With this, user can add a 'resets' property into dw_mmc dts
node, and when driver probe and parse_dt, it will call
reset APIs to reset dw_mmc host controller.
Please also refer to Documentation/devicetree/bindings/reset/reset.txt
Signed-off-by: Guodong Xu <guodong.xu@xxxxxxxxxx>
Signed-off-by: Xinwei Kong <kong.kongxinwei@xxxxxxxxxxxxx>
Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 7 +++++++
include/linux/mmc/dw_mmc.h | 6 ++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 242f9a0..d3a7376 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2878,6 +2878,13 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
if (!pdata)
return ERR_PTR(-ENOMEM);
+ /* find reset controller when exist */
+ pdata->rstc = devm_reset_control_get_optional(dev, NULL);
+ if (IS_ERR(pdata->rstc))
+ pdata->rstc = NULL;
+ else
+ reset_control_deassert(pdata->rstc);
+
/* find out number of slots supported */
of_property_read_u32(np, "num-slots", &pdata->num_slots);
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 7b41c6d..b95cd84 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -14,9 +14,10 @@
#ifndef LINUX_MMC_DW_MMC_H
#define LINUX_MMC_DW_MMC_H
-#include <linux/scatterlist.h>
-#include <linux/mmc/core.h>
#include <linux/dmaengine.h>
+#include <linux/mmc/core.h>
+#include <linux/reset.h>
+#include <linux/scatterlist.h>
#define MAX_MCI_SLOTS 2
@@ -260,6 +261,7 @@ struct dw_mci_board {
/* delay in mS before detecting cards after interrupt */
u32 detect_delay_ms;
+ struct reset_control *rstc;
struct dw_mci_dma_ops *dma_ops;
struct dma_pdata *data;
};
--
1.9.1
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