linux-kernel - Re: [PATCH v2 1/7] pinctrl: realtek: Add common pinctrl driver for Realtek DHC RTD SoCs

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Date:   Mon, 11 Sep 2023 10:58:58 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Tzuyi Chang <tychang@...ltek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] pinctrl: realtek: Add common pinctrl driver for
 Realtek DHC RTD SoCs

Hi Tzuyi,

thanks for the new version! This is starting to look really good.

On Thu, Aug 24, 2023 at 12:57 PM Tzuyi Chang <tychang@...ltek.com> wrote:

> The RTD SoCs share a similar design for pinmux and pinconfig.
> This common pinctrl driver supports different variants within the RTD
> SoCs.
>
> Signed-off-by: Tzuyi Chang <tychang@...ltek.com>
(...)
> +static void rtd_pinctrl_update_bits(struct rtd_pinctrl *data, unsigned int offset,
> +                                   unsigned int mask, unsigned int val)
> +{
> +       unsigned int reg = readl_relaxed(data->base + offset);
> +
> +       reg &= ~mask;
> +       reg |= (mask & val);
> +       writel_relaxed(reg, data->base + offset);
> +}

This function is essentially a reimplementation of regmap_update_bits()
using regmap_mmio with .user_relaxed_mmio property set in the
config.

Have you considered just using regmap-mmio for this?

Yours,
Linus Walleij