linux-kernel - Re: [PATCH v3 2/3] pinctrl: sunxi: Add support for fetching pinconf settings from hardware

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Date:   Fri, 11 Nov 2016 14:51:59 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 2/3] pinctrl: sunxi: Add support for fetching pinconf
 settings from hardware

On Fri, Nov 11, 2016 at 05:50:35PM +0800, Chen-Yu Tsai wrote:
> The sunxi pinctrl driver only caches whatever pinconf setting was last
> set on a given pingroup. This is not particularly helpful, nor is it
> correct.
> 
> Fix this by actually reading the hardware registers and returning
> the correct results or error codes. Also filter out unsupported
> pinconf settings. Since this driver has a peculiar setup of 1 pin
> per group, we can support both pin and pingroup pinconf setting
> read back with the same code. The sunxi_pconf_reg helper and code
> structure is inspired by pinctrl-msm.
> 
> With this done we can also claim to support generic pinconf, by
> setting .is_generic = true in pinconf_ops.
> 
> Also remove the cached config value. The behavior of this was never
> correct, as it only cached 1 setting instead of all of them. Since
> we can now read back settings directly from the hardware, it is no
> longer required.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/pinctrl/sunxi/pinctrl-sunxi.c | 86 +++++++++++++++++++++++++++++++++--
>  drivers/pinctrl/sunxi/pinctrl-sunxi.h |  1 -
>  2 files changed, 81 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> index e04edda8629d..ed71bff39869 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> @@ -438,15 +438,91 @@ static const struct pinctrl_ops sunxi_pctrl_ops = {
>  	.get_group_pins		= sunxi_pctrl_get_group_pins,
>  };
>  
> +static int sunxi_pconf_reg(unsigned pin, enum pin_config_param param,

Sorry, this went unnoticed in your previous version, but checkpatch
reports:

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'

For this one and the next function.

Once fixed,
Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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