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Date: Thu, 20 Apr 2023 17:49:24 +0530
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Lee Jones <lee@...nel.org>
Cc: Pavel Machek <pavel@....cz>,
Patrick Rudolph <patrick.rudolph@...ements.com>,
linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v5] leds: max597x: Add support for max597x
Hi Lee,
On 20-04-2023 05:20 pm, Lee Jones wrote:
> On Mon, 17 Apr 2023, Naresh Solanki wrote:
>
>> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>>
>> max597x is hot swap controller with indicator LED support.
>> This driver uses DT property to configure led during boot time &
>> also provide the LED control in sysfs.
>>
>> DTS example:
>> i2c {
>> #address-cells = <1>;
>> #size-cells = <0>;
>> regulator@3a {
>> compatible = "maxim,max5978";
>> reg = <0x3a>;
>> vss1-supply = <&p3v3>;
>>
>> regulators {
>> sw0_ref_0: sw0 {
>> shunt-resistor-micro-ohms = <12000>;
>> };
>> };
>>
>> leds {
>> #address-cells = <1>;
>> #size-cells = <0>;
>> led@0 {
>> reg = <0>;
>> label = "ssd0:green";
>> default-state = "on";
>> };
>> led@1 {
>> reg = <1>;
>> label = "ssd1:green";
>> default-state = "on";
>> };
>> };
>> };
>> };
>
> Where is the DT binding document for this?
>
>> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>> ...
>> Changes in V5:
>> - Update commit message
>> - Fix comments
>> - Add necessary new line
>> Changes in V4:
>> - Remove unwanted preinitialise
>> - Remove unneeded line breaks
>> - Fix variable name to avoid confusion
>> - Update module description to mention LED driver.
>> Changes in V3:
>> - Remove of_node_put as its handled by for loop
>> - Print error if an LED fails to register.
>> - Update driver name in Kconfig description
>> - Remove unneeded variable assignment
>> - Use devm_led_classdev_register to reget led
>> Changes in V2:
>> - Fix regmap update
>> - Remove devm_kfree
>> - Remove default-state
>> - Add example dts in commit message
>> - Fix whitespace in Kconfig
>> - Fix comment
>> ---
>> drivers/leds/Kconfig | 11 ++++
>> drivers/leds/Makefile | 1 +
>> drivers/leds/leds-max597x.c | 115 ++++++++++++++++++++++++++++++++++++
>> 3 files changed, 127 insertions(+)
>> create mode 100644 drivers/leds/leds-max597x.c
>>
>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>> index 9dbce09eabac..60004cb8c257 100644
>> --- a/drivers/leds/Kconfig
>> +++ b/drivers/leds/Kconfig
>> @@ -590,6 +590,17 @@ config LEDS_ADP5520
>> To compile this driver as a module, choose M here: the module will
>> be called leds-adp5520.
>>
>> +config LEDS_MAX597X
>> + tristate "LED Support for Maxim 597x"
>> + depends on LEDS_CLASS
>> + depends on MFD_MAX597X
>> + help
>> + This option enables support for the Maxim MAX5970 & MAX5978 smart
>> + switch indication LEDs via the I2C bus.
>> +
>> + To compile this driver as a module, choose M here: the module will
>> + be called leds-max597x.
