linux-kernel - Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI system

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Date:   Mon, 12 Apr 2021 19:59:05 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Henning Schild <henning.schild@...mens.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.de>,
        Lee Jones <lee.jones@...aro.org>,
        Tan Jui Nee <jui.nee.tan@...el.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Jonathan Yong <jonathan.yong@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Peter Tyser <ptyser@...-inc.com>, hdegoede@...hat.com
Subject: Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI
 system

On Mon, Apr 12, 2021 at 06:40:01PM +0200, Henning Schild wrote:
> Tan or Andy,
> 
> maybe you can point me to a user of that patch. I guess there might be
> an out-of-tree driver or userland code on how to use the GPIOs from
> there.

I'm confused. User of this patch is pinctrl-broxton driver.
It's in upstream.

Using GPIOs from it is something as done in a few drivers already
(Assuming we have no resources described in the ACPI). I.e. you need to
register in board file the GPIO mapping table with help of
devm_acpi_dev_add_driver_gpios() and use one of gpiod_get() family of functions
to request it.

In case of LEDs you simple describe GPIO device name in lookup table and
that's it. The drivers/platform/x86/pcengines-apuv2.c not the best but
will give you an idea how to use "leds-gpio" driver in board files.

> Feel free to send directly to me in case it is not published anywhere
> and should not yet be on the list, i could just use it for inspiration.
> A driver will likely be GPL anyways.

-- 
With Best Regards,
Andy Shevchenko