linux-kernel - Re: [PATCH 2/4] pwm: pca9685: remove ALL

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Date:   Mon, 30 Mar 2020 15:15:57 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     u.kleine-koenig@...gutronix.de, linux-pwm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] pwm: pca9685: remove ALL_LED PWM channel

On Mon, Mar 30, 2020 at 03:07:57PM +0200, Thierry Reding wrote:
> On Wed, Feb 26, 2020 at 02:52:27PM +0100, Matthias Schiffer wrote:
> > The interaction of the ALL_LED PWM channel with the other channels was
> > not well-defined. As the ALL_LED feature does not seem very useful and
> > it was making the code significantly more complex, simply remove it.
> > 
> > Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> > ---
> >  drivers/pwm/pwm-pca9685.c | 115 ++++++--------------------------------
> >  1 file changed, 17 insertions(+), 98 deletions(-)
> 
> Applied, thanks.

By the way, shouldn't we add something like this:

--- >8 ---
diff --git a/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt b/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt
index f21b55c95738..49fff008af09 100644
--- a/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt
@@ -5,8 +5,6 @@ Required properties:
   - compatible: "nxp,pca9685-pwm"
   - #pwm-cells: Should be 2. See pwm.yaml in this directory for a description of
     the cells format.
-    The index 16 is the ALLCALL channel, that sets all PWM channels at the same
-    time.

 Optional properties:
   - invert (bool): boolean to enable inverted logic
--- >8 ---

To make sure we reflect this in the device tree bindings? It doesn't
seem like anyone uses that channel (in fact, it doesn't seem like any
device trees actually exist in-tree that use one of these chips), so it
should be fine to drop that.

Thierry

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