[U-Boot] [RFC][PATCH] cmd: clk: Add trivial implementation of clock dump for DM

[Ley Foon Tan <ley.foon.tan@intel.com>]

On Wed, 2018-08-08 at 22:10 +0200, Marek Vasut wrote:
> Add trivial implementation of the clk dump in case DM is enabled.
> This implementation just iterates over all the clock registered
> with the CLK uclass and prints their rate.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Chin Liang See <chin.liang.see@intel.com>
> Cc: Dinh Nguyen <dinguyen@kernel.org>
> Cc: Ley Foon Tan <ley.foon.tan@intel.com>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Tom Rini <trini@konsulko.com>
> ---
>  cmd/clk.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/cmd/clk.c b/cmd/clk.c
> index 73fb25092b..fd4231589c 100644
> --- a/cmd/clk.c
> +++ b/cmd/clk.c
> @@ -5,11 +5,48 @@
>  #include <common.h>
>  #include <command.h>
>  #include <clk.h>
> +#if defined(CONFIG_DM) && defined(CONFIG_CLK)
> +#include <dm.h>
> +#include <dm/device-internal.h>
> +#endif
>  
>  int __weak soc_clk_dump(void)
>  {
> +#if defined(CONFIG_DM) && defined(CONFIG_CLK)
> +	struct udevice *dev;
> +	struct uclass *uc;
> +	struct clk clk;
> +	int ret;
> +
> +	/* Device addresses start at 1 */
> +	ret = uclass_get(UCLASS_CLK, &uc);
> +	if (ret)
> +		return ret;
> +
> +	uclass_foreach_dev(dev, uc) {
> +		memset(&clk, 0, sizeof(clk));
> +		ret = device_probe(dev);
> +		if (ret) {
> +			printf("%-30.30s : ? Hz\n", dev->name);
> +			continue;
> +		}
> +
> +		ret = clk_request(dev, &clk);
> +		if (ret) {
> +			printf("%-30.30s : ? Hz\n", dev->name);
> +			continue;
> +		}
> +
> +		printf("%-30.30s : %lu Hz\n", dev->name,
> clk_get_rate(&clk));
> +
> +		clk_free(&clk);
> +	}
> +
> +	return 0;
> +#else
>  	puts("Not implemented\n");
>  	return 1;
> +#endif
>  }
>  
>  static int do_clk_dump(cmd_tbl_t *cmdtp, int flag, int argc,

Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>