This patch introduce cap-enhanced-strobe for platforms which want to enable enhanced strobe function from DT if the mmc host controller claims to support enhanced strobe.
Signed-off-by: Shawn Lin <[email protected]> --- Documentation/devicetree/bindings/mmc/mmc.txt | 1 + drivers/mmc/core/host.c | 2 ++ include/linux/mmc/host.h | 6 ++++++ 3 files changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt index ed23b9b..51ec979 100644 --- a/Documentation/devicetree/bindings/mmc/mmc.txt +++ b/Documentation/devicetree/bindings/mmc/mmc.txt @@ -39,6 +39,7 @@ Optional properties: - cap-power-off-card: powering off the card is safe - cap-mmc-hw-reset: eMMC hardware reset is supported - cap-sdio-irq: enable SDIO IRQ signalling on this interface +- cap-enhanced-strobe: enable enhanced strobe function for emmc v5.1+ - full-pwr-cycle: full power cycle of the card is supported - mmc-ddr-1_8v: eMMC high-speed DDR mode(1.8V I/O) is supported - mmc-ddr-1_2v: eMMC high-speed DDR mode(1.2V I/O) is supported diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 1d94607..b49d786 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -270,6 +270,8 @@ int mmc_of_parse(struct mmc_host *host) host->caps |= MMC_CAP_HW_RESET; if (of_property_read_bool(np, "cap-sdio-irq")) host->caps |= MMC_CAP_SDIO_IRQ; + if (of_property_read_bool(np, "cap-enhanced-strobe")) + host->caps |= MMC_CAP_ENHANCED_STROBE; if (of_property_read_bool(np, "full-pwr-cycle")) host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE; if (of_property_read_bool(np, "keep-power-in-suspend")) diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 8dd4d29..2a292b3 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -264,6 +264,7 @@ struct mmc_host { #define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */ #define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */ #define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */ +#define MMC_CAP_ENHANCED_STROBE (1 << 20) /* Host supports enhanced strobe */ #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */ #define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */ @@ -469,6 +470,11 @@ static inline int mmc_host_uhs(struct mmc_host *host) MMC_CAP_UHS_DDR50); } +static inline int mmc_host_enhanced_strobe(struct mmc_host *host) +{ + return host->caps & MMC_CAP_ENHANCED_STROBE; +} + static inline int mmc_host_packed_wr(struct mmc_host *host) { return host->caps2 & MMC_CAP2_PACKED_WR; -- 2.3.7
