mmc: SD/MMC Host Controller for Wondermedia WM8505/WM8650

This patch adds support for the SD/MMC host controller found
on Wondermedia 8xxx series SoCs, currently supported under
arm/arch-vt8500.

A binding document is also included, based on mmc.txt with
additional properties.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Chris Ball <cjb@laptop.org>

Documentation/devicetree/bindings/mmc/vt8500-sdmmc.txt

@@ -0,0 +1,23 @@
+* Wondermedia WM8505/WM8650 SD/MMC Host Controller
+
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the wmt-sdmmc driver.
+
+Required properties:
+- compatible: Should be "wm,wm8505-sdhc".
+- interrupts: Two interrupts are required - regular irq and dma irq.
+
+Optional properties:
+- sdon-inverted: SD_ON bit is inverted on the controller
+
+Examples:
+
+sdhc@d800a000 {
+	compatible = "wm,wm8505-sdhc";
+	reg = <0xd800a000 0x1000>;
+	interrupts = <20 21>;
+	clocks = <&sdhc>;
+	bus-width = <4>;
+	sdon-inverted;
+};
+

MAINTAINERS

@@ -1221,6 +1221,7 @@ F:	drivers/video/wm8505fb*
 F:	drivers/video/wmt_ge_rops.*
 F:	drivers/tty/serial/vt8500_serial.c
 F:	drivers/rtc/rtc-vt8500-c
+F:	drivers/mmc/host/wmt-sdmmc.c
 
 ARM/ZIPIT Z2 SUPPORT
 M:	Marek Vasut <marek.vasut@gmail.com>

drivers/mmc/host/Kconfig

@@ -601,3 +601,14 @@ config MMC_USHC
 
 	  Note: These controllers only support SDIO cards and do not
 	  support MMC or SD memory cards.
+
+config MMC_WMT
+	tristate "Wondermedia SD/MMC Host Controller support"
+	depends on ARCH_VT8500
+	default y
+	help
+	  This selects support for the SD/MMC Host Controller on
+	  Wondermedia WM8505/WM8650 based SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called wmt-sdmmc.

drivers/mmc/host/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_MMC_SH_MMCIF)	+= sh_mmcif.o
 obj-$(CONFIG_MMC_JZ4740)	+= jz4740_mmc.o
 obj-$(CONFIG_MMC_VUB300)	+= vub300.o
 obj-$(CONFIG_MMC_USHC)		+= ushc.o
+obj-$(CONFIG_MMC_WMT)		+= wmt-sdmmc.o
 
 obj-$(CONFIG_MMC_SDHCI_PLTFM)		+= sdhci-pltfm.o
 obj-$(CONFIG_MMC_SDHCI_CNS3XXX)		+= sdhci-cns3xxx.o