linux-kernel - RE: [PATCH V9 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding

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Date:   Tue, 26 Mar 2019 06:53:33 +0000
From:   Anson Huang <anson.huang@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "otavio@...ystems.com.br" <otavio@...ystems.com.br>,
        Leonard Crestez <leonard.crestez@....com>,
        Robin Gong <yibin.gong@....com>,
        "jan.tuerk@...rion.com" <jan.tuerk@...rion.com>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V9 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding

Hi, Rob

Best Regards!
Anson Huang

> -----Original Message-----
> From: Anson Huang
> Sent: 2019年3月26日 8:56
> To: 'Rob Herring' <robh@...nel.org>
> Cc: thierry.reding@...il.com; mark.rutland@....com;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; linux@...linux.org.uk; stefan@...er.ch;
> otavio@...ystems.com.br; Leonard Crestez <leonard.crestez@....com>;
> Robin Gong <yibin.gong@....com>; jan.tuerk@...rion.com; linux-
> pwm@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; u.kleine-
> koenig@...gutronix.de; dl-linux-imx <linux-imx@....com>
> Subject: RE: [PATCH V9 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding
> 
> Hi, Rob
> 
> Best Regards!
> Anson Huang
> 
> > -----Original Message-----
> > From: Rob Herring [mailto:robh@...nel.org]
> > Sent: 2019年3月26日 4:42
> > To: Anson Huang <anson.huang@....com>
> > Cc: thierry.reding@...il.com; mark.rutland@....com;
> > shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> > festevam@...il.com; linux@...linux.org.uk; stefan@...er.ch;
> > otavio@...ystems.com.br; Leonard Crestez <leonard.crestez@....com>;
> > Robin Gong <yibin.gong@....com>; jan.tuerk@...rion.com; linux-
> > pwm@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> > kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; u.kleine-
> > koenig@...gutronix.de; dl-linux-imx <linux-imx@....com>
> > Subject: Re: [PATCH V9 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding
> >
> > On Fri, Mar 22, 2019 at 01:48:05AM +0000, Anson Huang wrote:
> > > Add i.MX TPM(Low Power Timer/Pulse Width Modulation Module) PWM
> > binding.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > > ---
> > > No changes.
> >
> > v9? I don't recall seeing any previous versions.
> 
> I checked my mailbox, you are in the "to" list in every version. The first
> version's subject is:
> [PATCH 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding...
> 
> >
> > > ---
> > >  .../devicetree/bindings/pwm/imx-tpm-pwm.txt        | 22
> > ++++++++++++++++++++++
> > >  1 file changed, 22 insertions(+)
> > >  create mode 100644
> > > Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt
> > > b/Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt
> > > new file mode 100644
> > > index 0000000..94f1ad5
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt
> > > @@ -0,0 +1,22 @@
> > > +Freescale i.MX TPM PWM controller
> > > +
> > > +Required properties:
> > > +- compatible : Should be "fsl,imx-tpm".
> >
> > Needs to be SoC specific.
> 
> OK, will change it to "fsl,imx7ulp-tpm" in next verson.

As " fsl,imx7ulp-tpm " is already used for timer, TPM can work as a timer
or PWM, so I have to use " fsl,imx7ulp-pwm" in the V10 patch I just sent.

Anson.

> 
> >
> > > +- reg: Physical base address and length of the controller's registers.
> > > +- #pwm-cells: Should be 3. See pwm.txt in this directory for a
> > > +description
> > of the cells format.
> > > +- clocks : The clock provided by the SoC to drive the PWM.
> > > +- interrupts: The interrupt for the PWM controller.
> > > +
> > > +Note: The TPM counter and period counter are shared between
> > > +multiple channels, so all channels should use same period setting.
> > > +
> > > +Example:
> > > +
> > > +pwm0: tpm@...50000 {
> >
> > pwm@...
> 
> I forgot to update the example in DT binding, sorry for that, will update it
> according to below dts node:
> 
>                  pwm0: pwm@...50000 {
> 
> Anson.