From: Lukasz Majewski <l.majewski@majess.pl>
To: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Stefan Agner <stefan@agner.ch>,
linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org,
Fabio Estevam <fabio.estevam@nxp.com>,
Fabio Estevam <festevam@gmail.com>,
Lothar Wassmann <LW@karo-electronics.de>,
Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>,
kernel@pengutronix.de
Subject: Re: [PATCH 6/6] pwm: imx: Introduce "polarity_supported" flag to PWMv2 driver
Date: Tue, 25 Oct 2016 08:58:49 +0200 [thread overview]
Message-ID: <20161025085849.2a0225f0@jawa> (raw)
In-Reply-To: <20161025083700.342f9abe@bbrezillon>
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Hi Boris,
> Hi Lukasz,
>
> On Mon, 24 Oct 2016 23:14:58 +0200
> Lukasz Majewski <l.majewski@majess.pl> wrote:
>
> > Hi Boris,
> >
> > > On Mon, 24 Oct 2016 17:28:52 +0200
> > > Boris Brezillon <boris.brezillon@free-electrons.com> wrote:
> > >
> > > > On Sun, 23 Oct 2016 23:45:46 +0200
> > > > Lukasz Majewski <l.majewski@majess.pl> wrote:
> > > >
> > > > > The need for set_polarity() function has been removed by
> > > > > implementing PWM atomic support (apply() callback).
> > > > >
> > > > > To indicate that the PWMv2 supports polarity inversion, new
> > > > > flag - "polarity_supported" has been introduced.
> > > > >
> > > > > Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
> > > > > ---
> > > > > drivers/pwm/pwm-imx.c | 4 +++-
> > > > > 1 file changed, 3 insertions(+), 1 deletion(-)
> > > > >
> > > > > diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> > > > > index 02d3dfd..be3034d 100644
> > > > > --- a/drivers/pwm/pwm-imx.c
> > > > > +++ b/drivers/pwm/pwm-imx.c
> > > > > @@ -258,6 +258,7 @@ static struct pwm_ops imx_pwm_ops_v2 = {
> > > > > };
> > > > >
> > > > > struct imx_pwm_data {
> > > > > + bool polarity_supported;
> > > > > struct pwm_ops *pwm_ops;
> > > > > };
> > > > >
> > > > > @@ -266,6 +267,7 @@ static struct imx_pwm_data
> > > > > imx_pwm_data_v1 = { };
> > > > >
> > > > > static struct imx_pwm_data imx_pwm_data_v2 = {
> > > > > + .polarity_supported = true,
> > > > > .pwm_ops = &imx_pwm_ops_v2,
> > > > > };
> > > > >
> > > > > @@ -313,7 +315,7 @@ static int imx_pwm_probe(struct
> > > > > platform_device *pdev) imx->chip.base = -1;
> > > > > imx->chip.npwm = 1;
> > > > > imx->chip.can_sleep = true;
> > > > > - if (data->pwm_ops->set_polarity) {
> > > > > + if (data->polarity_supported) {
> > > >
> > > > You're still breaking backward compatibility with DTs defining
> > > > #pwm-cells = 2.
> > > >
> > > > Please test the #pwm-cells value before deciding which of_xlate
> > > > should be used.
> > >
> > > Nevermind, I didn't look at [1] and [2].
> >
> > Yes, some patches are required to make this code work. Especially, I
> > wanted to explicitly reuse and credit work already done by
> > Bhuvanchandra.
> >
> > > But still, your series is not bisectable: this change should be
> > > part of patch 5 where you remove the ->set_polarity
> > > implementation. Otherwise, this means you don't support polarity
> > > setting between patch 5 and 6.
> >
> > Frankly speaking, I did it on purpose, to have operations in commits
> > logically separated.
> >
> > I personally, do detest commits which blur the picture and are not
> > corresponding to one single logical change - for example remove some
> > large chunk of code and also add some tiny, new flag.
