| Message ID | 6eba6c10-9c96-b40f-937a-e02d43b04cd7@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [RFC,v1,1/2] dt-bindings: pwm: rockchip: add interrupts property | expand |
On 2022-09-29 15:04, Johan Jonker wrote: > The Rockchip rk3288 SoC has 4-built-in PWM channels. > > Configurable to operate in capture mode. > Measures the high/low polarity effective cycles of this input waveform > Generates a single interrupt at the transition of input waveform polarity > > Configurable to operate in continuous mode or one-shot mode. > One-shot operation will produce N + 1 periods of the waveform, > where N is the repeat counter value, and generates a single interrupt at > the end of operation. > Continuous mode generates the waveform continuously and > do not generates any interrupts. > > Add interrupts property to rk3288 PWM nodes. As far as I can make out from the TRM, these are only valid when GRF_SOC_CON2[0] = 0, otherwise it's in "new" RK_PWM mode using SPI 78 for all channels. Which apparently will be the case for anyone using upstream U-Boot: https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/mach-rockchip/rk3288/rk3288.c#L83 Thanks, Robin. > Signed-off-by: Caesar Wang <wxt@rock-chips.com> > Signed-off-by: Johan Jonker <jbx6244@gmail.com> > > --- > > Original patch location: > ARM: dts: rk3288: add the interrupts property for PWM > https://github.com/rockchip-linux/kernel/commit/16b7b284618d1652e694f6286f575ce82f5f03e5 > > --- > > "rockchip,rk3288-pwm" is in use as fall back string for Rockchip SoCs with combined > PWM interrupt. > --- > arch/arm/boot/dts/rk3288.dtsi | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi > index 487b0e03d..1223aa369 100644 > --- a/arch/arm/boot/dts/rk3288.dtsi > +++ b/arch/arm/boot/dts/rk3288.dtsi > @@ -675,6 +675,7 @@ > pwm0: pwm@ff680000 { > compatible = "rockchip,rk3288-pwm"; > reg = <0x0 0xff680000 0x0 0x10>; > + interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>; > #pwm-cells = <3>; > pinctrl-names = "default"; > pinctrl-0 = <&pwm0_pin>; > @@ -685,6 +686,7 @@ > pwm1: pwm@ff680010 { > compatible = "rockchip,rk3288-pwm"; > reg = <0x0 0xff680010 0x0 0x10>; > + interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>; > #pwm-cells = <3>; > pinctrl-names = "default"; > pinctrl-0 = <&pwm1_pin>; > @@ -695,6 +697,7 @@ > pwm2: pwm@ff680020 { > compatible = "rockchip,rk3288-pwm"; > reg = <0x0 0xff680020 0x0 0x10>; > + interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>; > #pwm-cells = <3>; > pinctrl-names = "default"; > pinctrl-0 = <&pwm2_pin>; > @@ -705,6 +708,7 @@ > pwm3: pwm@ff680030 { > compatible = "rockchip,rk3288-pwm"; > reg = <0x0 0xff680030 0x0 0x10>; > + interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>; > #pwm-cells = <3>; > pinctrl-names = "default"; > pinctrl-0 = <&pwm3_pin>;
On Thu, Sep 29, 2022 at 04:04:06PM +0200, Johan Jonker wrote: > The Rockchip rk3288 SoC has 4-built-in PWM channels. > > Configurable to operate in capture mode. > Measures the high/low polarity effective cycles of this input waveform > Generates a single interrupt at the transition of input waveform polarity > > Configurable to operate in continuous mode or one-shot mode. > One-shot operation will produce N + 1 periods of the waveform, > where N is the repeat counter value, and generates a single interrupt at > the end of operation. > Continuous mode generates the waveform continuously and > do not generates any interrupts. > > Add interrupts property to rk3288 PWM nodes. > > Signed-off-by: Caesar Wang <wxt@rock-chips.com> > Signed-off-by: Johan Jonker <jbx6244@gmail.com> > > --- Please thread your series properly. That's replies to the cover letter or patch 1 if there isn't a cover letter. git-send-email does this by default. Rob
