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i2c-s3c2410: Add device tree support
Add device tree probe support for Samsung's s3c2410 i2c driver. Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Thomas Abraham
Ben Dooks
parent
4fd81eb2d6
commit
5a5f50802f
39
Documentation/devicetree/bindings/i2c/samsung-i2c.txt
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39
Documentation/devicetree/bindings/i2c/samsung-i2c.txt
Normal file
@ -0,0 +1,39 @@
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* Samsung's I2C controller
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The Samsung's I2C controller is used to interface with I2C devices.
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Required properties:
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- compatible: value should be either of the following.
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(a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
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(b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
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- reg: physical base address of the controller and length of memory mapped
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region.
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- interrupts: interrupt number to the cpu.
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- samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
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- gpios: The order of the gpios should be the following: <SDA, SCL>.
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The gpio specifier depends on the gpio controller.
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Optional properties:
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- samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
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specified, default value is 0.
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- samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
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specified, the default value in Hz is 100000.
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Example:
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i2c@13870000 {
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compatible = "samsung,s3c2440-i2c";
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reg = <0x13870000 0x100>;
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interrupts = <345>;
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samsung,i2c-sda-delay = <100>;
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samsung,i2c-max-bus-freq = <100000>;
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gpios = <&gpd1 2 0 /* SDA */
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&gpd1 3 0 /* SCL */>;
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#address-cells = <1>;
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#size-cells = <0>;
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wm8994@1a {
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compatible = "wlf,wm8994";
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reg = <0x1a>;
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};
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};
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@ -35,6 +35,8 @@
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#include <linux/cpufreq.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/of_i2c.h>
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#include <linux/of_gpio.h>
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#include <asm/irq.h>
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@ -79,6 +81,7 @@ struct s3c24xx_i2c {
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struct i2c_adapter adap;
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struct s3c2410_platform_i2c *pdata;
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int gpios[2];
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#ifdef CONFIG_CPU_FREQ
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struct notifier_block freq_transition;
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#endif
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@ -96,6 +99,12 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
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struct platform_device *pdev = to_platform_device(i2c->dev);
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enum s3c24xx_i2c_type type;
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#ifdef CONFIG_OF
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if (i2c->dev->of_node)
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return of_device_is_compatible(i2c->dev->of_node,
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"samsung,s3c2440-i2c");
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#endif
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type = platform_get_device_id(pdev)->driver_data;
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return type == TYPE_S3C2440;
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}
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@ -742,6 +751,49 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
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}
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#endif
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#ifdef CONFIG_OF
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static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
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{
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int idx, gpio, ret;
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for (idx = 0; idx < 2; idx++) {
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gpio = of_get_gpio(i2c->dev->of_node, idx);
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if (!gpio_is_valid(gpio)) {
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dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio);
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goto free_gpio;
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}
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ret = gpio_request(gpio, "i2c-bus");
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if (ret) {
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dev_err(i2c->dev, "gpio [%d] request failed\n", gpio);
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goto free_gpio;
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}
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}
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return 0;
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free_gpio:
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while (--idx >= 0)
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gpio_free(i2c->gpios[idx]);
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return -EINVAL;
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}
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static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
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{
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unsigned int idx;
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for (idx = 0; idx < 2; idx++)
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gpio_free(i2c->gpios[idx]);
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}
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#else
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static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
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{
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return -EINVAL;
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}
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static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
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{
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}
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#endif
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/* s3c24xx_i2c_init
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*
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* initialise the controller, set the IO lines and frequency
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@ -761,6 +813,9 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
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if (pdata->cfg_gpio)
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pdata->cfg_gpio(to_platform_device(i2c->dev));
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else
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if (s3c24xx_i2c_parse_dt_gpio(i2c))
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return -EINVAL;
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/* write slave address */
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@ -786,6 +841,34 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
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return 0;
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}
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#ifdef CONFIG_OF
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/* s3c24xx_i2c_parse_dt
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*
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* Parse the device tree node and retreive the platform data.
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*/
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static void
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s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
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{
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struct s3c2410_platform_i2c *pdata = i2c->pdata;
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if (!np)
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return;
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pdata->bus_num = -1; /* i2c bus number is dynamically assigned */
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of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay);
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of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr);
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of_property_read_u32(np, "samsung,i2c-max-bus-freq",
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(u32 *)&pdata->frequency);
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}
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#else
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static void
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s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
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{
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return;
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}
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#endif
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/* s3c24xx_i2c_probe
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*
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* called by the bus driver when a suitable device is found
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@ -798,10 +881,12 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
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struct resource *res;
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int ret;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data\n");
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return -EINVAL;
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if (!pdev->dev.of_node) {
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data\n");
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return -EINVAL;
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}
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}
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i2c = kzalloc(sizeof(struct s3c24xx_i2c), GFP_KERNEL);
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@ -818,6 +903,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
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if (pdata)
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memcpy(i2c->pdata, pdata, sizeof(*pdata));
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else
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s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c);
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strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
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i2c->adap.owner = THIS_MODULE;
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@ -914,6 +1001,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
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*/
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i2c->adap.nr = i2c->pdata->bus_num;
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i2c->adap.dev.of_node = pdev->dev.of_node;
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ret = i2c_add_numbered_adapter(&i2c->adap);
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if (ret < 0) {
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@ -921,6 +1009,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
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goto err_cpufreq;
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}
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of_i2c_register_devices(&i2c->adap);
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platform_set_drvdata(pdev, i2c);
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dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
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@ -969,6 +1058,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
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iounmap(i2c->regs);
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release_resource(i2c->ioarea);
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s3c24xx_i2c_dt_gpio_free(i2c);
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kfree(i2c->ioarea);
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kfree(i2c);
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@ -1022,6 +1112,17 @@ static struct platform_device_id s3c24xx_driver_ids[] = {
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};
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MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
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#ifdef CONFIG_OF
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static const struct of_device_id s3c24xx_i2c_match[] = {
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{ .compatible = "samsung,s3c2410-i2c" },
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{ .compatible = "samsung,s3c2440-i2c" },
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{},
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};
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MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
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#else
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#define s3c24xx_i2c_match NULL
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#endif
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static struct platform_driver s3c24xx_i2c_driver = {
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.probe = s3c24xx_i2c_probe,
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.remove = s3c24xx_i2c_remove,
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@ -1030,6 +1131,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
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.owner = THIS_MODULE,
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.name = "s3c-i2c",
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.pm = S3C24XX_DEV_PM_OPS,
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.of_match_table = s3c24xx_i2c_match,
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},
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};
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