diff mbox series

[V6,19/23] mmc: mmci: add optional reset property

Message ID 1539000535-13261-20-git-send-email-ludovic.Barre@st.com (mailing list archive)
State New, archived
Headers show
Series mmc: mmci: add sdmmc variant for stm32 | expand

Commit Message

Ludovic BARRE Oct. 8, 2018, 12:08 p.m. UTC 
From: Ludovic Barre <ludovic.barre@st.com>

This patch adds a optional reset management.
STM32 sdmmc variant needs to reset hardware block
during the power cycle procedure (for re-initialization).

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
 drivers/mmc/host/mmci.c | 7 +++++++
 drivers/mmc/host/mmci.h | 2 ++
 2 files changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7607599..d636a0e 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -36,6 +36,7 @@ 
 #include <linux/pm_runtime.h>
 #include <linux/types.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/reset.h>
 
 #include <asm/div64.h>
 #include <asm/io.h>
@@ -1882,6 +1883,12 @@  static int mmci_probe(struct amba_device *dev,
 
 	dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
 
+	host->rst = devm_reset_control_get_optional_exclusive(&dev->dev, NULL);
+	if (IS_ERR(host->rst)) {
+		ret = PTR_ERR(host->rst);
+		goto clk_disable;
+	}
+
 	/* Get regulators and the supported OCR mask */
 	ret = mmc_regulator_get_supply(mmc);
 	if (ret)
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index cdcadd2..8ecb1ee 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -318,6 +318,8 @@  struct mmci_host {
 	struct clk		*clk;
 	u8			singleirq:1;
 
+	struct reset_control	*rst;
+
 	spinlock_t		lock;
 
 	unsigned int		mclk;