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dm: mmc: dwmmc: Add comments to the dwmmc setup functions

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These comments were missed when the original code was written. Add them to
help people port their drivers over.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-06-12 23:30:13 -06:00
parent 19ce924ff9
commit e7a773a0bc
1 changed files with 64 additions and 0 deletions
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64
include/dwmmc.h
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@ -224,9 +224,73 @@ static inline u8 dwmci_readb(struct dwmci_host *host, int reg)
return readb(host->ioaddr + reg);
}
#ifdef CONFIG_BLK
/**
* dwmci_setup_cfg() - Set up the configuration for DWMMC
*
* This is used to set up a DWMMC device when you are using CONFIG_BLK.
*
* This should be called from your MMC driver's probe() method once you have
* the information required.
*
* Generally your driver will have a platform data structure which holds both
* the configuration (struct mmc_config) and the MMC device info (struct mmc).
* For example:
*
* struct rockchip_mmc_plat {
* struct mmc_config cfg;
* struct mmc mmc;
* };
*
* ...
*
* Inside U_BOOT_DRIVER():
* .platdata_auto_alloc_size = sizeof(struct rockchip_mmc_plat),
*
* To access platform data:
* struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
*
* See rockchip_dw_mmc.c for an example.
*
* @cfg: Configuration structure to fill in (generally &plat->mmc)
* @name: Device name (normally dev->name)
* @buswidth: Bus width (in bits, such as 4 or 8)
* @caps: Host capabilities (MMC_MODE_...)
* @max_clk: Maximum supported clock speed in HZ (e.g. 400000)
* @min_clk: Minimum supported clock speed in HZ (e.g. 150000000)
*/
void dwmci_setup_cfg(struct mmc_config *cfg, const char *name, int buswidth,
uint caps, u32 max_clk, u32 min_clk);
/**
* dwmci_bind() - Set up a new MMC block device
*
* This is used to set up a DWMMC block device when you are using CONFIG_BLK.
* It should be called from your driver's bind() method.
*
* See rockchip_dw_mmc.c for an example.
*
* @dev: Device to set up
* @mmc: Pointer to mmc structure (normally &plat->mmc)
* @cfg: Empty configuration structure (generally &plat->cfg). This is
* normally all zeroes at this point. The only purpose of passing
* this in is to set mmc->cfg to it.
* @return 0 if OK, -ve if the block device could not be created
*/
int dwmci_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg);
#else
/**
* add_dwmci() - Add a new DWMMC interface
*
* This is used when you are not using CONFIG_BLK. Convert your driver over!
*
* @host: DWMMC host structure
* @max_clk: Maximum supported clock speed in HZ (e.g. 400000)
* @min_clk: Minimum supported clock speed in HZ (e.g. 150000000)
* @return 0 if OK, -ve on error
*/
int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk);
#endif /* !CONFIG_BLK */
#endif /* __DWMMC_HW_H */