linux-kernel - Re: [PATCH 1/2] pwm: renesas-tpu: better errno for impossible rates

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Date:   Wed, 15 Sep 2021 12:36:30 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-pwm@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Duc Nguyen <duc.nguyen.ub@...esas.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] pwm: renesas-tpu: better errno for impossible rates

On 15.09.2021 9:55, Wolfram Sang wrote:

> From: Duc Nguyen <duc.nguyen.ub@...esas.com>
> 
> ENOTSUP has confused users. EINVAL has been considered clearer. Change
> the errno, we were the only ones using ENOTSUP in this subsystem anyhow.

    It's ENOTSUPP in the code. :-)

> 
> Signed-off-by: Duc Nguyen <duc.nguyen.ub@...esas.com>
> [wsa: split and reworded commit message]
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
>   drivers/pwm/pwm-renesas-tpu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
> index 4381df90a527..754440194650 100644
> --- a/drivers/pwm/pwm-renesas-tpu.c
> +++ b/drivers/pwm/pwm-renesas-tpu.c
> @@ -269,7 +269,7 @@ static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
>   
>   	if (prescaler == ARRAY_SIZE(prescalers) || period == 0) {
>   		dev_err(&tpu->pdev->dev, "clock rate mismatch\n");
> -		return -ENOTSUPP;
> +		return -EINVAL;
>   	}
>   
>   	if (duty_ns) {

MBR, Sergei