G'day Jacek,
Thanks for the feedback.
On 6/04/2016 3:56 PM, Jacek Anaszewski wrote:
Hi Phil,
Thanks for the patch. Please find my comments below.
On 04/06/2016 05:10 AM, Phil Reid wrote:
This patch adds basic device tree support for the pca9532 LEDs.
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/leds/leds-pca9532.txt | 32 +++++++++++
drivers/leds/leds-pca9532.c | 63 ++++++++++++++++++++--
include/dt-bindings/leds/leds-pca9532.h | 18 +++++++
include/linux/leds-pca9532.h | 8 ++-
4 files changed, 112 insertions(+), 9 deletions(-)
create mode 100644 Documentation/devicetree/bindings/leds/leds-pca9532.txt
create mode 100644 include/dt-bindings/leds/leds-pca9532.h
diff --git a/Documentation/devicetree/bindings/leds/leds-pca9532.txt b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
new file mode 100644
index 0000000..b48c223
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
@@ -0,0 +1,32 @@
+*NXP - pca9532 PWM LED Driver
+
+The PCA9532 family is SMBus I/O expander optimized for dimming LEDs.
+The PWM support 256 steps.
+
+Required properties:
+ - compatible:
+ "nxp,pca9530"
+ "nxp,pca9531"
+ "nxp,pca9532"
+ "nxp,pca9533"
+ - reg - I2C slave address
+
+Each led is represented as a sub-node of the nxp,pca9530.
+
+LED sub-node properties:
+- type: Output configuration
+ 0 = NONE, 1 = LED, 2 = N2100_BEEP, 3 = GPIO
+
+Example:
+
+ ledBL: pca9530@60 {
I think that ledBL label is here by mistake. It looks like this
label's purpose was to describe LED color (BL -> blue), but
this info should be conveyed by child node name, per which
LED class devices are created.
I'll clean this up.
+ compatible = "nxp,pca9530";
+ reg = <0x60>;
+
+ led0 {
i.e. here. Moreover there is established LED device naming
convention (see Documentation/leds/leds-class.txt):
devicename:colour:function
Ok.
+ type = <PCA9532_TYPE_LED>;
Please add "#include <dt-bindings/leds/leds-pca9532.h>" after
"Example:" above.
Ok.
+ };
+ };
+
+For more product information please see the link below:
+http://nxp.com/documents/data_sheet/PCA9532.pdf
diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
index e3d3b1a..8694c83 100644
--- a/drivers/leds/leds-pca9532.c
+++ b/drivers/leds/leds-pca9532.c
@@ -21,6 +21,8 @@
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
/* m = num_leds*/
#define PCA9532_REG_INPUT(i) ((i) >> 3)
@@ -86,9 +88,22 @@ static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
},
};
+#ifdef CONFIG_OF
+static const struct of_device_id of_pca9532_leds_match[] = {
+ { .compatible = "nxp,pca9530", .data = (void *)pca9530 },
+ { .compatible = "nxp,pca9531", .data = (void *)pca9531 },
+ { .compatible = "nxp,pca9532", .data = (void *)pca9532 },
+ { .compatible = "nxp,pca9533", .data = (void *)pca9533 },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
+#endif
+
static struct i2c_driver pca9532_driver = {
.driver = {
.name = "leds-pca953x",
+ .of_match_table = of_match_ptr(of_pca9532_leds_match),
},
.probe = pca9532_probe,
.remove = pca9532_remove,
@@ -432,15 +447,55 @@ exit:
return err;
}
+struct pca9532_platform_data *pca9532_of_populate_pdata(struct device *dev,
+ struct device_node *np)
+{
+ struct pca9532_platform_data *pdata;
+ struct device_node *child;
+ int devid = (int)of_match_device(of_pca9532_leds_match, dev)->data;
+ int maxleds = pca9532_chip_info_tbl[devid].num_leds;
+ int i = 0;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ for_each_child_of_node(np, child) {
+ of_property_read_string(child, "name", &pdata->leds[i].name);
Please use "label" property (see Documentation/devicetree/binding
/leds/common.txt). If not present use child node name. You can refer
to other LED class devices.
Ok.
+ of_property_read_u32(child, "type", &pdata->leds[i].type);
+ if (!pdata->leds[i].name)
+ pdata->leds[i].name = "?";
+ if (i >= maxleds)
+ break;
You have to call of_node_put if breaking this loop.
Ok. Also I forgot to increment i, my system only has one LED on the PCA9530.
+ }
+
+ return pdata;
+}
+
static int pca9532_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ int devid;
struct pca9532_data *data = i2c_get_clientdata(client);
struct pca9532_platform_data *pca9532_pdata =
dev_get_platdata(&client->dev);
-
- if (!pca9532_pdata)
- return -EIO;
+ struct device_node *np = client->dev.of_node;
+
+ if (!pca9532_pdata) {
+ if (np) {
+ pca9532_pdata =
+ pca9532_of_populate_pdata(&client->dev, np);
+ if (IS_ERR(pca9532_pdata))
+ return PTR_ERR(pca9532_pdata);
+ } else {
+ dev_err(&client->dev, "no platform data\n");
+ return -EINVAL;
+ }
+ devid = (int)of_match_device(
+ of_pca9532_leds_match, &client->dev)->data;
+ } else {
+ devid = id->driver_data;
+ }
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA))
@@ -450,7 +505,7 @@ static int pca9532_probe(struct i2c_client *client,
if (!data)
return -ENOMEM;
- data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
+ data->chip_info = &pca9532_chip_info_tbl[devid];
dev_info(&client->dev, "setting platform data\n");
i2c_set_clientdata(client, data);
diff --git a/include/dt-bindings/leds/leds-pca9532.h b/include/dt-bindings/leds/leds-pca9532.h
new file mode 100644
index 0000000..4d917aa
--- /dev/null
+++ b/include/dt-bindings/leds/leds-pca9532.h
@@ -0,0 +1,18 @@
+/*
+ * This header provides constants for pca9532 LED bindings.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _DT_BINDINGS_LEDS_PCA9532_H
+#define _DT_BINDINGS_LEDS_PCA9532_H
+
+#define PCA9532_TYPE_NONE 0
+#define PCA9532_TYPE_LED 1
+#define PCA9532_TYPE_N2100_BEEP 2
+#define PCA9532_TYPE_GPIO 3
+#define PCA9532_LED_TIMER2 4
+
+#endif /* _DT_BINDINGS_LEDS_PCA9532_H */
diff --git a/include/linux/leds-pca9532.h b/include/linux/leds-pca9532.h
index b8d6fff..4970f51 100644
--- a/include/linux/leds-pca9532.h
+++ b/include/linux/leds-pca9532.h
@@ -16,6 +16,7 @@
#include <linux/leds.h>
#include <linux/workqueue.h>
+#include <dt-bindings/leds/leds-pca9532.h>
enum pca9532_state {
PCA9532_OFF = 0x0,
@@ -24,16 +25,13 @@ enum pca9532_state {
PCA9532_PWM1 = 0x3
};
-enum pca9532_type { PCA9532_TYPE_NONE, PCA9532_TYPE_LED,
- PCA9532_TYPE_N2100_BEEP, PCA9532_TYPE_GPIO };
-
struct pca9532_led {
u8 id;
struct i2c_client *client;
- char *name;
+ const char *name;
struct led_classdev ldev;
struct work_struct work;
- enum pca9532_type type;
+ u32 type;
enum pca9532_state state;
};
--
Regards
Phil Reid
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