With current implementation, when I2C is used as a module, for slave devices which operate at different frequencies, the bus frequency needs to be modified in the board configuration file and kernel needs to be re-built.
This patch addresses this issue by adding bus frequency as module parameter. Signed-off-by: vishwa <[email protected]> --- Since v1: a. added MODULE_PARAM_DESC. b. Moved module parameter definitions to the beginning of the file. c. 'pdata->bus_freq' is being set in i2c_davinci_init() function. drivers/i2c/busses/i2c-davinci.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 2222c87..8fbfaa2 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -98,6 +98,10 @@ #define DAVINCI_I2C_IMR_NACK BIT(1) #define DAVINCI_I2C_IMR_AL BIT(0) +static int i2c_davinci_busfreq; +module_param(i2c_davinci_busfreq, int, 0); +MODULE_PARM_DESC(i2c_davinci_busfreq, "bus frequency"); + struct davinci_i2c_dev { struct device *dev; void __iomem *base; @@ -243,6 +247,9 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev) /* put I2C into reset */ davinci_i2c_reset_ctrl(dev, 0); + if (i2c_davinci_busfreq != 0) + pdata->bus_freq = i2c_davinci_busfreq; + /* compute clock dividers */ i2c_davinci_calc_clk_dividers(dev); -- 1.5.6 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
