linux-kernel - [RFC PATCH 1/4] mmc: core: add cap-enhanced-strobe support

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Date:	Thu,  3 Mar 2016 10:36:25 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Michal Simek <michal.simek@...inx.com>, soren.brinkmann@...inx.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shawn Lin <shawn.lin@...k-chips.com>
Subject: [RFC PATCH 1/4] mmc: core: add cap-enhanced-strobe support

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 <shawn.lin@...k-chips.com>

---

 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