linux-kernel - Re: [PATCH 2/5] dt-bindings: gpio: gpio-thunderx: Describe pin-cfg option

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Date:   Fri, 3 Jun 2022 12:35:57 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Piyush Malgujar <pmalgujar@...vell.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, brgl@...ev.pl, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, rric@...nel.org,
        cchavva@...vell.com, wsadowski@...vell.com
Subject: Re: [PATCH 2/5] dt-bindings: gpio: gpio-thunderx: Describe pin-cfg option

On Fri, Jun 3, 2022 at 11:06 AM Piyush Malgujar <pmalgujar@...vell.com> wrote:

> The purpose of this pin-cfg entry is different than the standard GPIO pin config usage.
> It is to write a value to GPIO_BIT_CFG register which is used to configure fields like
> pin function, selecting which signal is reported to GPIO output or which signal GPIO
> input need to connect, filters, XOR and output mode.

Then implement pin control for this driver instead of inventing a custom hack?
https://docs.kernel.org/driver-api/pin-control.html

Several drivers implement pin control with a GPIO front-end, for example:
drivers/gpio/gpio-pl061.c is used as a front end with
drivers/pinctrl/pinctrl-single.c

There are also composite drivers in drivers/pinctrl that implement both
pincontrol (incl muxing) and GPIO, such as drivers/pinctrl/pinctrl-sx150x.c

Yours,
Linus Walleij