linux-kernel - Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+

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Date:   Wed, 19 Oct 2022 15:18:08 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on
 Odroid N2/N2+

Hi Martin,

On Wed, 19 Oct 2022 at 08:36, Anand Moon <linux.amoon@...il.com> wrote:
>
> Hi Martin,
>
> On Wed, 19 Oct 2022 at 02:46, Martin Blumenstingl
> <martin.blumenstingl@...glemail.com> wrote:
> >
> > Hello Anand,
> >
> > On Tue, Oct 18, 2022 at 9:53 PM Anand Moon <linux.amoon@...il.com> wrote:
> > >
> > > Odroid N2/N2+ support active cooling via gpio-fan controller.
> > > Add fan controls and tip point for cpu and ddr thermal sensor
> > > on this boards.
> > In the schematics for board rev 0.6 [0] I cannot find any information
> > about a fan connector.
> > The schematics for board rev 0.3 [1] on the other hand document a PWM
> > based fan connector on page 16.
> > So now I am not sure whether your patch only applies to certain board
> > revisions, the schematics are incorrect, etc.
> >
> > Can you please provide some details about the fan connector on
> > Odroid-N2/N2+ and which hardware revisions are supported (and which
> > aren't) by your patch?
> >
> >
> Ok I got this wrong the schematics below there is pwm controller, not
> gpio controller
> GPIOAO.BIT10 (PWM)
> I will correct the patch sorry for the mistake I did not look more carefully.
>

As per the schematics GPIOAO_10 is controlled by PWMAO_D
But looking into the datasheet [0] I could not find the relevant
PWMAO_D pmw ip block to link the fan to the PWM controller.

[0] https://dn.odroid.com/S922X/ODROID-N2/Datasheet/S922X_Public_Datasheet_V0.2.pdf

I could get the PWM node but is not working for me.

@@ -547,6 +588,14 @@ &pwm_ab {
        status = "okay";
 };

+&pwm_AO_ab {
+       pinctrl-1 = <&pwm_ao_d_10_pins>;
+       pinctrl-names = "default";
+       clocks = <&xtal>;
+       clock-names = "clkin0";
+       status = "okay";
+};
+

Thanks
-Anand


> > Thank you!
> > Martin
> >
> >
> > [0] https://dn.odroid.com/S922X/ODROID-N2/Schematic/odroid-n2_rev0.6_20210121.pdf
> > [1] https://dn.odroid.com/S922X/ODROID-N2/Schematic/odroid-n2_rev0.3_20190117.pdf
> Thanks
> -Anand