[PATCH v4] gpio: mxc_gpio: fix reading state of GPIO pins in output mode

[Marek Vasut]

On 8/28/24 3:09 PM, Tomas Paukrt wrote:
> The PSR register works correctly for GPIO pins in input mode,
> but always returns 0 for GPIO pins in output mode unless the SION
> bit is set.
> 
> The DR register should be used for GPIO pins in output mode
> to allow correct getting of previously set output value.
> 
> Please note that the Linux gpio-mxc driver and the NXP U-Boot mxc_gpio
> driver already use the DR register for all GPIO pins in output mode:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=442b2494b17d1a4f0a14721580271eb23ebffd42
> https://github.com/nxp-imx/uboot-imx/commit/4afc3f90943c6b117f79b66d2cd04e64f437b0c2
> 
> Signed-off-by: Tomas Paukrt <tomaspaukrt at email.cz>

Reviewed-by: Marek Vasut <marex at denx.de>

Thanks