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>

diff --git a/Documentation/devicetree/bindings/i2c/davinci.txt b/Documentation/devicetree/bindings/i2c/davinci.txt
new file mode 100644 (file)
index 0000000..2dc935b
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/davinci.txt
@@ -0,0 +1,28 @@
+* Texas Instruments Davinci I2C
+
+This file provides information, what the device node for the
+davinci i2c interface contain.
+
+Required properties:
+- compatible: "ti,davinci-i2c";
+- reg : Offset and length of the register set for the device
+
+Recommended properties :
+- interrupts : standard interrupt property.
+- clock-frequency : desired I2C bus clock frequency in Hz.
+
+Example (enbw_cmc board):
+       i2c@1c22000 {
+               compatible = "ti,davinci-i2c";
+               reg = <0x22000 0x1000>;
+               clock-frequency = <100000>;
+               interrupts = <15>;
+               interrupt-parent = <&intc>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               dtt@48 {
+                       compatible = "national,lm75";
+                       reg = <0x48>;
+               };
+       };

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 79b4bcb3b85cea6d79d1c447200748811d74d6fc..b6185dccdf4a9e79d8eba696ce9fe498850e710e 100644 (file)
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -38,6 +38,8 @@
 #include <linux/slab.h>
 #include <linux/cpufreq.h>
 #include <linux/gpio.h>
+#include <linux/of_i2c.h>
+#include <linux/of_device.h>
 
 #include <mach/hardware.h>
 #include <mach/i2c.h>
@@ -114,6 +116,7 @@ struct davinci_i2c_dev {
        struct completion       xfr_complete;
        struct notifier_block   freq_transition;
 #endif
+       struct davinci_i2c_platform_data *pdata;
 };
 
 /* default platform data to use if not supplied in the platform_device */
@@ -155,7 +158,7 @@ static void generic_i2c_clock_pulse(unsigned int scl_pin)
 static void i2c_recover_bus(struct davinci_i2c_dev *dev)
 {
        u32 flag = 0;
-       struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
+       struct davinci_i2c_platform_data *pdata = dev->pdata;
 
        dev_err(dev->dev, "initiating i2c bus recovery\n");
        /* Send NACK to the slave */
@@ -163,8 +166,7 @@ static void i2c_recover_bus(struct davinci_i2c_dev *dev)
        flag |=  DAVINCI_I2C_MDR_NACK;
        /* write the data into mode register */
        davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
-       if (pdata)
-               generic_i2c_clock_pulse(pdata->scl_pin);
+       generic_i2c_clock_pulse(pdata->scl_pin);
        /* Send STOP */
        flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
        flag |= DAVINCI_I2C_MDR_STP;
@@ -187,7 +189,7 @@ static inline void davinci_i2c_reset_ctrl(struct davinci_i2c_dev *i2c_dev,
 
 static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)
 {
-       struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
+       struct davinci_i2c_platform_data *pdata = dev->pdata;
        u16 psc;
        u32 clk;
        u32 d;
@@ -235,10 +237,7 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)
  */
 static int i2c_davinci_init(struct davinci_i2c_dev *dev)
 {
-       struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
-
-       if (!pdata)
-               pdata = &davinci_i2c_platform_data_default;
+       struct davinci_i2c_platform_data *pdata = dev->pdata;
 
        /* put I2C into reset */
        davinci_i2c_reset_ctrl(dev, 0);
@@ -260,6 +259,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev)
        dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n",
                pdata->bus_freq, pdata->bus_delay);
 
+
        /* Take the I2C module out of reset: */
        davinci_i2c_reset_ctrl(dev, 1);
 
@@ -308,13 +308,11 @@ static int
 i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
 {
        struct davinci_i2c_dev *dev = i2c_get_adapdata(adap);
-       struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
+       struct davinci_i2c_platform_data *pdata = dev->pdata;
        u32 flag;
        u16 w;
        int r;
 
-       if (!pdata)
-               pdata = &davinci_i2c_platform_data_default;
        /* Introduce a delay, required for some boards (e.g Davinci EVM) */
        if (pdata->bus_delay)
                udelay(pdata->bus_delay);
@@ -635,6 +633,12 @@ static struct i2c_algorithm i2c_davinci_algo = {
        .functionality  = i2c_davinci_func,
 };
 
+static const struct of_device_id davinci_i2c_of_match[] = {
+       {.compatible = "ti,davinci-i2c", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, davinci_i2c_of_match);
+
 static int davinci_i2c_probe(struct platform_device *pdev)
 {
        struct davinci_i2c_dev *dev;
@@ -674,8 +678,27 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 #endif
        dev->dev = get_device(&pdev->dev);
        dev->irq = irq->start;
+       dev->pdata = dev->dev->platform_data;
        platform_set_drvdata(pdev, dev);
 
+       if (!dev->pdata && pdev->dev.of_node) {
+               u32 prop;
+
+               dev->pdata = devm_kzalloc(&pdev->dev,
+                       sizeof(struct davinci_i2c_platform_data), GFP_KERNEL);
+               if (!dev->pdata) {
+                       r = -ENOMEM;
+                       goto err_free_mem;
+               }
+               memcpy(dev->pdata, &davinci_i2c_platform_data_default,
+                       sizeof(struct davinci_i2c_platform_data));
+               if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+                       &prop))
+                       dev->pdata->bus_freq = prop / 1000;
+       } else if (!dev->pdata) {
+               dev->pdata = &davinci_i2c_platform_data_default;
+       }
+
        dev->clk = clk_get(&pdev->dev, NULL);
        if (IS_ERR(dev->clk)) {
                r = -ENODEV;
@@ -711,6 +734,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
        adap->algo = &i2c_davinci_algo;
        adap->dev.parent = &pdev->dev;
        adap->timeout = DAVINCI_I2C_TIMEOUT;
+       adap->dev.of_node = pdev->dev.of_node;
 
        adap->nr = pdev->id;
        r = i2c_add_numbered_adapter(adap);
@@ -718,6 +742,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
                dev_err(&pdev->dev, "failure adding adapter\n");
                goto err_free_irq;
        }
+       of_i2c_register_devices(adap);
 
        return 0;
 
@@ -809,6 +834,7 @@ static struct platform_driver davinci_i2c_driver = {
                .name   = "i2c_davinci",
                .owner  = THIS_MODULE,
                .pm     = davinci_i2c_pm_ops,
+               .of_match_table = of_match_ptr(davinci_i2c_of_match),
        },
 };