backlight: pcf50633-backlight: Remove unused driver

The pcf50633 was used as part of the OpenMoko devices but
the support for its main chip was recently removed in:
commit 61b7f892 ("ARM: s3c: remove all s3c24xx support")

See https://lore.kernel.org/all/Z8z236h4B5A6Ki3D@gallifrey/



Remove it.

Signed-off-by: "Dr. David Alan Gilbert" <linux@treblig.org>
Link: https://lore.kernel.org/r/20250311014959.743322-8-linux@treblig.org


Signed-off-by: Lee Jones <lee@kernel.org>

drivers/video/backlight/Kconfig

@@ -370,13 +370,6 @@ config BACKLIGHT_88PM860X
 	help
 	  Say Y to enable the backlight driver for Marvell 88PM8606.
 
-config BACKLIGHT_PCF50633
-	tristate "Backlight driver for NXP PCF50633 MFD"
-	depends on MFD_PCF50633
-	help
-	  If you have a backlight driven by a NXP PCF50633 MFD, say Y here to
-	  enable its driver.
-
 config BACKLIGHT_AAT2870
 	tristate "AnalogicTech AAT2870 Backlight"
 	depends on MFD_AAT2870_CORE

drivers/video/backlight/Makefile

@@ -50,7 +50,6 @@ obj-$(CONFIG_BACKLIGHT_MP3309C)		+= mp3309c.o
 obj-$(CONFIG_BACKLIGHT_MT6370)		+= mt6370-backlight.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)		+= omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
-obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_QCOM_WLED)	+= qcom-wled.o
 obj-$(CONFIG_BACKLIGHT_RT4831)		+= rt4831-backlight.o

drivers/video/backlight/pcf50633-backlight.c

-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
- *      PCF50633 backlight device driver
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/platform_device.h>
-
-#include <linux/backlight.h>
-
-#include <linux/mfd/pcf50633/core.h>
-#include <linux/mfd/pcf50633/backlight.h>
-
-struct pcf50633_bl {
-	struct pcf50633 *pcf;
-	struct backlight_device *bl;
-
-	unsigned int brightness;
-	unsigned int brightness_limit;
-};
-
-/*
- * pcf50633_bl_set_brightness_limit
- *
- * Update the brightness limit for the pc50633 backlight. The actual brightness
- * will not go above the limit. This is useful to limit power drain for example
- * on low battery.
- *
- * @dev: Pointer to a pcf50633 device
- * @limit: The brightness limit. Valid values are 0-63
- */
-int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit)
-{
-	struct pcf50633_bl *pcf_bl = platform_get_drvdata(pcf->bl_pdev);
-
-	if (!pcf_bl)
-		return -ENODEV;
-
-	pcf_bl->brightness_limit = limit & 0x3f;
-	backlight_update_status(pcf_bl->bl);
-
-	return 0;
-}
-
-static int pcf50633_bl_update_status(struct backlight_device *bl)
-{
-	struct pcf50633_bl *pcf_bl = bl_get_data(bl);
-	unsigned int new_brightness;
-
-
-	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK) ||
-		bl->props.power != BACKLIGHT_POWER_ON)
-		new_brightness = 0;
-	else if (bl->props.brightness < pcf_bl->brightness_limit)
-		new_brightness = bl->props.brightness;
-	else
-		new_brightness = pcf_bl->brightness_limit;
-
-
-	if (pcf_bl->brightness == new_brightness)
-		return 0;
-
-	if (new_brightness) {
-		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDOUT,
-					new_brightness);
-		if (!pcf_bl->brightness)
-			pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 1);
-	} else {
-		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 0);
-	}
-
-	pcf_bl->brightness = new_brightness;
-
-	return 0;
-}
-
-static int pcf50633_bl_get_brightness(struct backlight_device *bl)
-{
-	struct pcf50633_bl *pcf_bl = bl_get_data(bl);
-
-	return pcf_bl->brightness;
-}
-
-static const struct backlight_ops pcf50633_bl_ops = {
-	.get_brightness = pcf50633_bl_get_brightness,
-	.update_status	= pcf50633_bl_update_status,
-	.options	= BL_CORE_SUSPENDRESUME,
-};
-
-static int pcf50633_bl_probe(struct platform_device *pdev)
-{
-	struct pcf50633_bl *pcf_bl;
-	struct device *parent = pdev->dev.parent;
-	struct pcf50633_platform_data *pcf50633_data = dev_get_platdata(parent);
-	struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;
-	struct backlight_properties bl_props;
-
-	pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);
-	if (!pcf_bl)
-		return -ENOMEM;
-
-	memset(&bl_props, 0, sizeof(bl_props));
-	bl_props.type = BACKLIGHT_RAW;
-	bl_props.max_brightness = 0x3f;
-	bl_props.power = BACKLIGHT_POWER_ON;
-
-	if (pdata) {
-		bl_props.brightness = pdata->default_brightness;
-		pcf_bl->brightness_limit = pdata->default_brightness_limit;
-	} else {
-		bl_props.brightness = 0x3f;
-		pcf_bl->brightness_limit = 0x3f;
-	}
-
-	pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent);
-
-	pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
-						&pdev->dev, pcf_bl,
-						&pcf50633_bl_ops, &bl_props);
-
-	if (IS_ERR(pcf_bl->bl))
-		return PTR_ERR(pcf_bl->bl);
-
-	platform_set_drvdata(pdev, pcf_bl);
-
-	pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);
-
-	/*
-	 * Should be different from bl_props.brightness, so we do not exit
-	 * update_status early the first time it's called
-	 */
-	pcf_bl->brightness = pcf_bl->bl->props.brightness + 1;
-
-	backlight_update_status(pcf_bl->bl);
-
-	return 0;
-}
-
-static struct platform_driver pcf50633_bl_driver = {
-	.probe =	pcf50633_bl_probe,
-	.driver = {
-		.name = "pcf50633-backlight",
-	},
-};
-
-module_platform_driver(pcf50633_bl_driver);
-
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("PCF50633 backlight driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:pcf50633-backlight");

