linux-kernel - [PATCH] mtd: spi-nor: cadence-quadspi: add reset control

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Message-Id: <20190408165046.24310-1-dinguyen@kernel.org>
Date:   Mon,  8 Apr 2019 11:50:46 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     linux-mtd@...ts.infradead.org
Cc:     dinguyen@...nel.org, marex@...x.de, tudor.ambarus@...rochip.com,
        dwmw2@...radead.org, computersforpeace@...il.com,
        bbrezillon@...nel.org, linux-kernel@...r.kernel.org,
        Tien-Fong Chee <tien.fong.chee@...el.com>
Subject: [PATCH] mtd: spi-nor: cadence-quadspi: add reset control

Get the reset control for the QSPI controller and bring it out of reset.

Suggested-by: Tien-Fong Chee <tien.fong.chee@...el.com>
Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
---
 drivers/mtd/spi-nor/cadence-quadspi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index 792628750eec..710a853f9d13 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -34,6 +34,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/sched.h>
 #include <linux/spi/spi.h>
 #include <linux/timer.h>
@@ -1336,6 +1337,7 @@ static int cqspi_probe(struct platform_device *pdev)
 	struct cqspi_st *cqspi;
 	struct resource *res;
 	struct resource *res_ahb;
+	struct reset_control *rstc;
 	const struct cqspi_driver_platdata *ddata;
 	int ret;
 	int irq;
@@ -1362,6 +1364,14 @@ static int cqspi_probe(struct platform_device *pdev)
 		return PTR_ERR(cqspi->clk);
 	}
 
+	/* Obtain QSPI reset control */
+	rstc = devm_reset_control_get_exclusive(dev, NULL);
+	if (!IS_ERR(rstc)) {
+		reset_control_assert(rstc);
+		udelay(1);
+		reset_control_deassert(rstc);
+	}
+
 	/* Obtain and remap controller address. */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	cqspi->iobase = devm_ioremap_resource(dev, res);
-- 
2.20.0