Hello,
On 12/21/2013 05:32 AM, Alexander Shiyan wrote:
> 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 {
compatible string?
> + #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;
This is not related to the DT conversion, so please roll out the change
into another patch.
> };
>
> 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]);
Code duplicated from the regular probe.
> + 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;convert to
> +
> + if (id > (leds->devtype->led_max - leds->devtype->led_min)) {
This is slightly changed from the original driver:
if ((id > devtype->led_max) || (id < devtype->led_min)) {
So if you feel that it is a bug, please provide a proper bug fix as a
separate patch.
> + 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);
> +
- The chunck above is just copy-pasted from the probe, so you end up
with a _ton_ of duplicated
code. Please do not do that.
- The original probe calls mc13xxx_led_setup() here. Why are you
removing this call?
> + 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;
ENODEV usually?
> +}
> +#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);
As said in my first comment, this is not related to the DT conversion.
> 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);
Why are you returning here? This is not a common way of doing the DT
conversion, as you end up
with a lot of duplicated code. Your mc13xxx_led_probe_dt() should
populate the missing fields
in your platform data, so that your probe logic remains untouched and
common to both logics.
> + 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;
>
Where is the of_match_table?
Regards,
Florian
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