linux-kernel - Re: [PATCH] drm/bridge: tc358767: Use devm_clk_get

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Date:   Fri, 30 Dec 2022 16:37:41 +0100
From:   Andrzej Hajda <andrzej.hajda@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/bridge: tc358767: Use devm_clk_get_enabled() helper



On 30.12.2022 16:29, Christophe JAILLET wrote:
> The devm_clk_get_enabled() helper:
>     - calls devm_clk_get()
>     - calls clk_prepare_enable() and registers what is needed in order to
>       call clk_disable_unprepare() when needed, as a managed resource.
>
> This simplifies the code and avoids the need of a dedicated function used
> with devm_add_action_or_reset().
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/gpu/drm/bridge/tc358767.c | 17 +----------------
>   1 file changed, 1 insertion(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 2a58eb271f70..b95c36ca660d 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -2022,13 +2022,6 @@ static int tc_probe_bridge_endpoint(struct tc_data *tc)
>   	return -EINVAL;
>   }
>   
> -static void tc_clk_disable(void *data)
> -{
> -	struct clk *refclk = data;
> -
> -	clk_disable_unprepare(refclk);
> -}
> -
>   static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>   {
>   	struct device *dev = &client->dev;
> @@ -2045,21 +2038,13 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>   	if (ret)
>   		return ret;
>   
> -	tc->refclk = devm_clk_get(dev, "ref");
> +	tc->refclk = devm_clk_get_enabled(dev, "ref");
>   	if (IS_ERR(tc->refclk)) {
>   		ret = PTR_ERR(tc->refclk);
>   		dev_err(dev, "Failed to get refclk: %d\n", ret);

You can adjust the message and convert to dev_err_probe.
With that:
Reviewed-by: Andrzej Hajda <andrzej.hajda@...el.com>

Regards
Andrzej


>   		return ret;
>   	}
>   
> -	ret = clk_prepare_enable(tc->refclk);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_add_action_or_reset(dev, tc_clk_disable, tc->refclk);
> -	if (ret)
> -		return ret;
> -
>   	/* tRSTW = 100 cycles , at 13 MHz that is ~7.69 us */
>   	usleep_range(10, 15);
>