Commit 5c3d8a46 authored by Heiko Schocher's avatar Heiko Schocher Committed by Wolfram Sang

i2c: davinci: add OF support

add of support for the davinci i2c driver.
Signed-off-by: default avatarHeiko Schocher <hs@denx.de>
Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>

[wsa: fix indentation in the binding description]
Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
parent 002f002d
* 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>;
};
};
......@@ -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 */
......@@ -163,7 +166,6 @@ 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);
/* Send STOP */
flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
......@@ -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),
},
};
......
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