linux-kernel - Re: [linux-sunxi] Re: [PATCH 3/6] ARM: sun8i: r40: add 5V regulator for Banana Pi M2 Ultra

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Date:   Tue, 10 Oct 2017 10:25:35 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] Re: [PATCH 3/6] ARM: sun8i: r40: add 5V regulator
 for Banana Pi M2 Ultra

On Tue, Oct 10, 2017 at 7:25 AM, Icenowy Zheng <icenowy@...c.io> wrote:
>
>
> 于 2017年10月10日 GMT+08:00 上午5:04:07, Maxime Ripard <maxime.ripard@...e-electrons.com> 写到:
>>On Sun, Oct 08, 2017 at 04:29:03AM +0000, Icenowy Zheng wrote:
>>> On newer revisions of the Banana Pi M2 Ultra boards, the 5V power
>>output
>>> (used by HDMI, SATA and USB) is controller via a GPIO.
>>>
>>> Add the regulator node for it.
>>>
>>> Older revisions just have the 5V power output always on, and the GPIO
>>is
>>> reserved on these boards. So it won't affect the older revisions.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>>> ---
>>>  arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts | 9 +++++++++
>>>  1 file changed, 9 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
>>b/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
>>> index 7b52608cebe6..035599d870b9 100644
>>> --- a/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
>>> +++ b/arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts
>>> @@ -78,6 +78,15 @@
>>>              };
>>>      };
>>>
>>> +    reg_vcc5v0: vcc5v0 {
>>> +            compatible = "regulator-fixed";
>>> +            regulator-name = "vcc5v0";
>>> +            regulator-min-microvolt = <5000000>;
>>> +            regulator-max-microvolt = <5000000>;
>>> +            gpio = <&pio 7 23 GPIO_ACTIVE_HIGH>; /* PH23 */
>>> +            enable-active-high;
>>
>>This is redundant with the GPIO flag
>
> I remember someone suggested me to add this
> property (maybe wens). It's said that the driver may not
> process the GPIO_ACTIVE_HIGH correctly.

I believe it was me. The fixed regulator driver has not migrated to
the GPIO descriptor API, and it doesn't look like it cares about the
GPIO flags.

ChenYu