From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
The clock frequecy supplied to the IP core is specific to a single
instance of the driver. This patch makes it possible to have multiple
Designware I2C cores in the system possibly running at different core
frequencies.
Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
Signed-off-by: Ben Dooks <ben-linux@xxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-core.c | 4 +++-
drivers/i2c/busses/i2c-designware-core.h | 1 +
drivers/i2c/busses/i2c-designware-platdrv.c | 6 ++++++
3 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 38d5a6b..cd52f17 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -142,10 +142,12 @@ static u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
*/
int i2c_dw_init(struct dw_i2c_dev *dev)
{
- u32 input_clock_khz = clk_get_rate(dev->clk) / 1000;
+ u32 input_clock_khz;
u32 ic_con, hcnt, lcnt;
u32 reg;
+ input_clock_khz = dev->get_clk_rate_khz(dev);
+
/* Configure register endianess access */
reg = dw_readl(dev, DW_IC_COMP_TYPE);
if (reg == ___constant_swab32(DW_IC_COMP_TYPE_VALUE)) {
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 4e37031..43de340 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -166,6 +166,7 @@ struct dw_i2c_dev {
struct completion cmd_complete;
struct mutex lock;
struct clk *clk;
+ u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
int cmd_err;
struct i2c_msg *msgs;
int msgs_num;
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 9d10ae8..08783a6 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -43,6 +43,10 @@ static struct i2c_algorithm i2c_dw_algo = {
.master_xfer = i2c_dw_xfer,
.functionality = i2c_dw_func,
};
+static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+ return clk_get_rate(dev->clk)/1000;
+}
static int __devinit dw_i2c_probe(struct platform_device *pdev)
{
@@ -84,6 +88,8 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dev);
dev->clk = clk_get(&pdev->dev, NULL);
+ dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+
if (IS_ERR(dev->clk)) {
r = -ENODEV;
goto err_free_mem;
--
1.7.3.4
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