On 2016年12月15日 03:00, Andy Shevchenko wrote:
On Tue, 2016-12-13 at 21:34 +0100, Wolfram Sang wrote:
On Tue, Nov 22, 2016 at 12:41:40PM +0800, Zhangfei Gao wrote:
Some platforms like hi3660 need do reset first to allow accessing
registers
Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
Adding designware maintainers to CC...
---
drivers/i2c/busses/i2c-designware-core.h | 1 +
drivers/i2c/busses/i2c-designware-platdrv.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/drivers/i2c/busses/i2c-designware-core.h
b/drivers/i2c/busses/i2c-designware-core.h
index 0d44d2a..94b14fa 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -80,6 +80,7 @@ struct dw_i2c_dev {
void __iomem *base;
struct completion cmd_complete;
struct clk *clk;
+ struct reset_control *rst;
u32 (*get_clk_rate_khz) (struct
dw_i2c_dev *dev);
struct dw_pci_controller *controller;
int cmd_err;
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c
b/drivers/i2c/busses/i2c-designware-platdrv.c
index 0b42a12..fd80e58 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -38,6 +38,7 @@
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/io.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/platform_data/i2c-designware.h>
@@ -176,6 +177,10 @@ static int dw_i2c_plat_probe(struct
platform_device *pdev)
dev->irq = irq;
platform_set_drvdata(pdev, dev);
+ dev->rst = devm_reset_control_get(&pdev->dev, NULL);
+ if (!IS_ERR(dev->rst))
+ reset_control_reset(dev->rst);
Do we care about EPROBE_DEFER?
Perhaps on error path we need to assert it.
And I guess it should be devm_reset_control_get_optional().
Thanks Andy
Good suggestion, will update accordingly.
Thanks
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