> >
> > For me it is not a problem to have polarity disabled between
> > patches 5 and 6, since at the end of the day we have it enabled.
>
> It's really simple to make this series bisectable, all you have to do
> is move patch 6 before patch 5.
Hmm... You are right, I do wonder why I didn't get this idea from the
very beginning.
> This being said, I really think you
> should follow Stefan's recommendation: base your changes on mainline
> and switch to the atomic hook before supporting polarity setting.
I will do my best :-)
Best regards,
Łukasz Majewski
>
> Regards,
>
> Boris
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next prev parent reply other threads:[~2016-10-25 6:59 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-23 21:45 [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Lukasz Majewski
2016-10-23 21:45 ` [PATCH 1/6] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-10-24 15:21 ` Boris Brezillon
2016-10-25 5:54 ` Sascha Hauer
2016-10-25 6:27 ` Boris Brezillon
2016-10-25 6:32 ` Sascha Hauer
2016-10-25 6:42 ` Boris Brezillon
2016-10-25 6:55 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 2/6] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-24 21:02 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 3/6] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 4/6] pwm: imx: Provide atomic PWM support for IMXv2 PWM Lukasz Majewski
2016-10-24 15:25 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 5/6] pwm: imx: Remove redundant IMX PWMv2 code Lukasz Majewski
2016-10-24 15:27 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 6/6] pwm: imx: Introduce "polarity_supported" flag to PWMv2 driver Lukasz Majewski
2016-10-24 15:28 ` Boris Brezillon
2016-10-24 15:34 ` Boris Brezillon
2016-10-24 21:14 ` Lukasz Majewski
2016-10-25 6:37 ` Boris Brezillon
2016-10-25 6:58 ` Lukasz Majewski [this message]
2016-10-24 15:36 ` [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Boris Brezillon
2016-10-24 21:26 ` Lukasz Majewski
2016-10-25 3:41 ` Stefan Agner
2016-10-25 7:07 ` Lukasz Majewski
2016-10-25 17:08 ` Fabio Estevam
2016-10-25 17:09 ` Fabio Estevam
2016-10-27 5:59 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 00/11] " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 01/11] pwm: print error messages with pr_err() instead of pr_debug() Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 02/11] pwm: imx: remove ipg clock Lukasz Majewski
2016-12-27 7:26 ` Stefan Agner
2016-12-27 7:54 ` Lukasz Majewski
2016-12-28 22:01 ` Lukasz Majewski
2016-12-29 7:22 ` Stefan Agner
2016-12-29 10:06 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 03/11] pwm: imx: Add separate set of pwm ops for PWMv1 and PWMv2 Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 05/11] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 06/11] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 07/11] pwm: imx: Provide atomic PWM support for i.MX PWMv2 Lukasz Majewski
2016-12-29 16:21 ` Boris Brezillon
2016-12-29 16:45 ` Lukasz Majewski
2016-12-29 17:08 ` Boris Brezillon
2017-01-03 11:43 ` Lukasz Majewski
2017-01-03 12:46 ` Boris Brezillon
2017-01-03 17:29 ` Stefan Agner
2017-01-03 19:35 ` Boris Brezillon
2017-01-03 22:01 ` Lukasz Majewski
2017-01-03 22:18 ` Boris Brezillon
2017-01-03 22:46 ` Lukasz Majewski
2017-01-03 23:34 ` Boris Brezillon
2017-01-04 11:29 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 08/11] pwm: imx: Remove redundant i.MX PWMv2 code Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 09/11] pwm: core: make the PWM_POLARITY flag in DTB optional Lukasz Majewski
2016-12-26 22:56 ` [PATCH v3 RESEND 10/11] pwm: imx: doc: Update imx-pwm.txt documentation entry Lukasz Majewski
2016-12-26 22:56 ` [PATCH v3 RESEND 11/11] pwm: imx: Add polarity inversion support to i.MX's PWMv2 Lukasz Majewski
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