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

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Message-ID: <CACRpkdZXAZj5udrACxhaamhbUuHv0FM2=cqn8jsqPAznrW0+eg@mail.gmail.com>
Date:   Tue, 15 Nov 2016 10:21:10 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-sunxi <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 10:50 AM, Chen-Yu Tsai <wens@...e.org> 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>

Patch applied with Maxime's ACK.

Yours,
Linus Walleij