i2c: designware: add support of platform data to set I2C mode

Use the platform data to set the clk_freq when there is no DT configuration
available. The clk_freq in turn will determine the I2C speed mode.

In Quark, there is currently no other configuration mechanism other than
board files.

Signed-off-by: Raymond Tan <raymond.tan@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hock Leong Kweh <hock.leong.kweh@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 8193e8eea764..4d6a6b94e2fa 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -41,6 +41,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
+#include <linux/platform_data/i2c-designware.h>
 #include "i2c-designware-core.h"
 
 static struct i2c_algorithm i2c_dw_algo = {
@@ -122,6 +123,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
         struct dw_i2c_dev *dev;
         struct i2c_adapter *adap;
         struct resource *mem;
+        struct dw_i2c_platform_data *pdata;
         int irq, r;
         u32 clk_freq;
 
@@ -182,6 +184,10 @@ static int dw_i2c_probe(struct platform_device *pdev)
                         dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
                         return -EINVAL;
                 }
+        } else {
+                pdata = dev_get_platdata(&pdev->dev);
+                if (pdata)
+                        clk_freq = pdata->i2c_scl_freq;
         }
 
         dev->functionality =