[PATCH 1/2 V3] MXS: Set I2C timing registers for mxs-i2c
From: Shawn Guo <hidden>
Date: 2012-06-11 06:39:05
Also in:
linux-i2c
On Sat, Jun 09, 2012 at 01:45:50PM +0200, Marek Vasut wrote:
This patch configures the I2C bus timing registers according to information passed via DT. Currently, 100kHz and 400kHz modes are supported. Signed-off-by: Marek Vasut <marex@denx.de>
I gave it a test on imx28-evk board with audio playback. It seems the patch makes the first time playback non-functional, but the later playback is still working.
+static int mxs_i2c_get_ofdata(struct mxs_i2c_dev *i2c)
+{
+ uint32_t speed;
+ struct device *dev = i2c->dev;
+ struct device_node *node = dev->of_node;
+
+ if (!node)
+ return -EINVAL;
+
+ i2c->speed = &mxs_i2c_95kHz_config;
+ ret = of_property_read_u32(node, "clock-frequency", &speed);"ret" is undeclared.
+ if (ret) + dev_warn(dev, "No I2C speed selected, using 100kHz\n"); + else if (speed == 400000) + i2c->speed = &mxs_i2c_400kHz_config; + else if (speed != 100000) + dev_warn(dev, "Invalid I2C speed selected, using 100kHz\n"); + + return 0; +} +
-- Regards, Shawn