linux-kernel - Re: [PATCH v1 1/1] gpio: of: provide option generic property for initial line states

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Message-ID: <20170611061919.jsbc7x67ut4segj5@pengutronix.de>
Date:   Sun, 11 Jun 2017 08:19:19 +0200
From:   Oleksij Rempel <ore@...gutronix.de>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        barebox@...ts.infradead.org
Subject: Re: [PATCH v1 1/1] gpio: of: provide option generic property for
 initial line states

Hi Rob,

On Fri, Jun 09, 2017 at 10:41:30AM -0500, Rob Herring wrote:
> On Fri, Jun 9, 2017 at 9:16 AM, Oleksij Rempel <o.rempel@...gutronix.de> wrote:
> > This property is needed for barebox or may be other bootloaders
> > to set proper gpio configuration as early as possible.
> >
> > This example is mainly based on "lines-initial-states" property
> > from this binding documentation:
> > Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt
> 
> Don't we have a binding for this already based on gpio-hogs.

Markus Pargmann was working on this topic before and suddenly was not
able to finish it.
I found only some not finished discussions and no code or documentation
in linux kernel upstream.

So far, I was able to find fallowing patches and discussions:
patch 23.08.2015, last comment 11.05.2017:
https://patchwork.kernel.org/patch/7096721/

patch 23.02.2016, last comment 09.03.2016:
https://patchwork.ozlabs.org/patch/586743/

Since there was objections about node-like design for gpio-initval, I
provided an array property, which is similar to initval properties already used
for different other device nodes. For example:

Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
qcom,ath10k-calibration-data

Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt
lines-initial-states

Please fixme if I miss something.

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