On Thu, Sep 29, 2022 at 04:50:43PM +0100, Robin Murphy wrote: > On 2022-09-29 15:04, Johan Jonker wrote: > > The Rockchip rk3288 SoC has 4-built-in PWM channels. > > > > Configurable to operate in capture mode. > > Measures the high/low polarity effective cycles of this input waveform > > Generates a single interrupt at the transition of input waveform polarity > > > > Configurable to operate in continuous mode or one-shot mode. > > One-shot operation will produce N + 1 periods of the waveform, > > where N is the repeat counter value, and generates a single interrupt at > > the end of operation. > > Continuous mode generates the waveform continuously and > > do not generates any interrupts. > > > > Add interrupts property to rk3288 PWM nodes. > > As far as I can make out from the TRM, these are only valid when > GRF_SOC_CON2[0] = 0, otherwise it's in "new" RK_PWM mode using SPI 78 for > all channels. Which apparently will be the case for anyone using upstream > U-Boot: > > https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/mach-rockchip/rk3288/rk3288.c#L83 Huh, so it depends on a (software) setting which irqs are in use? So the patch isn't correct as is, but I have no idea how to make it right. Should we rely on the bootloader to fixup the dtb correctly? Anyhow, I'm marking the patch as 'changes-requested' in our patchwork instance. Best regards Uwe
Am Mittwoch, 19. Oktober 2022, 09:26:21 CEST schrieb Uwe Kleine-König: > On Thu, Sep 29, 2022 at 04:50:43PM +0100, Robin Murphy wrote: > > On 2022-09-29 15:04, Johan Jonker wrote: > > > The Rockchip rk3288 SoC has 4-built-in PWM channels. > > > > > > Configurable to operate in capture mode. > > > Measures the high/low polarity effective cycles of this input waveform > > > Generates a single interrupt at the transition of input waveform polarity > > > > > > Configurable to operate in continuous mode or one-shot mode. > > > One-shot operation will produce N + 1 periods of the waveform, > > > where N is the repeat counter value, and generates a single interrupt at > > > the end of operation. > > > Continuous mode generates the waveform continuously and > > > do not generates any interrupts. > > > > > > Add interrupts property to rk3288 PWM nodes. > > > > As far as I can make out from the TRM, these are only valid when > > GRF_SOC_CON2[0] = 0, otherwise it's in "new" RK_PWM mode using SPI 78 for > > all channels. Which apparently will be the case for anyone using upstream > > U-Boot: > > > > https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/mach-rockchip/rk3288/rk3288.c#L83 > > Huh, so it depends on a (software) setting which irqs are in use? In the past when Rockchip swapped one IP block for another they often had both in a soc for one generation (as a safeguard probably) So the rk3288 has two different pwm implementations and the GRF register selects which one is active. Heiko > So the > patch isn't correct as is, but I have no idea how to make it right. > Should we rely on the bootloader to fixup the dtb correctly? > > Anyhow, I'm marking the patch as 'changes-requested' in our patchwork > instance. > > Best regards > Uwe > >
diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi index 487b0e03d..1223aa369 100644 --- a/arch/arm/boot/dts/rk3288.dtsi +++ b/arch/arm/boot/dts/rk3288.dtsi @@ -675,6 +675,7 @@ pwm0: pwm@ff680000 { compatible = "rockchip,rk3288-pwm"; reg = <0x0 0xff680000 0x0 0x10>; + interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>; #pwm-cells = <3>; pinctrl-names = "default"; pinctrl-0 = <&pwm0_pin>; @@ -685,6 +686,7 @@ pwm1: pwm@ff680010 { compatible = "rockchip,rk3288-pwm"; reg = <0x0 0xff680010 0x0 0x10>; + interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>; #pwm-cells = <3>; pinctrl-names = "default"; pinctrl-0 = <&pwm1_pin>; @@ -695,6 +697,7 @@ pwm2: pwm@ff680020 { compatible = "rockchip,rk3288-pwm"; reg = <0x0 0xff680020 0x0 0x10>; + interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>; #pwm-cells = <3>; pinctrl-names = "default"; pinctrl-0 = <&pwm2_pin>; @@ -705,6 +708,7 @@ pwm3: pwm@ff680030 { compatible = "rockchip,rk3288-pwm"; reg = <0x0 0xff680030 0x0 0x10>; + interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>; #pwm-cells = <3>; pinctrl-names = "default"; pinctrl-0 = <&pwm3_pin>;