RE: [PATCH v3 3/8] arm64: dts: ls1028a: add flextimer based pwm nodes

[Leo Li]

> -----Original Message-----
> From: Vladimir Oltean <olteanv@xxxxxxxxx>
> Sent: Wednesday, April 13, 2022 11:33 AM
> To: Leo Li <leoyang.li@xxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Biwen Li
> <biwen.li@xxxxxxx>
> Subject: Re: [PATCH v3 3/8] arm64: dts: ls1028a: add flextimer based pwm
> nodes
> 
> On Tue, Dec 14, 2021 at 03:32:35AM -0600, Li Yang wrote:
> > From: Biwen Li <biwen.li@xxxxxxx>
> >
> > Add pwm nodes using flextimer controller.
> >
> > Signed-off-by: Biwen Li <biwen.li@xxxxxxx>
> > Signed-off-by: Li Yang <leoyang.li@xxxxxxx>
> > ---
> >  .../arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 95 +++++++++++++++++++
> >  1 file changed, 95 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > index f2564faf7067..5a7b26a1bad2 100644
> > --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > @@ -66,6 +66,13 @@ CPU_PW20: cpu-pw20 {
> >  		};
> >  	};
> >
> > +	rtc_clk: rtc-clk {
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <32768>;
> > +		clock-output-names = "rtc_clk";
> > +	};
> > +
> >  	sysclk: sysclk {
> >  		compatible = "fixed-clock";
> >  		#clock-cells = <0>;
> > @@ -1186,6 +1193,94 @@ ierb@1f0800000 {
> >  			reg = <0x01 0xf0800000 0x0 0x10000>;
> >  		};
> >
> > +		pwm0: pwm@2800000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2800000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm1: pwm@2810000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2810000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm2: pwm@2820000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2820000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm3: pwm@2830000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2830000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm4: pwm@2840000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2840000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm5: pwm@2850000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2850000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm6: pwm@2860000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2860000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> > +		pwm7: pwm@2870000 {
> > +			compatible = "fsl,vf610-ftm-pwm";
> > +			#pwm-cells = <3>;
> > +			reg = <0x0 0x2870000 0x0 0x10000>;
> > +			clock-names = "ftm_sys", "ftm_ext",
> > +				      "ftm_fix", "ftm_cnt_clk_en";
> > +			clocks = <&clockgen 4 1>, <&clockgen 4 1>,
> > +				 <&rtc_clk>, <&clockgen 4 1>;
> > +			status = "disabled";
> > +		};
> > +
> >  		rcpm: power-controller@1e34040 {
> >  			compatible = "fsl,ls1028a-rcpm", "fsl,qoriq-rcpm-
> 2.1+";
> >  			reg = <0x0 0x1e34040 0x0 0x1c>;
> > --
> > 2.25.1
> >
> 
> arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi:1210.21-1219.5: Warning
> (unique_unit_address): /soc/pwm@2800000: duplicate unit-address (also
> used in node /soc/timer@2800000)
> arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi:1221.21-1230.5: Warning
> (unique_unit_address): /soc/pwm@2810000: duplicate unit-address (also
> used in node /soc/timer@2810000)

Well, this is similar situation as pcie.  The flextimer controller can be used as timer, PWM or alarm.  We have separate drivers and bindings for these modes which resulted in different nodes for the same controller.

Regards,
Leo