Hi Shawn,
On 03/03/2016 11:36 AM, Shawn Lin wrote:
> 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.
I don't know why need to add the capability and property.
>
> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>
> ---
>
> 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 */
Need to fix ordering.
> #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;
>
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