[PATCH 0/5 RFC] mmc: sdhci-iproc: add bcm2835 support

[Stefan Wahren]

This patch series based on the suggestion of Scott Branden to implement
bcm2835 support into sdhci-iproc [1].

These changes provide the following advantages:
  * no need to maintain a separate driver for bcm2835
  * improve support and test coverage of bcm2835 mmc support
  * get the rid of SDHCI_CAPABILITIES hack in bcm2835_sdhci_readl
  * increase write performance by avoiding delays in write ops

Patch 1 and 2 adopt two sdhci-bcm2835 fixes to sdhci-iproc. The third patch
tries to specify as much quirks as possible in the bcm283x.dtsi as possible.
Patch 4 and 5 are the actually changes for bcm2835 support.

These series has been tested on Raspberry Pi B with dd (direct I/O):

sdhci-bcm2835

378 kB/s WRITE
10,6 MB/s READ

sdhci-iproc (after applying patch series)

881 kB/s WRITE
10,8 MB/s READ

[1] - https://lkml.org/lkml/2015/12/22/525

Stefan Wahren (5):
  mmc: sdhci-iproc: Clean up platform allocations if shdci init fails
  mmc: sdhci-iproc: Actually enable the clock
  ARM: bcm283x: specify sdhci quirks in dtsi file
  mmc: sdhci-iproc: add bcm2835 support
  DT: sdhci-iproc: add bcm2835 compatible

 .../devicetree/bindings/mmc/brcm,sdhci-iproc.txt   |    5 ++-
 arch/arm/boot/dts/bcm283x.dtsi                     |    2 ++
 drivers/mmc/host/Kconfig                           |    6 ++--
 drivers/mmc/host/sdhci-iproc.c                     |   33 ++++++++++++++++++--
 4 files changed, 39 insertions(+), 7 deletions(-)

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1.7.9.5