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Date: Tue, 7 May 2013 07:14:48 +0000
From: "Kim, Milo" <Milo.Kim@...com>
To: Bryan Wu <cooloney@...il.com>
CC: Linus Walleij <linus.walleij@...aro.org>,
Gabriel Fernandez <gabriel.fernandez@...ricsson.com>,
"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] leds: lp55xx: support dynamic channel settings in the
device tree structure
Currently, the LP55xx DT structure supports max 3 channels.
However, LP5523 has max 9 channels and LP5562 has 4 channels.
To enhance this constraint, the DT structure has been changed.
(a) Use the child node for various channel settings instead of fixed array
(b) Remove 'num_channel' property.
This value can be retrieved by counting the children node.
(c) 'chan-name' property supported
(d) Documentation updates for LP5521 and LP5523
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Gabriel Fernandez <gabriel.fernandez@...ricsson.com>
Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
---
.../devicetree/bindings/leds/leds-lp55xx.txt | 107 ++++++++++++++++++--
drivers/leds/leds-lp55xx-common.c | 61 +++++------
2 files changed, 126 insertions(+), 42 deletions(-)
diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
index 348c88e..a454088 100644
--- a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
+++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
@@ -2,20 +2,113 @@ Binding for National Semiconductor LP55xx Led Drivers
Required properties:
- compatible: "national,lp5521" or "national,lp5523"
-- label: Used for naming LEDs
-- num-channel: Number of LED channels
+- reg: I2C slave address
+- clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
+
+Each child has own specific current settings
- led-cur: Current setting at each led channel (mA x10, 0 if led is not connected)
- max-cur: Maximun current at each led channel.
-- clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
-example:
+Optional properties:
+- label: Used for naming LEDs
+
+Alternatively, each child can have specific channel name
+- chan-name: Name of each channel name
+
+example 1) LP5521
+3 LED channels, external clock used. Channel names are 'lp5521_pri:channel0',
+'lp5521_pri:channel1' and 'lp5521_pri:channel2'
lp5521@32 {
compatible = "national,lp5521";
reg = <0x32>;
label = "lp5521_pri";
- num-channel = /bits/ 8 <3>;
- led-cur = /bits/ 8 <0x2f 0x2f 0x2f>;
- max-cur = /bits/ 8 <0x5f 0x5f 0x5f>;
clock-mode = /bits/8 <2>;
+
+ chan0 {
+ led-cur = /bits/ 8 <0x2f>;
+ max-cur = /bits/ 8 <0x5f>;
+ };
+
+ chan1 {
+ led-cur = /bits/ 8 <0x2f>;
+ max-cur = /bits/ 8 <0x5f>;
+ };
+
+ chan2 {
+ led-cur = /bits/ 8 <0x2f>;
+ max-cur = /bits/ 8 <0x5f>;
+ };
+};
+
+example 2) LP5523
+9 LED channels with specific name. Internal clock used.
+The I2C slave address is configurable with ASEL1 and ASEL0 pins.
+Available addresses are 32/33/34/35h.
+
+ASEL1 ASEL0 Address
+-------------------------
+ GND GND 32h
+ GND VEN 33h
+ VEN GND 34h
+ VEN VEN 35h
+
+lp5523@32 {
+ compatible = "national,lp5523";
+ reg = <0x32>;
+ clock-mode = /bits/ 8 <1>;
+
+ chan0 {
+ chan-name = "d1";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan1 {
+ chan-name = "d2";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan2 {
+ chan-name = "d3";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan3 {
+ chan-name = "d4";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan4 {
+ chan-name = "d5";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan5 {
+ chan-name = "d6";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan6 {
+ chan-name = "d7";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan7 {
+ chan-name = "d8";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
+
+ chan8 {
+ chan-name = "d9";
+ led-cur = /bits/ 8 <0x14>;
+ max-cur = /bits/ 8 <0x20>;
+ };
};
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index a0d2bd2..c2fecd4 100644
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -557,51 +557,42 @@ EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
{
+ struct device_node *child;
struct lp55xx_platform_data *pdata;
- u8 led_cur[3];
- u8 max_cur[3];
- u8 clock_mode;
- u8 num_channel;
- const char *label;
- struct lp55xx_led_config *led_config;
- int ret;
- int i;
+ struct lp55xx_led_config *cfg;
+ int num_channels;
+ int i = 0;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- ret = of_property_read_u8(np, "num-channel", &num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
- if (ret < 0)
- return ret;
- ret = of_property_read_string(np, "label", &label);
- if (ret < 0)
- return ret;
- ret = of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
- if (ret < 0)
- return ret;
+ num_channels = of_get_child_count(np);
+ if (num_channels == 0) {
+ dev_err(dev, "no LED channels\n");
+ return -EINVAL;
+ }
- led_config = devm_kzalloc(dev, sizeof(*led_config) * num_channel,
- GFP_KERNEL);
- if (!led_config)
+ cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL);
+ if (!cfg)
return -ENOMEM;
- for (i = 0; i < num_channel; i++) {
- led_config[i].chan_nr = i;
- led_config[i].led_current = led_cur[i];
- led_config[i].max_current = max_cur[i];
+ pdata->led_config = &cfg[0];
+ pdata->num_channels = num_channels;
+
+ for_each_child_of_node(np, child) {
+ cfg[i].chan_nr = i;
+
+ of_property_read_string(child, "chan-name", &cfg[i].name);
+ of_property_read_u8(child, "led-cur", &cfg[i].led_current);
+ of_property_read_u8(child, "max-cur", &cfg[i].max_current);
+
+ i++;
}
- pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
- strcpy((char *)pdata->label, (char *) label);
- pdata->led_config = &led_config[0];
- pdata->num_channels = num_channel;
- pdata->clock_mode = clock_mode;
+
+ of_property_read_string(np, "label", &pdata->label);
+ of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
+
dev->platform_data = pdata;
return 0;
--
1.7.9.5
Best Regards,
Milo
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