max8903: adds support for initiation via device tree

Adds support for device tree to setup a max8903 battery charger. DC and USB
validity are determined by looking the presence of the dok and uok gpios.

Signed-off-by: Chris Lapa <chris@lapa.com.au>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 72 insertions, 6 deletions

diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
index 9453bbff6075..fdc73d686153 100644
--- a/drivers/power/max8903_charger.c
+++ b/drivers/power/max8903_charger.c
@@ -23,6 +23,9 @@
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <linux/power_supply.h>
 #include <linux/platform_device.h>
@@ -75,6 +78,7 @@ static int max8903_get_property(struct power_supply *psy,
         default:
                 return -EINVAL;
         }
+
         return 0;
 }
 
@@ -179,6 +183,56 @@ static irqreturn_t max8903_fault(int irq, void *_data)
         return IRQ_HANDLED;
 }
 
+static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
+{
+        struct device_node *np = dev->of_node;
+        struct max8903_pdata *pdata = NULL;
+
+        if (!np)
+                return NULL;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return NULL;
+
+        pdata->dc_valid = false;
+        pdata->usb_valid = false;
+
+        pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
+        if (!gpio_is_valid(pdata->cen))
+                pdata->cen = -EINVAL;
+
+        pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
+        if (!gpio_is_valid(pdata->chg))
+                pdata->chg = -EINVAL;
+
+        pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
+        if (!gpio_is_valid(pdata->flt))
+                pdata->flt = -EINVAL;
+
+        pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
+        if (!gpio_is_valid(pdata->usus))
+                pdata->usus = -EINVAL;
+
+        pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
+        if (!gpio_is_valid(pdata->dcm))
+                pdata->dcm = -EINVAL;
+
+        pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
+        if (!gpio_is_valid(pdata->dok))
+                pdata->dok = -EINVAL;
+        else
+                pdata->dc_valid = true;
+
+        pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
+        if (!gpio_is_valid(pdata->uok))
+                pdata->uok = -EINVAL;
+        else
+                pdata->usb_valid = true;
+
+        return pdata;
+}
+
 static int max8903_setup_gpios(struct platform_device *pdev)
 {
         struct max8903_data *data = platform_get_drvdata(pdev);
@@ -298,16 +352,20 @@ static int max8903_probe(struct platform_device *pdev)
         struct power_supply_config psy_cfg = {};
         int ret = 0;
 
-        if (pdata == NULL) {
-                dev_err(dev, "No platform data.\n");
-                return -EINVAL;
-        }
-
         data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
-        data->pdata = pdev->dev.platform_data;
+        if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
+                pdata = max8903_parse_dt_data(dev);
+
+        if (!pdata) {
+                dev_err(dev, "No platform data.\n");
+                return -EINVAL;
+        }
+
+        pdev->dev.platform_data = pdata;
+        data->pdata = pdata;
         data->dev = dev;
         platform_set_drvdata(pdev, data);
 
@@ -328,6 +386,7 @@ static int max8903_probe(struct platform_device *pdev)
         data->psy_desc.properties = max8903_charger_props;
         data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
 
+        psy_cfg.of_node = dev->of_node;
         psy_cfg.drv_data = data;
 
         data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
@@ -378,10 +437,17 @@ static int max8903_probe(struct platform_device *pdev)
         return 0;
 }
 
+static const struct of_device_id max8903_match_ids[] = {
+        { .compatible = "maxim,max8903", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, max8903_match_ids);
+
 static struct platform_driver max8903_driver = {
         .probe  = max8903_probe,
         .driver = {
                 .name   = "max8903-charger",
+                .of_match_table = max8903_match_ids
         },
 };