This patch adds the SDHCI support for APM X-Gene SoC using ARASAN SDHCI controller.

v1 change:
 * Use the CONFIG_ARM64_DMA_HAS_IOMMU for dma-mapping.

v2 change:
 * Drop the IOMMU support and switching to PIO mode for arasan.
   controller integrated inside APM X-Gene SoC.

v3 change:
 * Change the sdhci-of-arasan.c to support arasan4.9a.
 * Add quirks for arasan4.9a.

v4 change:
 * Cleanup the Documentation and dts.

v5 change:
 * Rebase the dts files.
 * Drop patch 2 and 3 as it is applied.

v6 change:
 * Clean the unrequired properties from dts.
 * Rename sdhc to sdhci.
 * support to disable timming using capability register read.

Signed-off-by: Suman Tripathi <redacted>
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Suman Tripathi (2):
  arm64: dts: Add the arasan sdhci nodes in apm-storm.dtsi.
  mmc: sdhci: Add support to disable SDR104/SDR50/DDR50 based on
    capability     register 0.

 arch/arm64/boot/dts/apm/apm-mustang.dts |  4 +++
 arch/arm64/boot/dts/apm/apm-storm.dtsi  | 43 +++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c                |  3 ++-
 3 files changed, 49 insertions(+), 1 deletion(-)

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1.8.2.1