Hi, Stefan Best Regards! Anson Huang > -----Original Message----- > From: Stefan Agner [mailto:stefan@xxxxxxxx] > Sent: 2019年3月18日 16:19 > To: Anson Huang <anson.huang@xxxxxxx> > Cc: thierry.reding@xxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; > shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; > festevam@xxxxxxxxx; linux@xxxxxxxxxxxxxxx; otavio@xxxxxxxxxxxxxxxx; > Leonard Crestez <leonard.crestez@xxxxxxx>; Robin Gong > <yibin.gong@xxxxxxx>; jan.tuerk@xxxxxxxxxxx; linux- > pwm@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; u.kleine- > koenig@xxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx> > Subject: Re: [PATCH V5 1/5] dt-bindings: pwm: Add i.MX TPM PWM binding > > On 18.03.2019 08:41, Anson Huang wrote: > > Add i.MX TPM(Low Power Timer/Pulse Width Modulation Module) PWM > binding. > > > > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> > > --- > > No changes. > > --- > > Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt | 19 > > +++++++++++++++++++ > > 1 file changed, 19 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..d47b8fb > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/pwm/imx-tpm-pwm.txt > > @@ -0,0 +1,19 @@ > > +Freescale i.MX TPM PWM controller > > + > > +Required properties: > > +- compatible : Should be "fsl,imx-tpm-pwm". > > +- reg: Physical base address and length of the controller's registers. > > +- #pwm-cells: Should be 2. See pwm.txt in this directory for a > > description of the cells format. > > It seems that the driver supports polarity. Can we use 3 cells so we can > specify the polarity in the device tree? > > Also use 3 cells in the base device tree to enable other boards making use of > the polarity (arch/arm/boot/dts/imx7ulp.dtsi). It makes sense, I will change it to 3 cells and specify the polarity in backlight node. Anson. > > -- > Stefan > > > +- clocks : The clock provided by the SoC to drive the PWM. > > +- interrupts: The interrupt for the pwm controller. > > + > > +Example: > > + > > +pwm0: tpm@40250000 { > > + compatible = "fsl,imx-tpm-pwm"; > > + reg = <0x40250000 0x1000>; > > + assigned-clocks = <&clks IMX7ULP_CLK_LPTPM4>; > > + assigned-clock-parents = <&clks IMX7ULP_CLK_SOSC_BUS_CLK>; > > + clocks = <&clks IMX7ULP_CLK_LPTPM4>; > > + #pwm-cells = <2>; > > +};
