linux-kernel - Re: [PATCH] arm64: rockchip: enable Rockchip IO domain support

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Date:   Fri, 15 Dec 2017 17:03:15 +0100
From:   klaus.goger@...obroma-systems.com
To:     Heiko Stübner <heiko@...ech.de>
Cc:     linux-rockchip@...ts.infradead.org,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: rockchip: enable Rockchip IO domain support

> On 15.12.2017, at 16:55, Heiko Stübner <heiko@...ech.de> wrote:
> 
> Am Freitag, 15. Dezember 2017, 16:51:39 CET schrieb klaus.goger@...obroma-
> systems.com:
>>> On 15.12.2017, at 16:33, Heiko Stübner <heiko@...ech.de> wrote:
>>> 
>>> Am Freitag, 15. Dezember 2017, 13:20:10 CET schrieb Klaus Goger:
>>>> Make sure the IO domain support is active. This requires to enable
>>>> Adaptive Voltage Scaling class support too.
>>>> 
>>>> Without Rockchip IO domain support the internal level shifter on the
>>>> RK3399
>>>> will be misconfigured if used in the other voltage domain then the
>>>> default.
>>>> 
>>>> Signed-off-by: Klaus Goger <klaus.goger@...obroma-systems.com>
>>>> 
>>>> ---
>>>> 
>>>> arch/arm64/Kconfig.platforms | 2 ++
>>>> 1 file changed, 2 insertions(+)
>>>> 
>>>> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
>>>> index 2401373565ff..7c0b0ab12f18 100644
>>>> --- a/arch/arm64/Kconfig.platforms
>>>> +++ b/arch/arm64/Kconfig.platforms
>>>> @@ -150,6 +150,8 @@ config ARCH_ROCKCHIP
>>>> 
>>>> 	select GPIOLIB
>>>> 	select PINCTRL
>>>> 	select PINCTRL_ROCKCHIP
>>>> 
>>>> +	select POWER_AVS
>>>> +	select ROCKCHIP_IODOMAIN
>>> 
>>> I'm not sure if we really want this in the default arch Kconfig or if
>>> there
>>> are cases where the iodomain driver is not necessary.
>>> 
>>> On arm32 it just gets selected in the regular defconfig [0]
>> 
>> At least all currently supported 64bit Rockchip SoCs do have matching VSEL
>> GRF settings. For me it looked essential enough to enable for all as not
>> setting the correct I/O voltage will result in no output signal at all.
>> But I’m fine with a defconfig change if that’s the way to go.
>> Should I resend a patch or wait for other opinions?
> 
> Personally I would go with a defconfig change. I'd really like to keep the 
> kconfig stuff minimal and at least all arm64 Rockchip boards can at least
> boot without the iodomain driver.

As the gpio driver currently does not depend on iodomain bootup would be an issue
anyway. That's why we currently have to configure boot essential pins that are effected 
in U-Boot anyway. So let us drop this patch and I will resend a defconfig one.

Thanks,
Klaus