mfd: Enable the tc3589x for Device Tree

Here we provide a means to probe and extract vital information
from Device Tree when booting with it enabled. Without this
patch sub-devices wouldn't be able to reference the tc3589x
from Device Tree.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/tc3589x.c b/drivers/mfd/tc3589x.c
index 2df44ac..8f4c853 100644 (file)
--- a/drivers/mfd/tc3589x.c
+++ b/drivers/mfd/tc3589x.c
@@ -12,6 +12,7 @@
 #include <linux/irqdomain.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
+#include <linux/of.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/tc3589x.h>
 
@@ -146,6 +147,7 @@ static struct mfd_cell tc3589x_dev_gpio[] = {
                .name           = "tc3589x-gpio",
                .num_resources  = ARRAY_SIZE(gpio_resources),
                .resources      = &gpio_resources[0],
+               .of_compatible  = "tc3589x-gpio",
        },
 };
 
@@ -154,6 +156,7 @@ static struct mfd_cell tc3589x_dev_keypad[] = {
                .name           = "tc3589x-keypad",
                .num_resources  = ARRAY_SIZE(keypad_resources),
                .resources      = &keypad_resources[0],
+               .of_compatible  = "tc3589x-keypad",
        },
 };
 
@@ -221,7 +224,7 @@ static struct irq_domain_ops tc3589x_irq_ops = {
         .xlate  = irq_domain_xlate_twocell,
 };
 
-static int tc3589x_irq_init(struct tc3589x *tc3589x)
+static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
 {
        int base = tc3589x->irq_base;
 
@@ -232,7 +235,7 @@ static int tc3589x_irq_init(struct tc3589x *tc3589x)
        }
        else {
                tc3589x->domain = irq_domain_add_linear(
-                       NULL, TC3589x_NR_INTERNAL_IRQS,
+                       np, TC3589x_NR_INTERNAL_IRQS,
                        &tc3589x_irq_ops, tc3589x);
        }
 
@@ -309,13 +312,47 @@ static int __devinit tc3589x_device_init(struct tc3589x *tc3589x)
        return ret;
 }
 
+static int tc3589x_of_probe(struct device_node *np,
+                       struct tc3589x_platform_data *pdata)
+{
+       struct device_node *child;
+
+       for_each_child_of_node(np, child) {
+               if (!strcmp(child->name, "tc3589x_gpio")) {
+                       pdata->block |= TC3589x_BLOCK_GPIO;
+               }
+               if (!strcmp(child->name, "tc3589x_keypad")) {
+                       pdata->block |= TC3589x_BLOCK_KEYPAD;
+               }
+       }
+
+       return 0;
+}
+
 static int __devinit tc3589x_probe(struct i2c_client *i2c,
                                   const struct i2c_device_id *id)
 {
        struct tc3589x_platform_data *pdata = i2c->dev.platform_data;
+       struct device_node *np = i2c->dev.of_node;
        struct tc3589x *tc3589x;
        int ret;
 
+       if (!pdata) {
+               if (np) {
+                       pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
+                       if (!pdata)
+                               return -ENOMEM;
+
+                       ret = tc3589x_of_probe(np, pdata);
+                       if (ret)
+                               return ret;
+               }
+               else {
+                       dev_err(&i2c->dev, "No platform data or DT found\n");
+                       return -EINVAL;
+               }
+       }
+
        if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
                                     | I2C_FUNC_SMBUS_I2C_BLOCK))
                return -EIO;
@@ -338,7 +375,7 @@ static int __devinit tc3589x_probe(struct i2c_client *i2c,
        if (ret)
                goto out_free;
 
-       ret = tc3589x_irq_init(tc3589x);
+       ret = tc3589x_irq_init(tc3589x, np);
        if (ret)
                goto out_free;