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Date:   Thu, 8 Jun 2023 10:39:41 +0200
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Subject: Re: [v6 1/4] dt-bindings: pwm: Add ASPEED PWM Control documentation
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To:     Billy Tsai <billy_tsai@aspeedtech.com>,
        "jdelvare@suse.com" <jdelvare@suse.com>,
        "linux@roeck-us.net" <linux@roeck-us.net>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        "joel@jms.id.au" <joel@jms.id.au>,
        "andrew@aj.id.au" <andrew@aj.id.au>,
        "thierry.reding@gmail.com" <thierry.reding@gmail.com>,
        "u.kleine-koenig@pengutronix.de" <u.kleine-koenig@pengutronix.de>,
        "corbet@lwn.net" <corbet@lwn.net>,
        "p.zabel@pengutronix.de" <p.zabel@pengutronix.de>,
        "linux-hwmon@vger.kernel.org" <linux-hwmon@vger.kernel.org>,
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        "linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "patrick@stwcx.xyz" <patrick@stwcx.xyz>
References: <20230608021839.12769-1-billy_tsai@aspeedtech.com>
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 <4dffd320-8e30-fb30-6ded-79519afddc21@linaro.org>
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From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <SG2PR06MB336528007D2685F8D95DF4078B50A@SG2PR06MB3365.apcprd06.prod.outlook.com>
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On 08/06/2023 10:21, Billy Tsai wrote:
>         On 08/06/2023 09:47, Billy Tsai wrote:
>         >>
>         >>   >> +
>         >>   >> +allOf:
>         >>   >> +  - $ref: pwm.yaml#
>         >>   >> +
>         >>   >> +properties:
>         >>   >> +  compatible:
>         >>   >> +    enum:
>         >>   >> +      - aspeed,ast2600-pwm
>         >>   >> +
>         >>   >> +  "#pwm-cells":
>         >>   >> +    const: 3
>         >>
>         >>   > 3 cells? For one PWM? What are they?
>         >>
>         >> channel, period and polarity.
> 
>         > Don't cut my responses. You wrote you have one PWM output, so only one
>         > channel. What do you put then in the channel?
> 
> You need to put 0 in the cell of the channel, the example of the dts usage will like following:
> 
> pwm0: pwm0@1e610000 {
>         compatible = "aspeed,ast2600-pwm";
>         reg = <0x1e610000 0x8>;
>         #pwm-cells = <3>;
>         #address-cells = <1>;
>         #size-cells = <0>;
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_pwm0_default>;
>         clocks = <&syscon ASPEED_CLK_AHB>;
>         resets = <&syscon ASPEED_RESET_PWM>;
>         status = "okay";
> };
> 
> pwm1: pwm1@1e610010 {
>         compatible = "aspeed,ast2600-pwm";
>         reg = <0x1e610010 0x8>;
>         #pwm-cells = <3>;
>         #address-cells = <1>;
>         #size-cells = <0>;
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_pwm1_default>;
>         clocks = <&syscon ASPEED_CLK_AHB>;
>         resets = <&syscon ASPEED_RESET_PWM>;
>         status = "okay";

BTW, these are not two PWM devices but one. I don't understand why you
changed previous design into something like this, but this is not
representing your hardware.

Best regards,
Krzysztof