock name from "carddetect" to "cd"
> ---
> Documentation/devicetree/bindings/mmc/tmio_mmc.txt | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> index a1650ed..90370cd 100644
> --- a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
> @@ -25,8 +25,29 @@ Required properties:
> "renesas,sdhi-r8a7795" - SDHI IP on R8A7795 SoC
> "renesas,sdhi-r8a7796" - SDHI IP on R8A7796 SoC
>
> +- clocks: Most controllers only have 1 clock source per channel. However, some
> + have a second clock dedicated to card detection. If 2 clocks are
> + specified, you must name them as "core" and "cd". If the controller
> + only has 1 clock, naming is not required.
Could you please elaborate a bit on the card detection clock?
I guess that there is some kind of internal card detection logic
(native card detect) in the SDHI IP, which requires a separate clock
for it to work? Perhaps you can state that somehow?
> +
> Optional properties:
> - toshiba,mmc-wrprotect-disable: write-protect detection is unavailable
> - pinctrl-names: should be "default", "state_uhs"
> - pinctrl-0: should contain default/high speed pin ctrl
> - pinctrl-1: should contain uhs mode pin ctrl
> +
> +Example showing 2 clocks:
> + sdhi0: sd@e804e000 {
> + compatible = "renesas,sdhi-r7s72100";
> + reg = <0xe804e000 0x100>;
> + interrupts = <GIC_SPI 270 IRQ_TYPE_LEVEL_HIGH
> + GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH
> + GIC_SPI 272 IRQ_TYPE_LEVEL_HIGH>;
> +
> + clocks = <&mstp12_clks R7S72100_CLK_SDHI00>,
> + <&mstp12_clks R7S72100_CLK_SDHI01>;
> + clock-names = "core", "cd";
> + cap-sd-highspeed;
> + cap-sdio-irq;
> + status = "disabled";
The last line seems a bit odd to include in an example.
> + };
> --
> 2.10.1
>
>
Kind regards
Uffe
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