Re: [PATCH v2 3/5] arm64: dts: rockchip: add tsadc node for rk3328 SoC

[rocky.hao]

在 2017/8/11 14:38, Caesar Wang 写道:
> 在 2017年08月04日 16:06, Rocky Hao 写道:
> > add tsadc needed main information for rk3328 SoC.
> > 50000Hz is the max clock rate supported by tsadc module.
> >
> > Signed-off-by: Rocky Hao <rocky.hao@xxxxxxxxxxxxxx>
> > ---
> > Change in v2:
> > - remove gerrit Change-Id
> >
> >   arch/arm64/boot/dts/rockchip/rk3328.dtsi | 20 ++++++++++++++++++++
> >   1 file changed, 20 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi 
> > b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> > index db4b2708084d..186fb93fdffd 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> > +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> > @@ -308,6 +308,26 @@
> >           interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
> >       };
> > +    tsadc: tsadc@ff250000 {
> > +        compatible = "rockchip,rk3328-tsadc";
> > +        reg = <0x0 0xff250000 0x0 0x100>;
> > +        interrupts = <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH 0>;
> > +        rockchip,grf = <&grf>;
> > +        clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>;
> > +        clock-names = "tsadc", "apb_pclk";
> > +        assigned-clocks = <&cru SCLK_TSADC>;
> > +        assigned-clock-rates = <50000>;
> > +        resets = <&cru SRST_TSADC>;
> > +        reset-names = "tsadc-apb";
> > +        pinctrl-names = "init", "default", "sleep";
> > +        pinctrl-0 = <&otp_gpio>;
> > +        pinctrl-1 = <&otp_out>;
> > +        pinctrl-2 = <&otp_gpio>;
> > +        #thermal-sensor-cells = <1>;
>
> Only one sensor, so maybe the value should be 0.
Caesar, #thermal-sensor-cells means parameter counts used to match the 
proper sensor registered. Both 0 and 1 work well.

Case 0, i.e. #thermal-sensor-cells = <0>, it uses the default channel 
number 0 to match tsadc channal.
Case 1, i.e. #thermal-sensor-cells = <1>, it uses the setting 
"thermal-sensors = <&tsadc 0>;" to match tsadc channal.

Case 1 provides more readable info than case 0. By my understanding, 
using the default value such as case 0, is not a good coding style.

> > +        rockchip,hw-tshut-temp = <100000>;
> > +        status = "disabled";
> > +    };
> > +
> >       saradc: adc@ff280000 {
> >           compatible = "rockchip,rk3328-saradc", 
> > "rockchip,rk3399-saradc";
> >           reg = <0x0 0xff280000 0x0 0x100>;