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

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Message-ID: <402500e8-b4fe-9b8f-d634-e329191af1b8@linaro.org>
Date:   Wed, 19 Oct 2022 13:08:59 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Anand Moon <linux.amoon@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...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 Anand,

On 19/10/2022 11:48, Anand Moon wrote:
> 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 {

&pwm_AO_cd not _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

Neil