backlight: lp855x: add a device tree structure
Enable supporting the DT structure of LP855x family devices. If the platform data is NULL, the driver tries to parse a DT structure. Then, the platform data is copied from the DT. Documentation is added as well. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kim, Milo
Linus Torvalds
parent
c365e59d47
commit
4add06645a
2 changed files with 112 additions and 2 deletions
41
Documentation/devicetree/bindings/video/backlight/lp855x.txt
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41
Documentation/devicetree/bindings/video/backlight/lp855x.txt
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@ -0,0 +1,41 @@
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lp855x bindings
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Required properties:
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- compatible: "ti,lp8550", "ti,lp8551", "ti,lp8552", "ti,lp8553",
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"ti,lp8556", "ti,lp8557"
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- reg: I2C slave address (u8)
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- dev-ctrl: Value of DEVICE CONTROL register (u8). It depends on the device.
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Optional properties:
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- bl-name: Backlight device name (string)
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- init-brt: Initial value of backlight brightness (u8)
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- pwm-period: PWM period value. Set only PWM input mode used (u32)
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- rom-addr: Register address of ROM area to be updated (u8)
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- rom-val: Register value to be updated (u8)
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Example:
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/* LP8556 */
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backlight@2c {
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compatible = "ti,lp8556";
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reg = <0x2c>;
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bl-name = "lcd-bl";
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dev-ctrl = /bits/ 8 <0x85>;
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init-brt = /bits/ 8 <0x10>;
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};
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/* LP8557 */
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backlight@2c {
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compatible = "ti,lp8557";
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reg = <0x2c>;
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dev-ctrl = /bits/ 8 <0x41>;
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init-brt = /bits/ 8 <0x0a>;
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/* 4V OV, 4 output LED string enabled */
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rom_14h {
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rom-addr = /bits/ 8 <0x14>;
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rom-val = /bits/ 8 <0xcf>;
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};
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};
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@ -14,6 +14,7 @@
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#include <linux/i2c.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/platform_data/lp855x.h>
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#include <linux/pwm.h>
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@ -338,15 +339,71 @@ static const struct attribute_group lp855x_attr_group = {
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.attrs = lp855x_attributes,
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};
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#ifdef CONFIG_OF
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static int lp855x_parse_dt(struct device *dev, struct device_node *node)
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{
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struct lp855x_platform_data *pdata;
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int rom_length;
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if (!node) {
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dev_err(dev, "no platform data\n");
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return -EINVAL;
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}
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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of_property_read_string(node, "bl-name", &pdata->name);
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of_property_read_u8(node, "dev-ctrl", &pdata->device_control);
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of_property_read_u8(node, "init-brt", &pdata->initial_brightness);
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of_property_read_u32(node, "pwm-period", &pdata->period_ns);
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/* Fill ROM platform data if defined */
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rom_length = of_get_child_count(node);
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if (rom_length > 0) {
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struct lp855x_rom_data *rom;
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struct device_node *child;
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int i = 0;
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rom = devm_kzalloc(dev, sizeof(*rom) * rom_length, GFP_KERNEL);
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if (!rom)
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return -ENOMEM;
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for_each_child_of_node(node, child) {
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of_property_read_u8(child, "rom-addr", &rom[i].addr);
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of_property_read_u8(child, "rom-val", &rom[i].val);
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i++;
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}
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pdata->size_program = rom_length;
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pdata->rom_data = &rom[0];
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}
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dev->platform_data = pdata;
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return 0;
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}
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#else
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static int lp855x_parse_dt(struct device *dev, struct device_node *node)
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{
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return -EINVAL;
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}
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#endif
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static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
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{
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struct lp855x *lp;
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struct lp855x_platform_data *pdata = cl->dev.platform_data;
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struct device_node *node = cl->dev.of_node;
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int ret;
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if (!pdata) {
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dev_err(&cl->dev, "no platform data supplied\n");
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return -EINVAL;
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ret = lp855x_parse_dt(&cl->dev, node);
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if (ret < 0)
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return ret;
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pdata = cl->dev.platform_data;
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}
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if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
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@ -408,6 +465,17 @@ static int lp855x_remove(struct i2c_client *cl)
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return 0;
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}
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static const struct of_device_id lp855x_dt_ids[] = {
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{ .compatible = "ti,lp8550", },
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{ .compatible = "ti,lp8551", },
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{ .compatible = "ti,lp8552", },
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{ .compatible = "ti,lp8553", },
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{ .compatible = "ti,lp8556", },
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{ .compatible = "ti,lp8557", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, lp855x_dt_ids);
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static const struct i2c_device_id lp855x_ids[] = {
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{"lp8550", LP8550},
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{"lp8551", LP8551},
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@ -422,6 +490,7 @@ MODULE_DEVICE_TABLE(i2c, lp855x_ids);
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static struct i2c_driver lp855x_driver = {
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.driver = {
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.name = "lp855x",
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.of_match_table = of_match_ptr(lp855x_dt_ids),
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},
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.probe = lp855x_probe,
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.remove = lp855x_remove,
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