[U-Boot] [PATCH v2] cmd: clk: Handle ENODEV from clk_get_rate

[Matthias Brugger]

On 22/02/2019 14:37, Ismael Luceno Cortes wrote:
> clk_get_rate may return -ENODEV if the clock isn't valid.
> 
> Also, make all the error cases go through a single path.
>

Not sure if that is applied systematically to u-boot, but might be good to
mention the commit you fix with that, as printing -ENODEV as clock frequency is
a bug:

Fixes: ff8eee0330 ("cmd: clk: Add trivial implementation of clock dump for DM")

Other then that:
Reviewed-by: Matthias Brugger <mbrugger at suse.com>

> Signed-off-by: Ismael Luceno <ismael.luceno at silicon-gears.com>
> ---
> 
> CC: Matthias Brugger <mbrugger at suse.com>
> 
> Notes:
>     Changes since v1:
>     
>     - Added further explanation to the commit message.
> 
>  cmd/clk.c | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/cmd/clk.c b/cmd/clk.c
> index fd4231589c..41f2ae0a50 100644
> --- a/cmd/clk.c
> +++ b/cmd/clk.c
> @@ -26,20 +26,23 @@ int __weak soc_clk_dump(void)
>  	uclass_foreach_dev(dev, uc) {
>  		memset(&clk, 0, sizeof(clk));
>  		ret = device_probe(dev);
> -		if (ret) {
> -			printf("%-30.30s : ? Hz\n", dev->name);
> -			continue;
> -		}
> +		if (ret)
> +			goto noclk;
>  
>  		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));
> +		if (ret)
> +			goto noclk;
>  
> +		ulong rate = clk_get_rate(&clk);
>  		clk_free(&clk);
> +
> +		if (rate == -ENODEV)
> +			goto noclk;
> +
> +		printf("%-30.30s : %lu Hz\n", dev->name, rate);
> +		continue;
> +	noclk:
> +		printf("%-30.30s : ? Hz\n", dev->name);
>  	}
>  
>  	return 0;
>