[RFC PATCH v3 0/3] Add MMC host driver for Spreadtrum SoC

From: Hongtao Wu
Date: Fri Aug 14 2015 - 12:56:49 EST

This patch adds MMC host driver for Spreadtrum SoC.
The following coding style may be not meet kernel coding style.
I am not sure this kind of coding style is better or worse.
1) A macro that represent some bits of a register is added a prefix "__",
for example:
#define SDHOST_16_HOST_CTRL_2 0x3E
#define __TIMING_MODE_SDR12 0x0000
#define __TIMING_MODE_SDR25 0x0001
#define __TIMING_MODE_SDR50 0x0002
I think it is more useful to distinguish a register from a bit of this
2) A function in order to operate a register is also added a prefix "_".
If the functions(A) call other function(B), we added a prefix "__" before B,
for example:
static inline void _sdhost_enable_int(struct sdhost_host *host, u32 mask)
__local_writel(mask, host, SDHOST_32_INT_ST_EN);
__local_writel(mask, host, SDHOST_32_INT_SIG_EN);
I think this make the relationship of the function call more explicit.

Changes in v3:
- add Spreadtrum MMC DT bindings.
- add MMC nodes in Spreadtrum DT files
- release resources when there is an error or removing MMC host driver.

Changes in v2:
- delete some redundant mdelay()
- add error handling in some functions.

Billows Wu(HongtaoWu) (3):
mmc: sprd: add MMC host driver for Spreadtrum SoC
Documentation: add Spreadtrum MMC DT bindings.
DT: add MMC nodes in Spreadtrum DT files.

Documentation/devicetree/bindings/mmc/sprd-mmc.txt | 46 +
arch/arm64/boot/dts/sprd/sc9836-openphone.dts | 24 +
arch/arm64/boot/dts/sprd/sharkl64.dtsi | 44 +
drivers/mmc/host/Kconfig | 6 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sprd_sdhost.c | 1202 ++++++++++++++++++++
drivers/mmc/host/sprd_sdhost.h | 615 ++++++++++
drivers/mmc/host/sprd_sdhost_debugfs.c | 212 ++++
drivers/mmc/host/sprd_sdhost_debugfs.h | 27 +
9 files changed, 2177 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/sprd-mmc.txt
create mode 100644 drivers/mmc/host/sprd_sdhost.c
create mode 100644 drivers/mmc/host/sprd_sdhost.h
create mode 100644 drivers/mmc/host/sprd_sdhost_debugfs.c
create mode 100644 drivers/mmc/host/sprd_sdhost_debugfs.h


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