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Subject[PATCH 3/3] mfd: lm3533: Support initialization from Device Tree
Date
Implement Device Tree parsing functions to support initialization of the
lm3533 drivers.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
---
drivers/mfd/lm3533-core.c | 265 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 265 insertions(+)

diff --git a/drivers/mfd/lm3533-core.c b/drivers/mfd/lm3533-core.c
index 5abcbb2e8849..acdb3d580277 100644
--- a/drivers/mfd/lm3533-core.c
+++ b/drivers/mfd/lm3533-core.c
@@ -18,6 +18,7 @@
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
+#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
@@ -25,6 +26,8 @@

#include <linux/mfd/lm3533.h>

+#define LM3533_DEFAULT_BRIGHTNESS 200

#define LM3533_BOOST_OVP_MASK 0x06
#define LM3533_BOOST_OVP_SHIFT 1
@@ -588,10 +591,266 @@ static const struct regmap_config regmap_config = {
.precious_reg = lm3533_precious_register,
};

+static int lm3533_of_parse_enum(struct device_node *node,
+ const char *propname,
+ const unsigned *match, size_t num_matches)
+{
+ size_t i;
+ int ret;
+ u32 val;
+
+ ret = of_property_read_u32(node, propname, &val);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < num_matches; i++) {
+ if (val == match[i])
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int lm3533_of_parse_pwm_zones(struct device_node *node)
+{
+ const char *propname = "ti,pwm-zones";
+ u32 zones[5];
+ int count;
+ int ret;
+ int i;
+
+ count = of_property_count_u32_elems(node, propname);
+ if (count == -EINVAL)
+ return 0;
+ if (count <= 0)
+ return count;
+ if (count >= ARRAY_SIZE(zones))
+ return -EINVAL;
+
+ ret = of_property_read_u32_array(node, propname, zones, count);
+ if (ret < 0)
+ return ret;
+
+ /* Enable pwm input, and enable the selected zones */
+ ret = BIT(0);
+ for (i = 0; i < count; i++)
+ ret |= BIT(zones[i] + 1);
+
+ return ret;
+}
+
+static int lm3533_of_parse_als_node(struct device *dev,
+ struct device_node *node,
+ struct lm3533_platform_data *pdata)
+{
+ struct lm3533_als_platform_data *als_pdata;
+ int ret;
+ u32 val;
+
+ als_pdata = devm_kzalloc(dev,
+ sizeof(struct lm3533_als_platform_data),
+ GFP_KERNEL);
+ if (!als_pdata)
+ return -ENOMEM;
+
+ als_pdata->pwm_mode = of_property_read_bool(node, "ti,pwm-mode");
+
+ ret = of_property_read_u32(node, "ti,als-resistance", &val);
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(dev, "unable to read ti,als-resistance");
+ return ret;
+ }
+
+ /* Leave at high-Z, if the property was omitted or specified as 0 */
+ if (!ret && val != 0)
+ als_pdata->r_select = 200000 / val;
+
+ pdata->als = als_pdata;
+
+ return 0;
+}
+
+static int lm3533_of_parse_bl_node(struct device *dev,
+ struct device_node *node,
+ struct lm3533_platform_data *pdata)
+{
+ struct lm3533_bl_platform_data *bl_pdata;
+ int ret;
+ u32 reg;
+ u32 val;
+
+ ret = of_property_read_u32(node, "reg", &reg);
+ if (ret < 0 || reg >= ARRAY_SIZE(lm3533_bl_devs)) {
+ dev_err(dev, "invalid reg property\n");
+ return ret;
+ }
+
+ bl_pdata = &pdata->backlights[reg];
+
+ /* Increment num_backlights if we're filling a new space */
+ if (reg + 1 > pdata->num_backlights)
+ pdata->num_backlights = reg + 1;
+
+ ret = of_property_read_string(node, "label",
+ (const char **)&bl_pdata->name);
+ if (ret < 0) {
+ dev_err(dev, "unable to parse label\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(node, "led-max-microamp", &val);
+ if (ret < 0) {
+ dev_err(dev, "unable to parse led-max-microamp\n");
+ return ret;
+ }
+ bl_pdata->max_current = val;
+
+ val = LM3533_DEFAULT_BRIGHTNESS;
+ ret = of_property_read_u32(node, "default-brightness", &val);
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(dev, "unable to parse default-brightness\n");
