Re: [PATCH v1 1/3] pinctrl: th1520: Fix pinconf return values

From: Drew Fustini <dfustini@tenstorrent.com>
To: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
	devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Jisheng Zhang <jszhang@kernel.org>, Guo Ren <guoren@kernel.org>,
	Fu Wei <wefu@redhat.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Thomas Bonnefille <thomas.bonnefille@bootlin.com>
Subject: Re: [PATCH v1 1/3] pinctrl: th1520: Fix pinconf return values
Date: Fri, 11 Oct 2024 08:29:38 -0700	[thread overview]
Message-ID: <ZwlEYi/AFCTWVOl5@x1> (raw)
In-Reply-To: <20241011144826.381104-2-emil.renner.berthing@canonical.com>

On Fri, Oct 11, 2024 at 04:48:23PM +0200, Emil Renner Berthing wrote:
> When Drew took over the pinctrl driver he must have changed
> all the -ENOTSUPP returns into -EOPNOTSUPP. This subtle change
> was most likely not spotted because it was never mentioned in the
> changelog of the patchset, but it breaks all the places in the
> pin control and GPIO frameworks where -ENOTSUPP is expected.
> 
> Fixes: bed5cd6f8a98 ("pinctrl: Add driver for the T-Head TH1520 SoC")
> Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
> ---
>  drivers/pinctrl/pinctrl-th1520.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-th1520.c b/drivers/pinctrl/pinctrl-th1520.c
> index c8d2ee6defa7..03326df69668 100644
> --- a/drivers/pinctrl/pinctrl-th1520.c
> +++ b/drivers/pinctrl/pinctrl-th1520.c
> @@ -591,7 +591,7 @@ static int th1520_pinconf_get(struct pinctrl_dev *pctldev,
>  	u32 arg;
>  
>  	if ((uintptr_t)desc->drv_data & TH1520_PAD_NO_PADCFG)
> -		return -EOPNOTSUPP;
> +		return -ENOTSUPP;
>  
>  	value = readl_relaxed(th1520_padcfg(thp, pin));
>  	value = (value >> th1520_padcfg_shift(pin)) & GENMASK(9, 0);
> @@ -636,7 +636,7 @@ static int th1520_pinconf_get(struct pinctrl_dev *pctldev,
>  		arg = enabled ? 1 : 0;
>  		break;
>  	default:
> -		return -EOPNOTSUPP;
> +		return -ENOTSUPP;
>  	}
>  
>  	*config = pinconf_to_config_packed(param, arg);
> @@ -661,7 +661,7 @@ static int th1520_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>  	u16 mask, value;
>  
>  	if ((uintptr_t)desc->drv_data & TH1520_PAD_NO_PADCFG)
> -		return -EOPNOTSUPP;
> +		return -ENOTSUPP;
>  
>  	mask = 0;
>  	value = 0;
> @@ -676,14 +676,14 @@ static int th1520_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>  			break;
>  		case PIN_CONFIG_BIAS_PULL_DOWN:
>  			if (arg == 0)
> -				return -EOPNOTSUPP;
> +				return -ENOTSUPP;
>  			mask |= TH1520_PADCFG_BIAS;
>  			value &= ~TH1520_PADCFG_BIAS;
>  			value |= TH1520_PADCFG_PE;
>  			break;
>  		case PIN_CONFIG_BIAS_PULL_UP:
>  			if (arg == 0)
> -				return -EOPNOTSUPP;
> +				return -ENOTSUPP;
>  			mask |= TH1520_PADCFG_BIAS;
>  			value &= ~TH1520_PADCFG_BIAS;
>  			if (arg == TH1520_PULL_STRONG_OHM)
> @@ -718,7 +718,7 @@ static int th1520_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>  				value &= ~TH1520_PADCFG_SL;
>  			break;
>  		default:
> -			return -EOPNOTSUPP;
> +			return -ENOTSUPP;
>  		}
>  	}
>  
> -- 
> 2.43.0
> 

Reviewed-by: Drew Fustini <dfustini@tenstorrent.com>

Thanks for the fix. This was something I changed due to checkpatch
("ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP") wihtout
realizing the implication.

-Drew