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i2c: i2c-sh_mobile bus speed platform data V2

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Add support to the i2c-sh_mobile driver for setting
the I2C bus speed using platform data.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Magnus Damm 2011-04-28 13:25:36 +09:00 committed by Ben Dooks
parent 1082d5d29d
commit 81f8115305
2 changed files with 21 additions and 2 deletions
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13
drivers/i2c/busses/i2c-sh_mobile.c
View file

@ -32,6 +32,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/i2c/i2c-sh_mobile.h>
/* Transmit operation: */
/* */
@ -117,7 +118,7 @@ struct sh_mobile_i2c_data {
struct device *dev;
void __iomem *reg;
struct i2c_adapter adap;
unsigned long bus_speed;
struct clk *clk;
u_int8_t icic;
u_int8_t iccl;
@ -205,7 +206,7 @@ static void activate_ch(struct sh_mobile_i2c_data *pd)
* We also round off the result.
*/
num = i2c_clk * 5;
denom = NORMAL_SPEED * 9;
denom = pd->bus_speed * 9;
tmp = num * 10 / denom;
if (tmp % 10 >= 5)
pd->iccl = (u_int8_t)((num/denom) + 1);
@ -574,6 +575,7 @@ static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, int hook)
static int sh_mobile_i2c_probe(struct platform_device *dev)
{
struct i2c_sh_mobile_platform_data *pdata = dev->dev.platform_data;
struct sh_mobile_i2c_data *pd;
struct i2c_adapter *adap;
struct resource *res;
@ -618,6 +620,11 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
goto err_irq;
}
/* Use platformd data bus speed or NORMAL_SPEED */
pd->bus_speed = NORMAL_SPEED;
if (pdata && pdata->bus_speed)
pd->bus_speed = pdata->bus_speed;
/* The IIC blocks on SH-Mobile ARM processors
* come with two new bits in ICIC.
*/
@ -658,6 +665,8 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
goto err_all;
}
dev_info(&dev->dev, "I2C adapter %d with bus speed %lu Hz\n",
adap->nr, pd->bus_speed);
return 0;
err_all:

10
include/linux/i2c/i2c-sh_mobile.h Normal file
View file

@ -0,0 +1,10 @@
#ifndef __I2C_SH_MOBILE_H__
#define __I2C_SH_MOBILE_H__
#include <linux/platform_device.h>
struct i2c_sh_mobile_platform_data {
unsigned long bus_speed;
};
#endif /* __I2C_SH_MOBILE_H__ */