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Subject: Re: [PATCH 02/14] pwm: meson: use devm_clk_get_optional() to get the
 input clock
To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        linux-amlogic@lists.infradead.org, linux-pwm@vger.kernel.org,
        thierry.reding@gmail.com, u.kleine-koenig@pengutronix.de
Cc:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
References: <20190525181133.4875-1-martin.blumenstingl@googlemail.com>
 <20190525181133.4875-3-martin.blumenstingl@googlemail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <b4cfc101-7391-aef2-0f6c-8bdec2044101@baylibre.com>
Date:   Mon, 27 May 2019 14:25:25 +0200
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On 25/05/2019 20:11, Martin Blumenstingl wrote:
> Simplify the code which fetches the input clock for a PWM channel by
> using devm_clk_get_optional().
> This comes with a small functional change: previously all errors except
> EPROBE_DEFER were ignored. Now all other errors are also treated as
> errors. If no input clock is present devm_clk_get_optional() will return
> NULL instead of an error which matches the behavior of the old code.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  drivers/pwm/pwm-meson.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index 3fbbc4128ce8..35b38c7201c3 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -474,14 +474,9 @@ static int meson_pwm_init_channels(struct meson_pwm *meson,
>  
>  		snprintf(name, sizeof(name), "clkin%u", i);
>  
> -		channel->clk_parent = devm_clk_get(dev, name);
> -		if (IS_ERR(channel->clk_parent)) {
> -			err = PTR_ERR(channel->clk_parent);
> -			if (err == -EPROBE_DEFER)
> -				return err;
> -
> -			channel->clk_parent = NULL;
> -		}
> +		channel->clk_parent = devm_clk_get_optional(dev, name);
> +		if (IS_ERR(channel->clk_parent))
> +			return PTR_ERR(channel->clk_parent);
>  	}
>  
>  	return 0;
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>