linux-kernel - Re: [RFC PATCH 12/12] platform/x86/of: add support for PC Engines APU v2/3/4 boards

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Date:   Mon, 1 Mar 2021 15:55:29 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH 12/12] platform/x86/of: add support for PC Engines APU
 v2/3/4 boards

On Mon, Feb 8, 2021 at 11:22 PM Enrico Weigelt, metux IT consult
<info@...ux.net> wrote:

> +                gpio-regs = <
> +                    AMD_FCH_GPIO_REG_GPIO57 // led1
> +                    AMD_FCH_GPIO_REG_GPIO58 // led2
> +                    AMD_FCH_GPIO_REG_GPIO59_DEVSLP1 // led3
> +                    AMD_FCH_GPIO_REG_GPIO32_GE1 // modesw
> +                    AMD_FCH_GPIO_REG_GPIO33_GE2 // simawap
> +                    AMD_FCH_GPIO_REG_GPIO55_DEVSLP0 // mpcie2
> +                    AMD_FCH_GPIO_REG_GPIO51 // mpcie3
> +                >;

Please don't define registers in the DTS files. Determine the set of registers
from the compatible string and put them in the driver. If that is not possible,
the compatible string is not precise enough and needs to indicate properly
which hardware this is.

Yours,
Linus Walleij