Re: [PATCH] pinctrl: sunxi: A523: fix voltage withstand encoding

On Wed, 22 Jul 2026 00:39:56 +0200
Andre Przywara <[email protected]> wrote:

> The Allwinner A523 uses the same GPIO voltage "withstand" programming
> (setting the input level voltage thresholds) as the previous SoCs, but
> for some odd reason inverts the encoding of 1.8V vs. 3.3V.
> 
> Add a new bias voltage type to note this difference, and select it for
> the A523. At the same time also use the newer "CTL" version, which in
> addition allows to turn off the withstand programming for I/O voltages
> other than exact 1.8V or 3.3V (for instance for 2.5V sometimes used
> for Ethernet PHYs). The A523 has that enable register, but didn't use
> it so far.
> 
> This fixes eMMC and reportedly Ethernet operation on some A523 boards.
> 
> Fixes: 648be4cd9517 ("pinctrl: sunxi: Add support for the Allwinner
> A523") Signed-off-by: Andre Przywara <[email protected]>
> ---

I'd say this looks like the correct fix. With this (and removing
the incorrect voltage bump "fix") the eMMC on my X96QPro+ works.
Not seeing any regressions, so

Tested-by: Per Larsson <[email protected]>