include/linux/mfd/pcf50633/backlight.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
- *      PCF50633 backlight device driver
- */
-
-#ifndef __LINUX_MFD_PCF50633_BACKLIGHT
-#define __LINUX_MFD_PCF50633_BACKLIGHT
-
-/*
-* @default_brightness: Backlight brightness is initialized to this value
-*
-* Brightness to be used after the driver has been probed.
-* Valid range 0-63.
-*
-* @default_brightness_limit: The actual brightness is limited by this value
-*
-* Brightness limit to be used after the driver has been probed. This is useful
-* when it is not known how much power is available for the backlight during
-* probe.
-* Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
-*
-* @ramp_time: Display ramp time when changing brightness
-*
-* When changing the backlights brightness the change is not instant, instead
-* it fades smooth from one state to another. This value specifies how long
-* the fade should take. The lower the value the higher the fade time.
-* Valid range 0-255
-*/
-struct pcf50633_bl_platform_data {
-	unsigned int	default_brightness;
-	unsigned int	default_brightness_limit;
-	uint8_t		ramp_time;
-};
-
-
-struct pcf50633;
-
-int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
-
-#endif
-

include/linux/mfd/pcf50633/core.h

@@ -15,7 +15,6 @@
 #include <linux/regulator/machine.h>
 #include <linux/pm.h>
 #include <linux/power_supply.h>
-#include <linux/mfd/pcf50633/backlight.h>
 
 struct pcf50633;
 struct regmap;
@@ -42,8 +41,6 @@ struct pcf50633_platform_data {
 	void (*force_shutdown)(struct pcf50633 *);
 
 	u8 resumers[5];
-
-	struct pcf50633_bl_platform_data *backlight_data;
 };
 
 struct pcf50633_irq {