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From: Sascha Hauer <sha@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] clk: have clk_get always return -ENOENT on missing clock
Date: Thu, 21 Sep 2023 10:02:36 +0200	[thread overview]
Message-ID: <20230921080236.GX637806@pengutronix.de> (raw)
In-Reply-To: <20230918170458.121957-1-a.fatoum@pengutronix.de>

On Mon, Sep 18, 2023 at 07:04:58PM +0200, Ahmad Fatoum wrote:
> Currently, clk_get(dev, NULL) returns -ENOENT on missing clock, but 
> clk_get(dev, "missing-named-clock") returns -EINVAL. This went by unnoticed
> so far as most consumers either require a clock or don't, but with the
> addition of clk_get_optional, it's important that clk_get() return value
> is uniform.
> 
> Therefore align clk_get with Linux and always fall through to clk_get_sys()
> if getting clock over DT is not possible. Failing clk_get_sys() returns
> -ENOENT always, ensuring we can't end up with -EINVAL as before while
> keeping of_clk_get_by_name return value as it is under Linux.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> Please order before commit ("clk: implement clk_get_optional helper")
> currently 8b013ac8ec69 in next.
> ---
>  drivers/clk/clkdev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
> index 68c6ac36a0c8..dbe998b6af35 100644
> --- a/drivers/clk/clkdev.c
> +++ b/drivers/clk/clkdev.c
> @@ -176,9 +176,9 @@ struct clk *clk_get(struct device *dev, const char *con_id)
>  	if (!IS_ERR(clk))
>  		return clk;
>  
> -	if (dev) {
> +	if (dev && dev->of_node) {
>  		clk = of_clk_get_by_name(dev->of_node, con_id);
> -		if (!IS_ERR(clk) || PTR_ERR(clk) != -ENOENT)
> +		if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
>  			return clk;
>  	}
>  
> -- 
> 2.39.2
> 
> 
> 

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      reply	other threads:[~2023-09-21  8:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-18 17:04 Ahmad Fatoum
2023-09-21  8:02 ` Sascha Hauer [this message]

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