linux-kernel - Re: [PATCH] mips: dts: ingenic: x1000: Add PWM device tree node

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Message-ID: <8a3f88d8-3e94-1388-b1c6-b0f71d59f34c@wanyeetech.com>
Date:   Mon, 11 Apr 2022 20:41:26 +0800
From:   Zhou Yanjie <zhouyu@...yeetech.com>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>, robh+dt@...nel.org,
        krzk+dt@...nel.org
Cc:     paul@...pouillou.net, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: dts: ingenic: x1000: Add PWM device tree node

Hi Aidan,

On 2022/4/11 下午6:01, Aidan MacDonald wrote:
> Copied from the jz4740 devicetree and trimmed to 5 timers, which
> is what the hardware supports.
>
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---
>   arch/mips/boot/dts/ingenic/x1000.dtsi | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
>
> diff --git a/arch/mips/boot/dts/ingenic/x1000.dtsi b/arch/mips/boot/dts/ingenic/x1000.dtsi
> index 8bd27edef216..0dcf37527c8e 100644
> --- a/arch/mips/boot/dts/ingenic/x1000.dtsi
> +++ b/arch/mips/boot/dts/ingenic/x1000.dtsi
> @@ -127,6 +127,19 @@ wdt: watchdog@0 {
>   			clocks = <&tcu TCU_CLK_WDT>;
>   			clock-names = "wdt";
>   		};
> +
> +		pwm: pwm@40 {
> +			compatible = "ingenic,x1000-pwm";
> +			reg = <0x40 0x80>;


It seems more reasonable to use "reg = <0x40 0x80>" since the
X1000 has only 5 PWM channels.


> +
> +			#pwm-cells = <3>;
> +
> +			clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>,
> +				 <&tcu TCU_CLK_TIMER2>, <&tcu TCU_CLK_TIMER3>,
> +				 <&tcu TCU_CLK_TIMER4>;
> +			clock-names = "timer0", "timer1", "timer2",
> +				      "timer3", "timer4";


One line is now allowed to hold at most 100 characters,
so it is possible to use only one line like:

         clock-names = "timer0", "timer1", "timer2", "timer3", "timer4";

to reduce the number of lines in the dtsi file.


Thanks and best regards!


> +		};
>   	};
>   
>   	rtc: rtc@...03000 {