i2c: davinci: add OF support
add of support for the davinci i2c driver. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Sekhar Nori <nsekhar@ti.com> [wsa: fix indentation in the binding description] Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Heiko Schocher
Wolfram Sang
parent
002f002d95
commit
5c3d8a46ac
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@ -0,0 +1,28 @@
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* Texas Instruments Davinci I2C
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This file provides information, what the device node for the
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davinci i2c interface contain.
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Required properties:
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- compatible: "ti,davinci-i2c";
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- reg : Offset and length of the register set for the device
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Recommended properties :
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- interrupts : standard interrupt property.
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- clock-frequency : desired I2C bus clock frequency in Hz.
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Example (enbw_cmc board):
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i2c@1c22000 {
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compatible = "ti,davinci-i2c";
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reg = <0x22000 0x1000>;
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clock-frequency = <100000>;
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interrupts = <15>;
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interrupt-parent = <&intc>;
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#address-cells = <1>;
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#size-cells = <0>;
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dtt@48 {
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compatible = "national,lm75";
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reg = <0x48>;
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};
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};
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@ -38,6 +38,8 @@
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#include <linux/slab.h>
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#include <linux/cpufreq.h>
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#include <linux/gpio.h>
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#include <linux/of_i2c.h>
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#include <linux/of_device.h>
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#include <mach/hardware.h>
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#include <mach/i2c.h>
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@ -114,6 +116,7 @@ struct davinci_i2c_dev {
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struct completion xfr_complete;
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struct notifier_block freq_transition;
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#endif
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struct davinci_i2c_platform_data *pdata;
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};
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/* default platform data to use if not supplied in the platform_device */
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@ -155,7 +158,7 @@ static void generic_i2c_clock_pulse(unsigned int scl_pin)
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static void i2c_recover_bus(struct davinci_i2c_dev *dev)
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{
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u32 flag = 0;
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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struct davinci_i2c_platform_data *pdata = dev->pdata;
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dev_err(dev->dev, "initiating i2c bus recovery\n");
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/* Send NACK to the slave */
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@ -163,8 +166,7 @@ static void i2c_recover_bus(struct davinci_i2c_dev *dev)
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flag |= DAVINCI_I2C_MDR_NACK;
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/* write the data into mode register */
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
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if (pdata)
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generic_i2c_clock_pulse(pdata->scl_pin);
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generic_i2c_clock_pulse(pdata->scl_pin);
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/* Send STOP */
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flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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flag |= DAVINCI_I2C_MDR_STP;
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@ -187,7 +189,7 @@ static inline void davinci_i2c_reset_ctrl(struct davinci_i2c_dev *i2c_dev,
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static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)
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{
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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struct davinci_i2c_platform_data *pdata = dev->pdata;
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u16 psc;
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u32 clk;
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u32 d;
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@ -235,10 +237,7 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)
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*/
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static int i2c_davinci_init(struct davinci_i2c_dev *dev)
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{
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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if (!pdata)
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pdata = &davinci_i2c_platform_data_default;
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struct davinci_i2c_platform_data *pdata = dev->pdata;
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/* put I2C into reset */
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davinci_i2c_reset_ctrl(dev, 0);
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@ -260,6 +259,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev)
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dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n",
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pdata->bus_freq, pdata->bus_delay);
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/* Take the I2C module out of reset: */
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davinci_i2c_reset_ctrl(dev, 1);
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@ -308,13 +308,11 @@ static int
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i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
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{
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struct davinci_i2c_dev *dev = i2c_get_adapdata(adap);
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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struct davinci_i2c_platform_data *pdata = dev->pdata;
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u32 flag;
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u16 w;
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int r;
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if (!pdata)
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pdata = &davinci_i2c_platform_data_default;
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/* Introduce a delay, required for some boards (e.g Davinci EVM) */
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if (pdata->bus_delay)
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udelay(pdata->bus_delay);
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@ -635,6 +633,12 @@ static struct i2c_algorithm i2c_davinci_algo = {
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.functionality = i2c_davinci_func,
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};
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static const struct of_device_id davinci_i2c_of_match[] = {
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{.compatible = "ti,davinci-i2c", },
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{},
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};
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MODULE_DEVICE_TABLE(of, davinci_i2c_of_match);
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static int davinci_i2c_probe(struct platform_device *pdev)
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{
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struct davinci_i2c_dev *dev;
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@ -674,8 +678,27 @@ static int davinci_i2c_probe(struct platform_device *pdev)
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#endif
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dev->dev = get_device(&pdev->dev);
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dev->irq = irq->start;
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dev->pdata = dev->dev->platform_data;
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platform_set_drvdata(pdev, dev);
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if (!dev->pdata && pdev->dev.of_node) {
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u32 prop;
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dev->pdata = devm_kzalloc(&pdev->dev,
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sizeof(struct davinci_i2c_platform_data), GFP_KERNEL);
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if (!dev->pdata) {
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r = -ENOMEM;
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goto err_free_mem;
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}
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memcpy(dev->pdata, &davinci_i2c_platform_data_default,
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sizeof(struct davinci_i2c_platform_data));
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if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency",
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&prop))
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dev->pdata->bus_freq = prop / 1000;
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} else if (!dev->pdata) {
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dev->pdata = &davinci_i2c_platform_data_default;
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}
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dev->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(dev->clk)) {
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r = -ENODEV;
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@ -711,6 +734,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
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adap->algo = &i2c_davinci_algo;
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adap->dev.parent = &pdev->dev;
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adap->timeout = DAVINCI_I2C_TIMEOUT;
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adap->dev.of_node = pdev->dev.of_node;
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adap->nr = pdev->id;
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r = i2c_add_numbered_adapter(adap);
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@ -718,6 +742,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "failure adding adapter\n");
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goto err_free_irq;
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}
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of_i2c_register_devices(adap);
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return 0;
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@ -809,6 +834,7 @@ static struct platform_driver davinci_i2c_driver = {
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.name = "i2c_davinci",
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.owner = THIS_MODULE,
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.pm = davinci_i2c_pm_ops,
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.of_match_table = of_match_ptr(davinci_i2c_of_match),
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},
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};
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