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mmc: core: Add helper for parsing clock phase properties

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Drivers for MMC hosts that accept phase corrections can take advantage
of the helper by embedding an instance of struct mmc_clk_phase_map in
their private data and invoking mmc_of_parse_clk_phase() to extract
phase parameters. It is the responsibility of the host driver to
translate and apply the extracted values to hardware as required.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20210114031433.2388532-2-andrew@aj.id.au
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Andrew Jeffery
2021-01-14 13:44:28 +10:30
committed by Ulf Hansson
parent 7c7905df68
commit 3561afa026
2 changed files with 57 additions and 0 deletions
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13
include/linux/mmc/host.h
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@@ -79,6 +79,17 @@ struct mmc_ios {
bool enhanced_strobe; /* hs400es selection */
};
struct mmc_clk_phase {
bool valid;
u16 in_deg;
u16 out_deg;
};
#define MMC_NUM_CLK_PHASES (MMC_TIMING_MMC_HS400 + 1)
struct mmc_clk_phase_map {
struct mmc_clk_phase phase[MMC_NUM_CLK_PHASES];
};
struct mmc_host;
struct mmc_host_ops {
@@ -490,6 +501,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *);
int mmc_add_host(struct mmc_host *);
void mmc_remove_host(struct mmc_host *);
void mmc_free_host(struct mmc_host *);
void mmc_of_parse_clk_phase(struct mmc_host *host,
struct mmc_clk_phase_map *map);
int mmc_of_parse(struct mmc_host *host);
int mmc_of_parse_voltage(struct device_node *np, u32 *mask);