Re: [PATCH v2 1/2] pinctrl: sh-pfc: r8a7790: initialize TDSEL register for ES1.0

[Simon Horman <horms@xxxxxxxxxxxx>]

On Mon, Jan 07, 2019 at 11:13:19PM +0100, Wolfram Sang wrote:
> Documentation for ES1.0 says that some bits in TDSEL must be set (ch
> 5.3.39 in R-Car H2 v0.91). However, the reset value of the register is
> 0, so software has to do it. Add this to the kernel driver to ensure
> this is really done independent of firmware versions and use
> whitelisting for ES versions known to need this.
> 
> This is needed for some SD cards supporting SDR104 transfer mode. For
> me, TDSEL was not initialized by the firmware and I had problems with
> the card when re-inserting it.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>