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[217.229.28.220]) by smtp.gmail.com with ESMTPSA id v11sm22903550wrm.43.2020.03.30.08.40.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2020 08:40:37 -0700 (PDT) Date: Mon, 30 Mar 2020 17:40:36 +0200 From: Thierry Reding To: Clemens Gruber Cc: Matthias Schiffer , u.kleine-koenig@pengutronix.de, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com Subject: Re: [PATCH 2/4] pwm: pca9685: remove ALL_LED PWM channel Message-ID: <20200330154036.GB2817345@ulmo> References: <20200226135229.24929-1-matthias.schiffer@ew.tq-group.com> <20200226135229.24929-2-matthias.schiffer@ew.tq-group.com> <20200330130757.GC2431644@ulmo> <20200330133450.GA1530@workstation.tuxnet> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="oLBj+sq0vYjzfsbl" Content-Disposition: inline In-Reply-To: <20200330133450.GA1530@workstation.tuxnet> User-Agent: Mutt/1.13.1 (2019-12-14) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --oLBj+sq0vYjzfsbl Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 30, 2020 at 03:34:50PM +0200, Clemens Gruber wrote: > Hi, >=20 > 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. > > >=20 > > > Signed-off-by: Matthias Schiffer > > > --- > > > drivers/pwm/pwm-pca9685.c | 115 ++++++------------------------------= -- > > > 1 file changed, 17 insertions(+), 98 deletions(-) > >=20 > > Applied, thanks. > >=20 > > Thierry >=20 > I was not reading the mailing list in the last weeks, so I only saw the > patch today. >=20 > We are using the ALL_LED channel in production to reduce the delay when > all 16 PWM outputs need to be set to the same duty cycle. >=20 > I am not sure it is a good idea to remove this feature. Can you specify what platform this is and where the code is that does this. I can't really find any device tree users of this and I don't know if there's a good way to find out what other users there are, but this isn't the first time this driver has created confusion, so please help collect some more information about it's use so we can avoid this in the future. I'll back out this particular patch since you're using it. Can you give the other three patches a try to see if they work for you? 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