[PATCH V2] clk: introduce u-boot,ignore-clk-defaults

[Sean Anderson]

On 10/28/21 9:28 PM, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan at nxp.com>
> 
> Current code has a force clk_set_defaults in multiple stages,
> U-Boot reuse the same device tree and Linux Kernel device tree,
> but we not register all the clks as Linux Kernel, so clk_set_defaults
> will fail and cause the clk provider registeration fail.
> 
> So introduce a new property to ignore the default settings which could
> be used by any node that wanna ignore default settings.
> 
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> ---
> 
> V2:
>   Add R-b tag
>   Tom, Simon
>     After a thought, I think still put it as a u-boot thing. assigned-clock-x is
>     actually Linux specific, however I could not add the new property to Linux,
>     because we are supporting SystemReady-IR, we need the assigned-clock-x property
>     in linux working and ignore it in U-Boot.
> 
>   doc/device-tree-bindings/device.txt | 3 +++
>   drivers/clk/clk-uclass.c            | 3 +++
>   2 files changed, 6 insertions(+)
> 
> diff --git a/doc/device-tree-bindings/device.txt b/doc/device-tree-bindings/device.txt
> index 73ce2a3b5b..fe34ced268 100644
> --- a/doc/device-tree-bindings/device.txt
> +++ b/doc/device-tree-bindings/device.txt
> @@ -28,6 +28,9 @@ the acpi,compatible property.
>       Linux will only load the driver if the device can be detected (e.g. on I2C
>       bus). Note that this is an out-of-tree Linux feature.
>   
> +Common device bindings that could be shared listed below:
> + - u-boot,ignore-clk-defaults : ignore the assigned-clock-parents
> +   and assigned-clock-rates for a device that has the property.
>   
>   Example
>   -------
> diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
> index 493018b33e..6bf3179e7b 100644
> --- a/drivers/clk/clk-uclass.c
> +++ b/drivers/clk/clk-uclass.c
> @@ -376,6 +376,9 @@ int clk_set_defaults(struct udevice *dev, enum clk_defaults_stage stage)
>   	if (!dev_has_ofnode(dev))
>   		return 0;
>   
> +	if (ofnode_get_property(dev_ofnode(dev), "u-boot,ignore-clk-defaults", NULL))
> +		return 0;
> +
>   	/*
>   	 * To avoid setting defaults twice, don't set them before relocation.
>   	 * However, still set them for SPL. And still set them if explicitly
> 

Reviewed-by: Sean Anderson <seanga2 at gmail.com>