linux-kernel - [PATCH RFC 0/2] mmc: sdhci-pxav3: pinctrl setting for fast bus clocks

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Message-Id: <20250718-pxav3-uhs-v1-0-2e451256f1f6@dujemihanovic.xyz>
Date: Fri, 18 Jul 2025 23:12:37 +0200
From: Duje Mihanović <duje@...emihanovic.xyz>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>
Cc: Karel Balej <balejk@...fyz.cz>, David Wronek <david@...nlining.org>, 
 linux-mmc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 Duje Mihanović <duje@...emihanovic.xyz>
Subject: [PATCH RFC 0/2] mmc: sdhci-pxav3: pinctrl setting for fast bus
 clocks

Hello,

This small series adds a pinctrl setting for fast MMC bus clocks to the
pxav3 driver. On bus clocks above 100 MHz, driving the data pins at a
higher current helps maintain signal quality.

This series is related to Marvell PXA1908 SoC support; the latest
version of that patchset (v16 as of now) can be found at
https://lore.kernel.org/20250708-pxa1908-lkml-v16-0-b4392c484180@dujemihanovic.xyz

The series is RFC because of the following:
* I'm unsure whether setting pinctrl-{names,1} to true in the top level
  of the binding is correct.
* Other mainline MMC drivers select between default and UHS states based
  on the signal voltage. The PXA1908 vendor kernel does it based on the
  bus clock. I followed the vendor kernel, but do not know whether this
  is bad practice and therefore the other mainline drivers should be
  followed instead.

Signed-off-by: Duje Mihanović <duje@...emihanovic.xyz>
---
Duje Mihanović (2):
      dt-bindings: mmc: sdhci-pxa: add state_uhs pinctrl
      mmc: sdhci-pxav3: add state_uhs pinctrl setting

 .../devicetree/bindings/mmc/sdhci-pxa.yaml         | 45 +++++++++++++++++-----
 drivers/mmc/host/sdhci-pxav3.c                     | 30 ++++++++++++++-
 include/linux/platform_data/pxa_sdhci.h            |  7 ++++
 3 files changed, 71 insertions(+), 11 deletions(-)
---
base-commit: 347e9f5043c89695b01e66b3ed111755afcf1911
change-id: 20250718-pxav3-uhs-d956bfed13f0

Best regards,
-- 
Duje Mihanović <duje@...emihanovic.xyz>