linux-kernel - Re: [PATCH v2 4/4] ARM: dts: meson: consistently disable pin bias

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Date:   Fri, 16 Nov 2018 07:45:14 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     jbrunet@...libre.com, khilman@...libre.com
Cc:     carlo@...one.org, devicetree@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] ARM: dts: meson: consistently disable pin bias

On Fri, Nov 9, 2018 at 3:05 PM Jerome Brunet <jbrunet@...libre.com> wrote:
>
> On Amlogic chipsets, the bias set through pinconf applies to the pad
> itself, not only the GPIO function. This means that even when we change
> the function of the pad from GPIO to anything else, the bias previously
> set still applies.
>
> As we have seen with the eMMC, depending on the bias type and the function,
> it may trigger problems.
>
> The underlying issue is that we inherit whatever was left by previous user
> of the pad (pinconf, u-boot or the ROM code). As a consequence, the actual
> setup we will get is undefined.
>
> There is nothing mentioned in the documentation about pad bias and pinmux
> function, however leaving it undefined is not an option.
>
> This change consistently disable the pad bias for every pinmux functions.
> It seems to work well, we can only assume that the necessary bias (if any)
> is already provided by the pin function itself.
>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
Acked-by: Martin Blumenstingl<martin.blumenstingl@...glemail.com>

my Odroid-C1 still boots fine from SD card and Ethernet (ping) also still works

Kevin, can you please move this patch from your v4.21/dt64 branch to
the v4.21/dt (32-bit) branch?
all other patches from this series are for the 64-bit SoCs, so only
this single patch has to be moved


Thank you!
Regards
Martin