linux-kernel - Re: [PATCHv3] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+

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Message-ID: <CANAwSgRzdD0FWg+z6hTFs7KvpsD64bChX-k0dPXJfACXZH2zbQ@mail.gmail.com>
Date:   Sat, 22 Oct 2022 16:57:07 +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>,
        Dan Johansen <strit@...jaro.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3] arm64: dts: meson: Enable active coling using gpio-fan
 on Odroid N2/N2+

Hi Martin,

Thanks for your review comments..

On Sat, 22 Oct 2022 at 15:47, Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> Hi Anand,
>
> On Sat, Oct 22, 2022 at 10:48 AM 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. Drop bias-disable from set pwm_ao_d_10 the pin
> either use "on these boards" or "on this board"
>
> [...]
> > @@ -1982,7 +1982,6 @@ pwm_ao_d_10_pins: pwm-ao-d-10 {
> >                                                 mux {
> >                                                         groups = "pwm_ao_d_10";
> >                                                         function = "pwm_ao_d";
> > -                                                       bias-disable;
> &pwm_ao_d_10_pins is not referenced anywhere so it seems that this
> change has no impact on controlling the fan on Odroid-N2(+).
> How did you test this change?
>
Ok I felt these changes affect the behavior of the pinctrl

  * @PIN_CONFIG_BIAS_DISABLE: disable any pin bias on the pin, a
 *  transition from say pull-up to pull-down implies that you disable
 *  pull-up in the process, this setting disables all biasing.

I mapped this is linked in pinctrl driver, pwm_ao_d_10_pins GPIOAO_10 see below

[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pinctrl/meson/pinctrl-meson-g12a.c?h=v6.1-rc1#n825

For testing, I tried to libgpio command to verify shown below, with
this patch applied.
$ gpioinfo
....
gpiochip1 - 15 lines:
        line   0:      unnamed       unused   input  active-high
        line   1:      unnamed       unused   input  active-high
        line   2:      unnamed     "enable"  output  active-high [used]
        line   3:      unnamed       unused   input  active-high
        line   4:      unnamed       unused  output  active-high
        line   5:      unnamed       unused   input  active-high
        line   6:      unnamed       unused   input  active-high
        line   7:      unnamed       unused   input  active-high
        line   8:      unnamed "regulator-tflash_vdd" output active-high [used]
        line   9:      unnamed      "TF_IO"  output  active-high [used]
        line  10:      unnamed   "gpio-fan"  output  active-high [used]
        line  11:      unnamed    "n2:blue"  output  active-high [used]
        line  12:      unnamed       unused   input  active-high
        line  13:      unnamed       unused   input  active-high
        line  14:      unnamed       unused   input  active-high

$ cat /sys/kernel/debug/pinctrl/ff800000.sys-ctrl\:pinctrl@...pinctrl-meson/pinmux-pins
Pinmux settings per pin
Format: pin (name): mux_owner gpio_owner hog?
pin 0 (GPIOAO_0): ff803000.serial (GPIO UNCLAIMED) function uart_ao_a
group uart_ao_a_tx
pin 1 (GPIOAO_1): ff803000.serial (GPIO UNCLAIMED) function uart_ao_a
group uart_ao_a_rx
pin 2 (GPIOAO_2): (MUX UNCLAIMED) aobus-banks:1950
pin 3 (GPIOAO_3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 4 (GPIOAO_4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 5 (GPIOAO_5): ff808000.ir (GPIO UNCLAIMED) function
remote_ao_input group remote_ao_input
pin 6 (GPIOAO_6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 7 (GPIOAO_7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 8 (GPIOAO_8): (MUX UNCLAIMED) aobus-banks:1956
pin 9 (GPIOAO_9): (MUX UNCLAIMED) aobus-banks:1957
pin 10 (GPIOAO_10): (MUX UNCLAIMED) aobus-banks:1958
pin 11 (GPIOAO_11): (MUX UNCLAIMED) aobus-banks:1959
pin 12 (GPIOE_0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 13 (GPIOE_1): ff802000.pwm (GPIO UNCLAIMED) function pwm_ao_d
group pwm_ao_d_e
pin 14 (GPIOE_2): ffd1b000.pwm (GPIO UNCLAIMED) function pwm_a_e group pwm_a_e

$ sudo gpiomon  gpiochip1 10
gpiomon: error waiting for events: Device or resource busy

$ sudo gpioget  gpiochip1 10
gpioget: error reading GPIO values: Device or resource busy

If I am wrong I have previously sent it with a typo correction below.

[1] https://lore.kernel.org/all/20221021050906.1158-1-linux.amoon@gmail.com/

Thanks
-Anand
>
> Best regards,
> Martin