>> +
>> config LEDS_MC13783
>> tristate "LED Support for MC13XXX PMIC"
>> depends on LEDS_CLASS
>> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
>> index d30395d11fd8..da1192e40268 100644
>> --- a/drivers/leds/Makefile
>> +++ b/drivers/leds/Makefile
>> @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
>> obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
>> obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
>> obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
>> +obj-$(CONFIG_LEDS_MAX597X) += leds-max597x.o
>> obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
>> obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
>> obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
>> diff --git a/drivers/leds/leds-max597x.c b/drivers/leds/leds-max597x.c
>> new file mode 100644
>> index 000000000000..edbd43018822
>> --- /dev/null
>> +++ b/drivers/leds/leds-max597x.c
>> @@ -0,0 +1,115 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Device driver for leds in MAX5970 and MAX5978 IC
>
> "MAX5970 and MAX5978 IC LED support"
>
>> + * Copyright (c) 2022 9elements GmbH
>> + *
>> + * Author: Patrick Rudolph <patrick.rudolph@...ements.com>
>> + */
>> +
>> +#include <linux/leds.h>
>> +#include <linux/mfd/max597x.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +
>> +#define ldev_to_maxled(c) container_of(c, struct max597x_led, cdev)
>> +
>> +struct max597x_led {
>> + struct regmap *regmap;
>> + struct led_classdev cdev;
>> + unsigned int index;
>> +};
>> +
>> +static int max597x_led_set_brightness(struct led_classdev *cdev,
>> + enum led_brightness brightness)
>> +{
>> + struct max597x_led *ddata = ldev_to_maxled(cdev);
>> + int ret, val;
>> +
>> + if (!ddata->regmap)
>> + return -ENODEV;
>> +
>> + /* Set/clear corresponding bit for given led index */
>> + val = !brightness ? BIT(ddata->index) : 0;
>> +
>> + ret = regmap_update_bits(ddata->regmap, MAX5970_REG_LED_FLASH, BIT(ddata->index), val);
>> + if (ret < 0)
>> + dev_err(cdev->dev, "failed to set brightness %d", ret);
>> +
>> + return ret;
>> +}
>> +
>> +static int max597x_setup_led(struct device *dev, struct regmap *regmap, struct device_node *nc,
>> + u32 reg)
>> +{
>> + struct max597x_led *ddata;
>> + int ret;
>> +
>> + ddata = devm_kzalloc(dev, sizeof(struct max597x_led), GFP_KERNEL);
>> + if (!ddata)
>> + return -ENOMEM;
>> +
>> + if (of_property_read_string(nc, "label", &ddata->cdev.name))
>> + ddata->cdev.name = nc->name;
>> +
>> + ddata->cdev.max_brightness = 1;
>> + ddata->cdev.brightness_set_blocking = max597x_led_set_brightness;
>> + ddata->cdev.default_trigger = "none";
>> + ddata->index = reg;
>> + ddata->regmap = regmap;
>> +
>> + ret = devm_led_classdev_register(dev, &ddata->cdev);
>> + if (ret)
>> + dev_err(dev, "Error initializing LED %s", ddata->cdev.name);
>> +
>> + return ret;
>> +}
>> +
>> +static int max597x_led_probe(struct platform_device *pdev)
>> +{
>> + struct device_node *np = dev_of_node(pdev->dev.parent);
>
> My previous question about having its own compatible string was ignored.
As previously stated, the MFD driver for max597x already has a
compatible string that serves its purpose, so I opted not to include a
separate compatible string for the leaf driver.
Prior to implementing this approach, I reviewed other implementations
within the MFD driver, such as the sy7636 which uses the similar
approach in leaf driver.
>
>> + struct regmap *regmap;
>> + struct device_node *led_node;
>> + struct device_node *child;
>> + int ret = 0;
>> +
>> + regmap = dev_get_regmap(pdev->dev.parent, NULL);
>> + if (!regmap)
>> + return -EPROBE_DEFER;
>> +
>> + led_node = of_get_child_by_name(np, "leds");
>> + if (!led_node)
>> + return -ENODEV;
>> +
>> + for_each_available_child_of_node(led_node, child) {
>> + u32 reg;
>> +
>> + if (of_property_read_u32(child, "reg", ®))
>> + continue;
>> +
>> + if (reg >= MAX597X_NUM_LEDS) {
>> + dev_err(&pdev->dev, "invalid LED (%u >= %d)\n", reg,
>> + MAX597X_NUM_LEDS);
>> + continue;
>> + }
>> +
>> + ret = max597x_setup_led(&pdev->dev, regmap, child, reg);
>> + if (ret < 0)
>> + dev_err(&pdev->dev, "Failed to initialize LED %u\n", reg);
>
> You've ignored my previous review.
I would like to clarify that I did not intend to overlook your previous
review comment. Rather, I have taken it into consideration and evaluated
it in the context of the current approach, which is derived from the
code in other LED drivers.
To eliminate any potential confusion, it may be best to adopt a
consistent approach that all LED drivers should adhere to in similar
circumstances.
>
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static struct platform_driver max597x_led_driver = {
>> + .driver = {
>> + .name = "max597x-led",
>> + },
>> + .probe = max597x_led_probe,
>> +};
>> +
>> +module_platform_driver(max597x_led_driver);
>> +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@...ements.com>");
>> +MODULE_DESCRIPTION("MAX5970_hot-swap controller LED driver");
>> +MODULE_LICENSE("GPL");
>>
>> base-commit: 9d8d0d98885abba451d7ffc4885236d14ead3c9a
>> --
>> 2.39.1
>>
>
Regards,
Naresh
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