[U-Boot] [PATCH v4 7/9] mtd: rawnand: denali: add reset handling

[Simon Goldschmidt]

This adds reset handling to the devicetree-enabled Denali NAND driver.

For backwards compatibility, only a warning is printed when failing to
get reset handles.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

Changes in v4: None
Changes in v3:
- add DM_FLAG_OS_PREPARE flag

Changes in v2:
- fix copy/paste issues
- add .remove callback to release the resets

 drivers/mtd/nand/raw/denali.h    |  2 ++
 drivers/mtd/nand/raw/denali_dt.c | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/mtd/nand/raw/denali.h b/drivers/mtd/nand/raw/denali.h
index 019deda094..63ae828768 100644
--- a/drivers/mtd/nand/raw/denali.h
+++ b/drivers/mtd/nand/raw/denali.h
@@ -10,6 +10,7 @@
 #include <linux/bitops.h>
 #include <linux/mtd/rawnand.h>
 #include <linux/types.h>
+#include <reset.h>
 
 #define DEVICE_RESET				0x0
 #define     DEVICE_RESET__BANK(bank)			BIT(bank)
@@ -315,6 +316,7 @@ struct denali_nand_info {
 	void (*host_write)(struct denali_nand_info *denali, u32 addr, u32 data);
 	void (*setup_dma)(struct denali_nand_info *denali, dma_addr_t dma_addr,
 			  int page, int write);
+	struct reset_ctl_bulk resets;
 };
 
 #define DENALI_CAP_HW_ECC_FIXUP			BIT(0)
diff --git a/drivers/mtd/nand/raw/denali_dt.c b/drivers/mtd/nand/raw/denali_dt.c
index d384b974df..0ce81324b9 100644
--- a/drivers/mtd/nand/raw/denali_dt.c
+++ b/drivers/mtd/nand/raw/denali_dt.c
@@ -131,15 +131,30 @@ static int denali_dt_probe(struct udevice *dev)
 		denali->clk_x_rate = 200000000;
 	}
 
+	ret = reset_get_bulk(dev, &denali->resets);
+	if (ret)
+		dev_warn(dev, "Can't get reset: %d\n", ret);
+	else
+		reset_deassert_bulk(&denali->resets);
+
 	return denali_init(denali);
 }
 
+static int denali_dt_remove(struct udevice *dev)
+{
+	struct denali_nand_info *denali = dev_get_priv(dev);
+
+	return reset_release_bulk(&denali->resets);
+}
+
 U_BOOT_DRIVER(denali_nand_dt) = {
 	.name = "denali-nand-dt",
 	.id = UCLASS_MISC,
 	.of_match = denali_nand_dt_ids,
 	.probe = denali_dt_probe,
 	.priv_auto_alloc_size = sizeof(struct denali_nand_info),
+	.remove = denali_dt_remove,
+	.flags = DM_FLAG_OS_PREPARE,
 };
 
 void board_nand_init(void)
-- 
2.17.1