linux-kernel - Re: [PATCH 4/5] arm64: dts: allwinner: a64: Add pwm device

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Date:   Tue, 13 Mar 2018 09:29:09 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Harald Geyer <harald@...ib.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>,
        Icenowy Zheng <icenowy@...c.io>, info@...mex.com
Subject: Re: [PATCH 4/5] arm64: dts: allwinner: a64: Add pwm device

On Mon, Mar 12, 2018 at 04:10:49PM +0000, Harald Geyer wrote:
> This device is compatible with A13, so no new driver is needed.
> 
> Signed-off-by: Harald Geyer <harald@...ib.org>
> ---
> I saw that Andre Przywara has been working on A64 pwm too and has
> submitted some patches a few days ago. I think his patches are functionally
> equivalent to this one here, but clean up things a bit and thus are
> preferable. See:
> 
> https://groups.google.com/forum/#!topic/linux-sunxi/hQFeteP591k
> 
> I'm including my patch here mostly to have a consistent series for others
> to test. OTOH you might merge the device tree changes here and pick up
> the cleanup patches from him. Either way should work fine.
> 
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 05d5e8def68a..95d52f6aa07f 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -364,6 +364,11 @@
>  				bias-pull-up;
>  			};
>  
> +			pwm_pin: pwm_pin {
> +				pins = "PD22";
> +				function = "pwm";
> +			};
> +
>  			rmii_pins: rmii_pins {
>  				pins = "PD10", "PD11", "PD13", "PD14", "PD17",
>  				       "PD18", "PD19", "PD20", "PD22", "PD23";
> @@ -629,6 +634,14 @@
>  			#interrupt-cells = <3>;
>  		};
>  
> +		pwm: pwm@...1400 {
> +			compatible = "allwinner,sun5i-a13-pwm";

Just like for the watchdog, you should have an A64 compatible there.

> +			reg = <0x01c21400 0x8>;

And you should use the full memory range here.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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