I2c designware controller operate speed is configured in the register
IC_CON. Previously the operate speed is determined by a local variable
clk_freq. This patch will move the local variable clk_freq into struct
dw_i2c_dev. This change will ease the set and get of the clk_freq.
Signed-off-by: Weifeng Voon <weifeng.voon@xxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-core.h | 2 ++
drivers/i2c/busses/i2c-designware-platdrv.c | 12 ++++++------
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index cd409e7..87d406e 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -56,6 +56,7 @@
* @tx_fifo_depth: depth of the hardware tx fifo
* @rx_fifo_depth: depth of the hardware rx fifo
* @rx_outstanding: current master-rx elements in tx fifo
+ * @clk_freq: bus clock frequency
* @ss_hcnt: standard speed HCNT value
* @ss_lcnt: standard speed LCNT value
* @fs_hcnt: fast speed HCNT value
@@ -95,6 +96,7 @@ struct dw_i2c_dev {
unsigned int tx_fifo_depth;
unsigned int rx_fifo_depth;
int rx_outstanding;
+ u32 clk_freq;
u32 sda_hold_time;
u32 sda_falling_time;
u32 scl_falling_time;
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index d656657..1608cf4 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -155,7 +155,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
struct i2c_adapter *adap;
struct resource *mem;
int irq, r;
- u32 clk_freq, ht = 0;
+ u32 ht = 0;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@@ -175,10 +175,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dev);
/* fast mode by default because of legacy reasons */
- clk_freq = 400000;
+ dev->clk_freq = 400000;
if (pdata) {
- clk_freq = pdata->i2c_scl_freq;
+ dev->clk_freq = pdata->i2c_scl_freq;
} else {
device_property_read_u32(&pdev->dev, "i2c-sda-hold-time-ns",
&ht);
@@ -187,7 +187,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
device_property_read_u32(&pdev->dev, "i2c-scl-falling-time-ns",
&dev->scl_falling_time);
device_property_read_u32(&pdev->dev, "clock-frequency",
- &clk_freq);
+ &dev->clk_freq);
}
if (has_acpi_companion(&pdev->dev))
@@ -196,7 +196,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
/*
* Only standard mode at 100kHz and fast mode at 400kHz are supported.
*/
- if (clk_freq != 100000 && clk_freq != 400000) {
+ if (dev->clk_freq != 100000 && dev->clk_freq != 400000) {
dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
return -EINVAL;
}
@@ -212,7 +212,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK;
- if (clk_freq == 100000)
+ if (dev->clk_freq == 100000)
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
else
--
1.9.1
--
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