[PATCH v2 0/2] pinctrl: sh-pfc: gen2: initialize TDSEL register for ES1.0

[Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>]

During our SDHI hackathon, we found that Lager was the only Gen2 board
having issues with a stubborn SD card. The issue went away when setting
TDSEL to the expected value mentioned in the H2 documentation which is
sadly not the default value. M2-W, M2-N, and V2H have an expected value
of 0 for TDSEL, so this is why they likely work out of the box (V2H has
non-zero drive strength bit, though). I can't verify those SoCs here, no
boards. E2 has a non-zero expected value as well, so we fix it in this
patch series as well (although on my board the bootloader prepares TDSEL
correctly, but let's not rely on that).

Changes since V1:

* we discussed this with the HW team internally and concluded this is only
  needed for ES1.0 versions of these SoCs. So, setting TDSEL is now
  whitelisted using soc_device_match.

* Chris added to CC
  For two reasons: first, to give him a chance to test this so we don't
  break the RZ series. Second, according to Geert, R-Car E2X and RZ/G1C
  might have the same 'non-zero default value of TDSEL' problem and maybe
  need fixing, too. But we don't have HW to check/test this.

Looking forward to comments!

Thanks,

   Wolfram


Wolfram Sang (2):
  pinctrl: sh-pfc: r8a7790: initialize TDSEL register for ES1.0
  pinctrl: sh-pfc: r8a7794: initialize TDSEL register for ES1.0

 drivers/pinctrl/sh-pfc/pfc-r8a7790.c | 17 +++++++++++++++++
 drivers/pinctrl/sh-pfc/pfc-r8a7794.c | 16 ++++++++++++++++
 2 files changed, 33 insertions(+)

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2.11.0