linux-kernel - Re: [PATCH 19/21] regulator: fixed/gpio: Update device tree bindings

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Date:   Sun, 18 Feb 2018 20:41:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 19/21] regulator: fixed/gpio: Update device tree bindings

On Mon, Feb 12, 2018 at 02:17:15PM +0100, Linus Walleij wrote:
> Deprecate the open drain binding for fixed regulator and indicate
> that we prefer this to be passed in the GPIO phandle flags.
> 
> Clarify that the line inversion semantics for fixed and GPIO
> regulators completely overrides the active low flags in the
> phandle flags.
> 
> Unfortunately this can not be changed to prefer that we pass
> the flags in the phandle: the bindings have been specified and
> deployed such that the presence/absence of this flag and only
> that controls the line inversion semantics. The crucial semantic
> is that the absence of the flag means the core will assume
> the line is active low, which in GPIO terms is an exception,
> as GPIO lines are normally assumed to be active high.
> 
> This special device tree semantic cannot be changed without
> introducing a whole new compatible string for the fixed and
> GPIO regulators, so we just contain the situation.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  .../devicetree/bindings/regulator/fixed-regulator.txt       | 13 +++++++++++--
>  .../devicetree/bindings/regulator/gpio-regulator.txt        |  4 ++++
>  2 files changed, 15 insertions(+), 2 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>