linux-kernel - Re: [PATCH v6 07/10] hda: cs35l41: Add support for CS35L41 in HDA systems

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Message-ID: <CAHp75Vc_Y+1SRryQn+=qpGqfNpRYS7ymGL+RifHdOwKcwsmF-Q@mail.gmail.com>
Date:   Thu, 13 Jan 2022 20:19:40 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lucas tanure <tanureal@...nsource.cirrus.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        patches@...nsource.cirrus.com,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 07/10] hda: cs35l41: Add support for CS35L41 in HDA systems

On Thu, Jan 13, 2022 at 8:13 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Thu, Jan 13, 2022 at 6:53 PM Lucas tanure
> <tanureal@...nsource.cirrus.com> wrote:
> > On 1/6/22 12:29, Andy Shevchenko wrote:
> > > On Fri, Dec 17, 2021 at 5:45 PM Lucas Tanure
> > > <tanureal@...nsource.cirrus.com> wrote:

...

> > >> +        * Device CLSA0100 doesn't have _DSD so a gpiod_get by the label reset won't work.
> > >
> > > So, you need to add mapping tables and switch to regular APIs, tell
> > > me, why it won't work.

> > The part about how the driver access the ACPI table is going to be
> > improved later if possible.
> > The laptop has already shipped and doesn't have a _DSD node, so the
> > driver needs to read the reset GPIO from a hard coded index inside a
> > node that contains more than one cs35l41.
>
> We have a lot of cases like this, hint: `git grep -n -w
> devm_acpi_dev_add_driver_gpios`.

It's all described here: Documentation/firmware-guide/acpi/gpio-properties.rst

-- 
With Best Regards,
Andy Shevchenko