[U-Boot] rockchip: rk3399-puma: set gpio4cd iodomain to 1.8V
Philipp Tomsich
philipp.tomsich at theobroma-systems.com
Fri Dec 15 15:48:05 UTC 2017
> The PCIe reset signal is connected to GPIO4_C6 on the Puma
> module. This pin is supplied by 1.8V, but the default iodomain
> setting is 3.0V and in this situation the pin is unable to go
> high.
>
> Linux assumes that this signal works in early boot
> as PCIe is probed before loading the iodomain driver.
>
> Make PCIe work in Linux by setting the gpio4cd iodomain to 1.8V.
>
> Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher at theobroma-systems.com>
> ---
>
> board/theobroma-systems/puma_rk3399/puma-rk3399.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
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