This patch adds devicetree support for the MC13XXX LED driver.
Signed-off-by: Alexander Shiyan <shc_work@xxxxxxx>
---
Documentation/devicetree/bindings/mfd/mc13xxx.txt | 47 ++++++++
drivers/leds/leds-mc13783.c | 134 +++++++++++++++++++---
2 files changed, 162 insertions(+), 19 deletions(-)
diff --git a/Documentation/devicetree/bindings/mfd/mc13xxx.txt b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
index abd9e3c..1413f39 100644
--- a/Documentation/devicetree/bindings/mfd/mc13xxx.txt
+++ b/Documentation/devicetree/bindings/mfd/mc13xxx.txt
@@ -10,9 +10,44 @@ Optional properties:
- fsl,mc13xxx-uses-touch : Indicate the touchscreen controller is being used
Sub-nodes:
+- leds : Contain the led nodes and initial register values in property
+ "led-control". Number of register depends of used IC, for MC13783 is 6,
+ for MC13892 is 4, for MC34708 is 1. See datasheet for bits definitions of
+ these registers.
+ - #address-cells: Must be 1.
+ - #size-cells: Must be 0.
+ Each led node should contain "reg", which used as LED ID (described below).
+ Optional properties "label" and "linux,default-trigger" is described in
+ Documentation/devicetree/bindings/leds/common.txt.
- regulators : Contain the regulator nodes. The regulators are bound using
their names as listed below with their registers and bits for enabling.
+MC13783 LED IDs:
+ 0 : Main display
+ 1 : AUX display
+ 2 : Keypad
+ 3 : Red 1
+ 4 : Green 1
+ 5 : Blue 1
+ 6 : Red 2
+ 7 : Green 2
+ 8 : Blue 2
+ 9 : Red 3
+ 10 : Green 3
+ 11 : Blue 3
+
+MC13892 LED IDs:
+ 0 : Main display
+ 1 : AUX display
+ 2 : Keypad
+ 3 : Red
+ 4 : Green
+ 5 : Blue
+
+MC34708 LED IDs:
+ 0 : Charger Red
+ 1 : Charger Green
+
MC13783 regulators:
sw1a : regulator SW1A (register 24, bit 0)
sw1b : regulator SW1B (register 25, bit 0)
@@ -89,6 +124,18 @@ ecspi@70010000 { /* ECSPI1 */
interrupt-parent = <&gpio0>;
interrupts = <8>;
+ leds {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ led-control = <0x000 0x000 0x0e0 0x000>;
+
+ sysled {
+ reg = <3>;
+ label = "system:red:live";
+ linux,default-trigger = "heartbeat";
+ };
+ };
+
regulators {
sw1_reg: mc13892__sw1 {
regulator-min-microvolt = <600000>;
diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
index 95b3dfb..d7387a9 100644
--- a/drivers/leds/leds-mc13783.c
+++ b/drivers/leds/leds-mc13783.c
@@ -20,6 +20,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
+#include <linux/of.h>
#include <linux/workqueue.h>
#include <linux/mfd/mc13xxx.h>
@@ -42,7 +43,7 @@ struct mc13xxx_leds {
struct mc13xxx *master;
struct mc13xxx_led_devtype *devtype;
int num_leds;
- struct mc13xxx_led led[0];
+ struct mc13xxx_led *led;
};
static unsigned int mc13xxx_max_brightness(int id)
@@ -120,6 +121,98 @@ static void mc13xxx_led_set(struct led_classdev *led_cdev,
schedule_work(&led->work);
}
+#ifdef CONFIG_OF
+static int __init mc13xxx_led_probe_dt(struct platform_device *pdev)
+{
+ struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+ struct mc13xxx *mcdev = leds->master;
+ struct device_node *parent, *child;
+ struct device *dev = &pdev->dev;
+ u32 *ctrls, init_led = 0;
+ int i, ret;
+
+ ctrls = devm_kzalloc(dev, leds->devtype->num_regs * sizeof(*ctrls),
+ GFP_KERNEL);
+ if (!ctrls)
+ return -ENOMEM;
+
+ of_node_get(dev->parent->of_node);
+ parent = of_find_node_by_name(dev->parent->of_node, "leds");
+ if (!parent) {
+ ret = -ENODATA;
+ goto out_node_put;
+ }
+
