Hi, Philipp
On 2016年12月16日 10:45, zhangfei wrote:
On 2016年12月15日 23:30, Ramiro Oliveira wrote:
Hi Andy and Zhangfei
On 12/15/2016 12:33 PM, Andy Shevchenko wrote:
On Thu, 2016-12-15 at 16:59 +0800, Zhangfei Gao wrote:
Some platforms like hi3660 need do reset first to allow accessing
registers
Patch itself looks good, but would be nice to have it tested.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
I tested the patch and it's working for the ARC architecture.
Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-core.h | 1 +
drivers/i2c/busses/i2c-designware-platdrv.c | 28
++++++++++++++++++++++++----
2 files changed, 25 insertions(+), 4 deletions(-)
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..e9016ae 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 +177,14 @@ static int dw_i2c_plat_probe(struct
platform_device *pdev)
dev->irq = irq;
platform_set_drvdata(pdev, dev);
+ dev->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
devm_reset_control_get_optional() is deprecated as explained in
linux/reset.h,
you should use devm_reset_control_get_optional_exclusive() or
devm_reset_control_get_optional_shared() instead, as applicable.
I submitted a similar patch earlier today and I made the same mistake.
Thanks Ramiro for the info
Will use devm_reset_control_get_optional_exclusive instead.
But should the interface be as simple as possible?
Thanks
Sorry, a bit confused.
Is that mean we should not use devm_reset_control_get_optional()
While driver should decide whether use
devm_reset_control_get_optional_exclusive() or
devm_reset_control_get_optional_shared()
What if different platform has different requirement?
Looks the difference between _exclusive and _shared is refcount,
How about handle this inside, and not decided by interface?
Thanks
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