From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thierry Reding Subject: Re: [PATCH 2/4] pwm: pca9685: remove ALL_LED PWM channel Date: Mon, 30 Mar 2020 17:40:36 +0200 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" Return-path: Received: from mail-wm1-f67.google.com ([209.85.128.67]:53956 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725978AbgC3Pkk (ORCPT ); Mon, 30 Mar 2020 11:40:40 -0400 Content-Disposition: inline In-Reply-To: <20200330133450.GA1530@workstation.tuxnet> Sender: linux-pwm-owner@vger.kernel.org List-Id: linux-pwm@vger.kernel.org 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 --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? Thierry --oLBj+sq0vYjzfsbl Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEiOrDCAFJzPfAjcif3SOs138+s6EFAl6CEvQACgkQ3SOs138+ s6EB/w/9FDGfvq1biq0AqLk1jc2iemdcmBqomC0BRENdlU/leyP5qoI41XFsa8Da TFYA+/4LD/3wfiT0wG9bwUxNIaywETrZgNFW/Ps2lahE/QbtDGNO05E/2hs3Lsjt 3KHzYiCpC4Bgz3prl/lHhQEfqyV2lZABA19+JG/Xn6+4iIWBn5dl2eJDpRH60Fcn AWnReeAqSs/dhsH010bpF9UVgenqTYM4/N6S5L+EsJ4MuDIpCEaHtLXTUCcnGVIS ZCi8CRXSLS1Hr1P1sXtrCri9SJyV4AjI/eWVsDL9D2JJINAO2L6Gy3PhkN9IBa+t t2OocGZ3IdrVpvgJs5g7ji0OFkbnJof67i7SrUpgZy9kFhrrc7pMdcM72jIKo7GE V6n5SZIoWuAuyX4fKh+tKDEsVJ56j6t/+JS6s/ipg5X0SZMp4+NLX1pjiU3nij6/ 3orBfvt/xt/xOqFpdp9e3m4MeiH3y06VjE77ih9uP3LXM7ZS//XCG4SVNOEn6VEd RJoJ37zawE9BiTrjmU1fhgzzJBlMoMkwff8OyTOpC+bTPldKeOxUzj7aNgjdiIkJ rgfjUPFzezEdTXd/u/PpFR5soC1c3g3y1WFumNzdCDoq04jZO2PBdu4GSrcCxuBq QGiSG4veVm1jtfo4VSaLrptJXpk5jsgg4qxhj3Encnbhq3o5Sto= =96AW -----END PGP SIGNATURE----- --oLBj+sq0vYjzfsbl--