+ ret = of_property_read_u32_array(parent, "led-control", ctrls,
+ leds->devtype->num_regs);
+ if (ret)
+ goto out_node_put;
+
+ for (i = 0; i < leds->devtype->num_regs; i++) {
+ ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
+ ctrls[i]);
+ if (ret)
+ goto out_node_put;
+ }
+
+ leds->led = devm_kzalloc(dev, of_get_child_count(parent) *
+ sizeof(*leds->led), GFP_KERNEL);
+ if (!leds->led)
+ return -ENOMEM;
+
+ i = 0;
+
+ for_each_child_of_node(parent, child) {
+ u32 id;
+
+ if (of_property_read_u32(child, "reg", &id))
+ continue;
+
+ if (id > (leds->devtype->led_max - leds->devtype->led_min)) {
+ dev_warn(dev, "Invalid reg ID %i\n", id);
+ continue;
+ }
+
+ if (init_led & (1 << id)) {
+ dev_warn(dev, "LED %i already initialized\n", id);
+ continue;
+ }
+
+ leds->led[i].id = id + leds->devtype->led_min;
+ leds->led[i].leds = leds;
+ leds->led[i].cdev.name = of_get_property(child, "label", NULL);
+ leds->led[i].cdev.default_trigger =
+ of_get_property(child, "linux,default-trigger", NULL);
+ leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
+ leds->led[i].cdev.brightness_set = mc13xxx_led_set;
+ leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
+
+ INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
+
+ if (led_classdev_register(dev, &leds->led[i].cdev)) {
+ dev_warn(dev, "Failed to register LED %i\n", id);
+ continue;
+ }
+
+ init_led |= 1 << id;
+ i++;
+ };
+
+ leds->num_leds = i;
+ ret = (i > 0) ? 0 : -ENODATA;
+
+out_node_put:
+ of_node_put(parent);
+
+ return ret;
+}
+#else
+static inline int __init mc13xxx_led_probe_dt(struct platform_device *pdev)
+{
+ return -ENOTSUPP;
+}
+#endif
+
static int __init mc13xxx_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -128,32 +221,35 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
struct mc13xxx_led_devtype *devtype =
(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
struct mc13xxx_leds *leds;
- int i, id, num_leds, ret = -ENODATA;
+ int i, id, ret = -ENODATA;
u32 init_led = 0;
- if (!pdata) {
- dev_err(dev, "Missing platform data\n");
- return -ENODEV;
- }
-
- num_leds = pdata->num_leds;
-
- if ((num_leds < 1) ||
- (num_leds > (devtype->led_max - devtype->led_min + 1))) {
- dev_err(dev, "Invalid LED count %d\n", num_leds);
- return -EINVAL;
- }
-
- leds = devm_kzalloc(dev, num_leds * sizeof(struct mc13xxx_led) +
- sizeof(struct mc13xxx_leds), GFP_KERNEL);
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
if (!leds)
return -ENOMEM;
leds->devtype = devtype;
- leds->num_leds = num_leds;
leds->master = mcdev;
platform_set_drvdata(pdev, leds);
+ if (dev->parent->of_node)
+ return mc13xxx_led_probe_dt(pdev);
+ else if (!pdata)
+ return -ENODATA;
+
+ leds->num_leds = pdata->num_leds;
+
+ if ((leds->num_leds < 1) ||
+ (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
+ dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
+ return -EINVAL;
+ }
+
+ leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
+ GFP_KERNEL);
+ if (!leds->led)
+ return -ENOMEM;
+
for (i = 0; i < devtype->num_regs; i++) {
ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
pdata->led_control[i]);
@@ -161,7 +257,7 @@ static int __init mc13xxx_led_probe(struct platform_device *pdev)
return ret;
}
- for (i = 0; i < num_leds; i++) {
+ for (i = 0; i < leds->num_leds; i++) {
const char *name, *trig;
ret = -EINVAL;
--
1.8.3.2
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