+ return ret;
+ }
+ bl_pdata->default_brightness = val;
+
+ ret = lm3533_of_parse_pwm_zones(node);
+ if (ret < 0) {
+ dev_err(dev, "failed to parse ti,pwm-zones\n");
+ return ret;
+ }
+ bl_pdata->pwm = ret;
+
+ return 0;
+}
+
+static int lm3533_of_parse_led_node(struct device *dev,
+ struct device_node *node,
+ struct lm3533_platform_data *pdata)
+{
+ struct lm3533_led_platform_data *led_pdata;
+ int ret;
+ u32 reg;
+ u32 val;
+
+ ret = of_property_read_u32(node, "reg", &reg);
+ if (ret < 0 || reg >= ARRAY_SIZE(lm3533_led_devs)) {
+ dev_err(dev, "invalid reg property\n");
+ return ret;
+ }
+
+ led_pdata = &pdata->leds[reg];
+
+ /* Increment num_leds if we're filling a new space */
+ if (reg + 1 > pdata->num_leds)
+ pdata->num_leds = reg + 1;
+
+ ret = of_property_read_string(node, "label",
+ (const char **)&led_pdata->name);
+ if (ret < 0) {
+ dev_err(dev, "unable to parse label\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(node, "led-max-microamp", &val);
+ if (ret < 0) {
+ dev_err(dev, "unable to parse led-max-microamp\n");
+ return ret;
+ }
+ led_pdata->max_current = val;
+
+ ret = of_property_read_string(node, "linux,default-trigger",
+ &led_pdata->default_trigger);
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(dev, "unable to parse default-trigger\n");
+ return ret;
+ }
+
+ ret = lm3533_of_parse_pwm_zones(node);
+ if (ret < 0) {
+ dev_err(dev, "failed to parse ti,pwm-zones\n");
+ return ret;
+ }
+ led_pdata->pwm = ret;
+
+ return 0;
+}
+
+static int lm3533_pdata_from_of_node(struct device *dev)
+{
+ struct lm3533_platform_data *pdata;
+ struct device_node *node;
+ int ret;
+ const unsigned freqs[] = {
+ [LM3533_BOOST_FREQ_500KHZ] = 500000,
+ [LM3533_BOOST_FREQ_1000KHZ] = 1000000,
+ };
+ const unsigned ovps[] = {
+ [LM3533_BOOST_OVP_16V] = 16,
+ [LM3533_BOOST_OVP_24V] = 24,
+ [LM3533_BOOST_OVP_32V] = 32,
+ [LM3533_BOOST_OVP_40V] = 40,
+ };
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->backlights = devm_kcalloc(dev,
+ ARRAY_SIZE(lm3533_bl_devs),
+ sizeof(struct lm3533_bl_platform_data),
+ GFP_KERNEL);
+ if (!pdata->backlights)
+ return -ENOMEM;
+
+ pdata->leds = devm_kcalloc(dev,
+ ARRAY_SIZE(lm3533_led_devs),
+ sizeof(struct lm3533_led_platform_data),
+ GFP_KERNEL);
+ if (!pdata->leds)
+ return -ENOMEM;
+
+ pdata->gpio_hwen = of_get_named_gpio(dev->of_node, "ti,hwen-gpios", 0);
+ if (pdata->gpio_hwen < 0)
+ return pdata->gpio_hwen;
+
+ ret = lm3533_of_parse_enum(dev->of_node, "ti,boost-freq", freqs, 2);
+ if (ret < 0) {
+ dev_err(dev, "failed to parse ti,boost-freq\n");
+ return ret;
+ }
+ pdata->boost_freq = ret;
+
+ ret = lm3533_of_parse_enum(dev->of_node, "ti,boost-ovp", ovps, 4);
+ if (ret < 0) {
+ dev_err(dev, "failed to parse ti,boost-ovp\n");
+ return ret;
+ }
+ pdata->boost_ovp = ret;
+
+ for_each_child_of_node(dev->of_node, node) {
+ if (!of_node_cmp(node->name, "als"))
+ ret = lm3533_of_parse_als_node(dev, node, pdata);
+ else if (!of_node_cmp(node->name, "backlight"))
+ ret = lm3533_of_parse_bl_node(dev, node, pdata);
+ else if (!of_node_cmp(node->name, "led"))
+ ret = lm3533_of_parse_led_node(dev, node, pdata);
+
+ if (ret < 0) {
+ of_node_put(node);
+ return ret;
+ }
+ }
+
+ dev->platform_data = pdata;
+
+ return 0;
+}
+
static int lm3533_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct lm3533 *lm3533;
+ int ret;

dev_dbg(&i2c->dev, "%s\n", __func__);

@@ -608,6 +867,12 @@ static int lm3533_i2c_probe(struct i2c_client *i2c,
lm3533->dev = &i2c->dev;
lm3533->irq = i2c->irq;

+ if (i2c->dev.of_node) {
+ ret = lm3533_pdata_from_of_node(lm3533->dev);
+ if (ret < 0)
+ return ret;
+ }
+
return lm3533_device_init(lm3533);
}

--
2.4.2


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