[PATCH] ARM: socfpga: dts: Add a ciu clock node for sdmmc

[Steffen Trumtrar]

Hi!

dinguyen at opensource.altera.com writes:
> From: Dinh Nguyen <dinguyen at opensource.altera.com>
>
> The CIU(Card Interface Unit) clock is used by the dw_mmc IP to clock an SD
> card. The ciu_clk is the sdmmc_clk passed through a fixed divider of 4. This patch
> adds the ciu_clk node and makes the sdmmc_clk it's parent.
>
> Signed-off-by: Dinh Nguyen <dinguyen at opensource.altera.com>
> ---
>  arch/arm/boot/dts/socfpga.dtsi | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> index d9176e6..25418ee 100644
> --- a/arch/arm/boot/dts/socfpga.dtsi
> +++ b/arch/arm/boot/dts/socfpga.dtsi
> @@ -451,6 +451,14 @@
>  						clk-phase = <0 135>;
>  					};
>  
> +					ciu_clk: ciu_clk {
> +						#clock-cells = <0>;
> +						compatible = "altr,socfpga-gate-clk";
> +						clocks = <&sdmmc_clk>;
> +						clk-gate = <0xa0 8>;
> +						fixed-divider = <4>;
> +					};
> +

Hm, is this correct? The clk-gate at 0xa0 is for the SDMMC_CLK, no?
Also, maybe the clock should be named "sdmmc_clk_divided" like in the
datasheet, so it is easier to find.

>  					nand_x_clk: nand_x_clk {
>  						#clock-cells = <0>;
>  						compatible = "altr,socfpga-gate-clk";
> @@ -635,7 +643,7 @@
>  			fifo-depth = <0x400>;
>  			#address-cells = <1>;
>  			#size-cells = <0>;
> -			clocks = <&l4_mp_clk>, <&sdmmc_clk>;
> +			clocks = <&l4_mp_clk>, <&ciu_clk>;
>  			clock-names = "biu", "ciu";
>  		};
>  

Regards,
Steffen

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