[v4,0/8] mmc: sdhci-pxav2: Add support for PXA168

Message

Doug Brown Jan. 12, 2023, 2:24 a.m. UTC

This is a revival of an earlier patch series from 2013 to add support
for the PXA168 SDHC controller, with an additional SDIO IRQ errata fix.
It also cleans up the clock naming to be consistent with the existing DT
schema shared with the pxav3 driver (in a backwards-compatible way).

Here is the original patch series this is based on:
https://lore.kernel.org/linux-mmc/[e-mail]/

Note that I left out the platform_specific_completion and clock gating
changes from the original patches. They both seemed controversial, and
don't seem necessary based on my testing. I've been running this code on
a PXA168 for months without any issues.

Changes in v4:
- Rebase on latest mmc/next to fix conflict with DT binding

Changes in v3:
- Use OF match data rather than of_match_device and of_device_is_compatible
- Simplify some instances of pdev->dev that could have just been "dev"
- Handle EPROBE_DEFER when getting the clock
- Use devm_clk_get_optional_enabled for the core clock (it's simpler)
- Clear sdio_mrq before calling mmc_request_done
- Small tweaks to devicetree binding requested by Krzysztof

Changes in v2:
- Fix mistakes in devicetree binding
- Use cleaner code for pxav1_readw suggested by Adrian
- Switch to request_done() and irq() for SDIO workaround CMD0 handling

Doug Brown (8):
  mmc: sdhci-pxav2: add initial support for PXA168 V1 controller
  mmc: sdhci-pxav2: enable CONFIG_MMC_SDHCI_IO_ACCESSORS
  mmc: sdhci-pxav2: add register workaround for PXA168 silicon bug
  mmc: sdhci-pxav2: change clock name to match DT bindings
  mmc: sdhci-pxav2: add optional core clock
  mmc: sdhci-pxav2: add SDIO card IRQ workaround for PXA168 V1
    controller
  mmc: sdhci-pxav2: add optional pinctrl for SDIO IRQ workaround
  dt-bindings: mmc: sdhci-pxa: add pxav1

 .../devicetree/bindings/mmc/sdhci-pxa.yaml    |  19 ++-
 drivers/mmc/host/Kconfig                      |   1 +
 drivers/mmc/host/sdhci-pxav2.c                | 153 ++++++++++++++++--
 3 files changed, 159 insertions(+), 14 deletions(-)