lkml.org 
[lkml]   [2019]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] mtd: spi-nor: cadence-quadspi: add reset control
Date
Get the reset control for the QSPI controller and bring it out of reset.

Suggested-by: Tien-Fong Chee <tien.fong.chee@intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.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
\
 
 \ /
  Last update: 2019-04-08 18:51    [W:0.040 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site