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mmc: sdhci: Distinguish between base clock and maximum peripheral frequency

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The sdhci controller assumes that the base clock frequency is fully supported by
the peripheral and doesn't support hardware limitations. The Linux kernel
distinguishes between base clock (max_clk) of the host controller and maximum
frequency (f_max) of the card interface. Use the same differentiation and allow
the platform to constrain the peripheral interface.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
This commit is contained in:
Stefan Herbrechtsmeier 2017-01-17 15:58:48 +01:00 • committed by Jaehoon Chung
parent 0c9e85f67c
commit 6d0e34bf4e
13 changed files with 52 additions and 34 deletions
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13
include/sdhci.h
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@ -244,6 +244,7 @@ struct sdhci_host {
unsigned int quirks;
unsigned int host_caps;
unsigned int version;
unsigned int max_clk; /* Maximum Base Clock frequency */
unsigned int clk_mul; /* Clock Multiplier value */
unsigned int clock;
struct mmc *mmc;
@ -371,11 +372,11 @@ static inline u8 sdhci_readb(struct sdhci_host *host, int reg)
*
* @cfg: Configuration structure to fill in (generally &plat->mmc)
* @host: SDHCI host structure
* @max_clk: Maximum supported clock speed in HZ (0 for default)
* @min_clk: Minimum supported clock speed in HZ (0 for default)
* @f_max: Maximum supported clock frequency in HZ (0 for default)
* @f_min: Minimum supported clock frequency in HZ (0 for default)
*/
int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host,
u32 max_clk, u32 min_clk);
u32 f_max, u32 f_min);
/**
* sdhci_bind() - Set up a new MMC block device
@ -401,11 +402,11 @@ int sdhci_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg);
* This is used when you are not using CONFIG_BLK. Convert your driver over!
*
* @host: SDHCI host structure
* @max_clk: Maximum supported clock speed in HZ (0 for default)
* @min_clk: Minimum supported clock speed in HZ (0 for default)
* @f_max: Maximum supported clock frequency in HZ (0 for default)
* @f_min: Minimum supported clock frequency in HZ (0 for default)
* @return 0 if OK, -ve on error
*/
int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk);
int add_sdhci(struct sdhci_host *host, u32 f_max, u32 f_min);
#endif /* !CONFIG_BLK */
#ifdef CONFIG_DM_MMC_OPS