Devicetree

* Re: [PATCH 3/3] ARM: dts: sunxi: enable SDIO Wi-Fi on Orange Pi Zero
From: Hans de Goede @ 2016-11-23 14:29 UTC (permalink / raw)
  To: Chen-Yu Tsai, Maxime Ripard
  Cc: Mark Rutland, devicetree, Vishnu Patekar, Arnd Bergmann,
	Jonathan Corbet, Andre Przywara, linux-doc@vger.kernel.org,
	Russell King, linux-kernel, Icenowy Zheng, linux-arm-kernel
In-Reply-To: <CAGb2v64taF9x9MDYW+KUEEUUoSx0bF68QNc7uZXQoNrsozMGtg@mail.gmail.com>

Hi,

On 23-11-16 15:25, Chen-Yu Tsai wrote:
> On Wed, Nov 23, 2016 at 3:59 PM, Maxime Ripard
> <maxime.ripard@free-electrons.com> wrote:
>> Hi,
>>
>> On Tue, Nov 22, 2016 at 12:24:21AM +0800, Icenowy Zheng wrote:
>>> There's a Allwinner's XR819 SDIO Wi-Fi module soldered on the board of
>>> Orange Pi Zero, which used a dedicated regulator to power.
>>>
>>> Add the device tree node of the regulator, the enable gpio (with
>>> mmc-pwrseq) and the sdio controller.
>>>
>>> There's a out-of-tree driver tested to work with this device tree.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
>>> ---
>>> New patch in the patchset, since a out-of-tree working xradio driver is done.
>>>
>>> If there is any problem in this patch, it can be omitted.
>>
>> No particular problem with this one, however it can and should be
>> merged with the previous one.
>>
>> Minor comments below though.
>>
>>>
>>>  arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts | 42 ++++++++++++++++++++++++
>>>  1 file changed, 42 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
>>> index b428e47..39cac26 100644
>>> --- a/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
>>> +++ b/arch/arm/boot/dts/sun8i-h2plus-orangepi-zero.dts
>>> @@ -79,6 +79,24 @@
>>>                       gpios = <&pio 0 17 GPIO_ACTIVE_HIGH>;
>>>               };
>>>       };
>>> +
>>> +     reg_vcc_wifi: reg_vcc_wifi {
>>> +             compatible = "regulator-fixed";
>>> +             pinctrl-names = "default";
>>> +             pinctrl-0 = <&vcc_wifi_pin_opi0>;
>>> +             regulator-min-microvolt = <3300000>;
>>> +             regulator-max-microvolt = <3300000>;
>>> +             regulator-name = "vcc-wifi";
>>> +             enable-active-high;
>>> +             gpio = <&pio 0 20 GPIO_ACTIVE_HIGH>;
>>> +     };
>>> +
>>> +     wifi_pwrseq: wifi_pwrseq {
>>> +             compatible = "mmc-pwrseq-simple";
>>> +             pinctrl-names = "default";
>>> +             pinctrl-0 = <&wifi_pwrseq_pin_opi0>;
>>> +             reset-gpios = <&r_pio 0 7 GPIO_ACTIVE_LOW>;
>>> +     };
>>>  };
>>>
>>>  &ehci1 {
>>> @@ -95,6 +113,20 @@
>>>       status = "okay";
>>>  };
>>>
>>> +&mmc1 {
>>> +     pinctrl-names = "default";
>>> +     pinctrl-0 = <&mmc1_pins_a>;
>>> +     vmmc-supply = <&reg_vcc_wifi>;
>>> +     mmc-pwrseq = <&wifi_pwrseq>;
>>> +     bus-width = <4>;
>>> +     non-removable;
>>> +     status = "okay";
>>> +};
>>> +
>>> +&mmc1_pins_a {
>>> +     allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
>>
>> This should be bias-pull-up.
>
> IIRC I already added this for _all_ existing mmc pinmux settings?
>
>>
>>> +};
>>> +
>>>  &ohci1 {
>>>       status = "okay";
>>>  };
>>> @@ -104,6 +136,11 @@
>>>               pins = "PA17";
>>>               function = "gpio_out";
>>>       };
>>> +
>>> +     vcc_wifi_pin_opi0: vcc_wifi_pin@0 {
>>> +             allwinner,pins = "PA20";
>>
>> This should be pins
>>
>>> +             allwinner,function = "gpio_out";
>>
>> This should be function
>>
>>> +     };
>>>  };
>>>
>>>  &r_pio {
>>> @@ -111,6 +148,11 @@
>>>               pins = "PL10";
>>>               function = "gpio_out";
>>>       };
>>> +
>>> +     wifi_pwrseq_pin_opi0: wifi_pwrseq_pin@0 {
>>> +             allwinner,pins = "PL7";
>>> +             allwinner,function = "gpio_out";
>>
>> And same thing here.
>
> Might we do away with the pinmux for gpio pins tradition?
> Recent patches I've sent all omit them.

I'm in favor of doing away with them, except there were
we need to configure bias / strength.

Regards,

Hans

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