linux-kernel - [PATCH v5 0/6] mmc: add support for BST C1200 SDHCI controller

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Message-ID: <20260123095342.272505-1-yangzh0906@thundersoft.com>
Date: Fri, 23 Jan 2026 17:53:36 +0800
From: Albert Yang <yangzh0906@...ndersoft.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ge Gordon <gordon.ge@....ai>,
	Arnd Bergmann <arnd@...db.de>
Cc: BST Linux Kernel Upstream Group <bst-upstream@...ai.top>,
	linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Albert Yang <yangzh0906@...ndersoft.com>
Subject: [PATCH v5 0/6] mmc: add support for BST C1200 SDHCI controller

This series adds MMC/eMMC controller support for Black Sesame Technologies
C1200 SoC. BST is a leading automotive-grade computing SoC provider focusing
on intelligent driving, computer vision, and AI capabilities for ADAS and
autonomous driving applications. More information: https://bst.ai

== Background ==

This is the MMC portion split from the original v4 series [1] following
feedback from Arnd Bergmann [2]. The platform support (vendor-prefix,
SoC bindings, Kconfig ARCH_BST, base DTS, defconfig ARCH_BST) has already
been merged into Linux 6.19 through the SoC tree [3].

== Series Overview ==

Patch 1: dt-bindings: mmc: add binding for BST DWCMSHC SDHCI controller
Patch 2: mmc: sdhci: allow drivers to pre-allocate bounce buffer
Patch 3: mmc: sdhci: add Black Sesame Technologies BST C1200 controller driver
Patch 4: arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board
Patch 5: arm64: defconfig: enable BST SDHCI controller
Patch 6: MAINTAINERS: add MMC files to BST entry

== Testing ==

  - checkpatch.pl: PASS (all patches)
  - dt_binding_check: PASS
  - dtbs_check (CHECK_DTBS=y): PASS
  - Build tested with ARCH=arm64 defconfig

== Changes since v4 ==

  - Split: Platform patches merged separately via SoC tree; this series is
    MMC-only, submitted to MMC maintainers

  DT binding (patch 1):
  - Rename file from bst,dwcmshc-sdhci.yaml to bst,c1200-sdhci.yaml
  - Fix example compatible string to match property definition

  Driver (patch 3):
  - Fix compatible string to match dt-bindings (bst,c1200-sdhci)
  - Simplify clock divider calculation with clearer frequency range logic
  - Add linux/bits.h and linux/bitfield.h headers
  - Remove unused linux/ioport.h header
  - Rename SDHCI_TUNING_COUNT to BST_TUNING_COUNT
  - Rename BST_EMMC_CTRL_BIT2 to BST_EMMC_CTRL_RST_N
  - Fix BST_DEFAULT_MAX_FREQ from 2MHz to 200MHz
  - Convert kernel-doc to regular comments (per Adrian Hunter)
  - Add sdhci_bst_free_bounce_buffer() helper (per Adrian Hunter)


== References ==

[1] v4: https://lore.kernel.org/lkml/20250923-v4-patch-final-v1-0-2283ad7cbf88@thundersoft.com/
[2] Split: https://lore.kernel.org/lkml/09b1318e-21dc-4354-8733-866b70696295@app.fastmail.com/
[3] Merged via soc-newsoc-6.19

Albert Yang (6):
  dt-bindings: mmc: add binding for BST DWCMSHC SDHCI controller
  mmc: sdhci: allow drivers to pre-allocate bounce buffer
  mmc: sdhci: add Black Sesame Technologies BST C1200 controller driver
  arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board
  arm64: defconfig: enable BST SDHCI controller
  MAINTAINERS: add MMC files to BST entry

 .../bindings/mmc/bst,c1200-sdhci.yaml         |  70 +++
 MAINTAINERS                                   |   2 +
 .../dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts    |  19 +
 arch/arm64/boot/dts/bst/bstc1200.dtsi         |  18 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/mmc/host/Kconfig                      |  14 +
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/sdhci-of-bst.c               | 521 ++++++++++++++++++
 drivers/mmc/host/sdhci.c                      |   7 +
 9 files changed, 653 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/bst,c1200-sdhci.yaml
 create mode 100644 drivers/mmc/host/sdhci-of-bst.c

base-commit: 0f61b1860cc3f52aef9036d7235ed1f017632193
-- 
2.43.0