leds: leds-mc13783: Add devicetree support

This patch adds devicetree support for the MC13XXX LED driver.

(cooloney@gmail.com: remove unneeded semicolon)

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Alexander Shiyan 2014-01-31 22:37:23 -08:00 committed by Bryan Wu
parent 2f18f8d638
commit 25c6579f87
2 changed files with 140 additions and 19 deletions

View File

@ -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>;

View File

@ -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 +121,74 @@ static void mc13xxx_led_set(struct led_classdev *led_cdev,
schedule_work(&led->work);
}
#ifdef CONFIG_OF
static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
struct platform_device *pdev)
{
struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
struct mc13xxx_leds_platform_data *pdata;
struct device_node *parent, *child;
struct device *dev = &pdev->dev;
int i = 0, ret = -ENODATA;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
of_node_get(dev->parent->of_node);
parent = of_find_node_by_name(dev->parent->of_node, "leds");
if (!parent)
goto out_node_put;
ret = of_property_read_u32_array(parent, "led-control",
pdata->led_control,
leds->devtype->num_regs);
if (ret)
goto out_node_put;
pdata->num_leds = of_get_child_count(parent);
pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
GFP_KERNEL);
if (!pdata->led) {
ret = -ENOMEM;
goto out_node_put;
}
for_each_child_of_node(parent, child) {
const char *str;
u32 tmp;
if (of_property_read_u32(child, "reg", &tmp))
continue;
pdata->led[i].id = leds->devtype->led_min + tmp;
if (!of_property_read_string(child, "label", &str))
pdata->led[i].name = str;
if (!of_property_read_string(child, "linux,default-trigger",
&str))
pdata->led[i].default_trigger = str;
i++;
}
pdata->num_leds = i;
ret = i > 0 ? 0 : -ENODATA;
out_node_put:
of_node_put(parent);
return ret ? ERR_PTR(ret) : pdata;
}
#else
static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
struct platform_device *pdev)
{
return ERR_PTR(-ENOSYS);
}
#endif
static int __init mc13xxx_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -128,32 +197,37 @@ 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) {
pdata = mc13xxx_led_probe_dt(pdev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
} 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 +235,7 @@ 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;