[PATCH] leds: Add DT support for leds-pca9532

Roland Stigge
2012-06-16T14:10:51Z

This patch adds DT support for leds-pca9532.

Signed-off-by: Roland Stigge <stigge@antcom.de>

---
Documentation/devicetree/bindings/leds/leds-pca9532.txt | 43 ++++++++++++++
drivers/leds/leds-pca9532.c | 47 ++++++++++++++++
2 files changed, 90 insertions(+)

--- /dev/null
+++ linux-2.6/Documentation/devicetree/bindings/leds/leds-pca9532.txt
@@ -0,0 +1,43 @@
+NXP PCA9532 LED (incl. GPIO) controller
+
+Required properties:
+- compatible: must be "nxp,pca9532"
+- reg: I2C address
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Should be 2:
+ 1) pin number
+ 2) optional parameters:
+ - bit 0 specifies polarity (0 for normal, 1 for inverted)
+- nxp,typecodes: groups of 2 bits for each of the 16 pins:
+ 0: None
+ 1: LED
+ 2: Beep
+ 3: GPIO
+- nxp,statecodes: groups of 2 bits for each of the 16 pins:
+ 0: off
+ 1: on
+ 2: pwm0
+ 3: pwm1
+
+Optional properties:
+- nxp,psc: array of 2 numbers: PSC values for the two PWM channels (see datasheet)
+- nxp,pwm: array of 2 numbers: PWM values for the two PWM channels (see datasheet)
+
+Example:
+
+ pca9532: pca9532 at 60 {
+ compatible = "nxp,pca9532";
+ gpio-controller;
+ #gpio-cells = <2>;
+ nxp,typecodes = <0xffffffff>;
+ nxp,statecodes = <0x00000000>;
+ reg = <0x60>;
+ };
+
+ sd at 20098000 {
+ wp-gpios = <&pca9532 5 0>;
+ cd-gpios = <&pca9532 4 0>;
+ cd-inverted;
+ bus-width = <4>;
+ status = "okay";
+ };
--- linux-2.6.orig/drivers/leds/leds-pca9532.c
+++ linux-2.6/drivers/leds/leds-pca9532.c
@@ -21,6 +21,7 @@
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
#include <linux/gpio.h>
+#include <linux/of.h>

/* m = num_leds*/
#define PCA9532_REG_INPUT(i) ((i) >> 3)
@@ -444,6 +445,47 @@ exit:
return err;
}

+#ifdef CONFIG_OF
+static struct pca9532_platform_data *pca9532_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct pca9532_platform_data *pca9532_pdata;
+ u32 typecodes, statecodes;
+ u32 pwm[2];
+ u32 psc[2];
+ int i;
+
+ pca9532_pdata = devm_kzalloc(dev, sizeof(*pca9532_pdata), GFP_KERNEL);
+ if (!pca9532_pdata) {
+ dev_err(dev, "could not allocate memory for platform data\n");
+ return NULL;
+ }
+
+ if (!of_property_read_u32(np, "nxp,typecodes", &typecodes)) {
+ for (i = 0; i < 16; i++)
+ pca9532_pdata->leds[i].type =
+ (typecodes >> (2 * i)) & 0x3;
+ }
+ if (!of_property_read_u32(np, "nxp,statecodes", &statecodes)) {
+ for (i = 0; i < 16; i++)
+ pca9532_pdata->leds[i].state =
+ (statecodes >> (2 * i)) & 0x3;
+ }
+ if (!of_property_read_u32_array(np, "nxp,pwm", &pwm[0], 2)) {
+ for (i = 0; i < 2; i++)
+ pca9532_pdata->pwm[i] = pwm[i];
+ }
+ if (!of_property_read_u32_array(np, "nxp,psc", &psc[0], 2)) {
+ for (i = 0; i < 2; i++)
+ pca9532_pdata->psc[i] = psc[i];
+ }
+
+ pca9532_pdata->gpio_base = -1; /* dynamically assign gpio base */
+
+ return pca9532_pdata;
+}
+#endif
+
static int pca9532_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -451,6 +493,11 @@ static int pca9532_probe(struct i2c_clie
struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
int err;

+#ifdef CONFIG_OF
+ if (!pca9532_pdata && client->dev.of_node)
+ pca9532_pdata = pca9532_parse_dt(&client->dev);
+#endif
+
if (!pca9532_pdata)
return -EIO;