[RFC PATCH] arm/imx6: convert clock to device tree

[Rob Herring]

On 11/21/2011 11:11 AM, Shawn Guo wrote:
> It converts imx6 clock code to common clock frame and device tree.
> 
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> ---
> As I promised to Arnd, I will convert imx6 clock code to common clock
> frame and in turn device tree.  Here it is.
> 
> It's based on Mike's common-clk pre-v3 and Grant's clock device tree
> binding series.
> 
> Along with the conversion to device tree, I feel it's a great idea to
> introduce '#clock-cells'.  With adopting it, I'm using 70 nodes to
> describe 110 clocks (~35% nodes reduced).  However, the current design
> of '#clock-cells' makes the user a little difficult.  For example, when
> a consumer node references to provider node which is a blob of 4 clocks,
> it has to fill 4 parameters into the phandle.
> 
> usdhc at 02198000 { /* uSDHC3 */
> 	compatible = "fsl,imx6q-usdhc";
> 	reg = <0x02198000 0x4000>;
> 	interrupts = <0 24 0x04>;
> 	clock-input = <&usdhc_clk 2 0 0 0>; <--
> 	clock-input-name = "usdhc3";
> };
> 
> But we actually need to pass only one parameter to point out the index
> of the clock in the blob.  It's a little silly to put a number of
> meaningless 0 there to fill the length of the phandle parameters.  Can
> we rework the dt core code to make the following one work?
> 
> usdhc at 02198000 { /* uSDHC3 */
> 	compatible = "fsl,imx6q-usdhc";
> 	reg = <0x02198000 0x4000>;
> 	interrupts = <0 24 0x04>;
> 	clock-input = <&usdhc_clk 2>; <--
> 	clock-input-name = "usdhc3";
> };

What you want is how it is supposed to work. Why do you think it is not
this way?

Rob