From: Alan Tull <[email protected]> Add "speed-mode" Device Tree property to select between standard and fast i2c mode. Previously, driver was hardwired as fast mode. Default to fast mode if property is not present.
Signed-off-by: Alan Tull <[email protected]> --- drivers/i2c/busses/i2c-designware-platdrv.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index bc87733..3fdc775 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -122,7 +122,7 @@ static int dw_i2c_probe(struct platform_device *pdev) struct dw_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem; - int irq, r; + int irq, r, speed_prop, ret, speed = DW_IC_CON_SPEED_FAST; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -167,6 +167,11 @@ static int dw_i2c_probe(struct platform_device *pdev) of_property_read_u32(pdev->dev.of_node, "i2c-scl-falling-time-ns", &dev->scl_falling_time); + + ret = of_property_read_u32(pdev->dev.of_node, + "speed-mode", &speed_prop); + if (!ret && (speed_prop == 0)) + speed = DW_IC_CON_SPEED_STD; } dev->functionality = @@ -177,7 +182,7 @@ static int dw_i2c_probe(struct platform_device *pdev) I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_I2C_BLOCK; dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | - DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; + DW_IC_CON_RESTART_EN | speed; /* Try first if we can configure the device from ACPI */ r = dw_i2c_acpi_configure(pdev); -- 1.7.9.5 -- 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
