gpio: pcf857x: Convert to DT mode

Signed-off-by: Archit Taneja <archit@ti.com>

diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index a19b7457a726e4c4f6a2c48a9c8c9a52e370dcff..a9e81d8f35e24aa656106b424680e8c4cc6c2915 100644 (file)
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -254,17 +254,42 @@ fail:
 
 /*-------------------------------------------------------------------------*/
 
+struct pcf857x_platform_data *of_gpio_pcf857x(struct device *dev)
+{
+       struct pcf857x_platform_data *pdata;
+       int r;
+
+       pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return NULL;
+
+       pdata->gpio_base = -1;
+
+       r = of_property_read_u32(dev->of_node, "n_latch", &pdata->n_latch);
+       if (r) {
+               dev_dbg(dev, "couldn't find n-latch, use default\n");
+               pdata->n_latch = ~0;
+       }
+
+       return pdata;
+}
+
 static int pcf857x_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
 {
        struct pcf857x_platform_data    *pdata;
+       struct device_node *node;
        struct pcf857x                  *gpio;
        int                             status;
 
        pdata = client->dev.platform_data;
-       if (!pdata) {
+       node = client->dev.of_node;
+
+       if (!pdata && node)
+               pdata = of_gpio_pcf857x(&client->dev);
+
+       if (!pdata)
                dev_dbg(&client->dev, "no platform data\n");
-       }
 
        /* Allocate, initialize, and register this gpio_chip. */
        gpio = kzalloc(sizeof *gpio, GFP_KERNEL);
@@ -422,10 +447,30 @@ static int pcf857x_remove(struct i2c_client *client)
        return status;
 }
 
+static const struct of_device_id pcf857x_dt_ids[] = {
+       { .compatible = "ti,pcf8574", },
+       { .compatible = "ti,pcf8574a", },
+       { .compatible = "ti,pca8574", },
+       { .compatible = "ti,pca9670", },
+       { .compatible = "ti,pca9672", },
+       { .compatible = "ti,pca9674", },
+       { .compatible = "ti,pcf8575", },
+       { .compatible = "ti,pca8575", },
+       { .compatible = "ti,pca9671", },
+       { .compatible = "ti,pca9673", },
+       { .compatible = "ti,pca9675", },
+       { .compatible = "ti,max7328", },
+       { .compatible = "ti,max7329", },
+       { }
+};
+
+MODULE_DEVICE_TABLE(of, pcf857x_dt_ids);
+
 static struct i2c_driver pcf857x_driver = {
        .driver = {
-               .name   = "pcf857x",
-               .owner  = THIS_MODULE,
+               .name           = "pcf857x",
+               .owner          = THIS_MODULE,
+               .of_match_table = pcf857x_dt_ids,
        },
        .probe  = pcf857x_probe,
        .remove = pcf857x_remove,