linux-kernel - [PATCH 08/12] ARM: davinci: da850-evm: switch to using a fixed regulator for lcdc

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Date:   Tue, 25 Jun 2019 18:34:30 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        David Lechner <david@...hnology.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 08/12] ARM: davinci: da850-evm: switch to using a fixed regulator for lcdc

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Now that the da8xx fbdev driver supports power control with an actual
regulator, switch to using a fixed power supply for da850-evm.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 arch/arm/mach-davinci/board-da850-evm.c | 62 ++++++++++++++++++-------
 1 file changed, 44 insertions(+), 18 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index ffda623bb543..d26950f605f4 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -802,12 +802,6 @@ static const short da850_evm_mmcsd0_pins[] __initconst = {
 	-1
 };
 
-static void da850_panel_power_ctrl(int val)
-{
-	/* lcd power */
-	gpio_set_value(DA850_LCD_PWR_PIN, val);
-}
-
 static struct property_entry da850_lcd_backlight_props[] = {
 	PROPERTY_ENTRY_BOOL("default-on"),
 	{ }
@@ -827,28 +821,61 @@ static const struct platform_device_info da850_lcd_backlight_info = {
 	.properties	= da850_lcd_backlight_props,
 };
 
+static struct regulator_consumer_supply da850_lcd_supplies[] = {
+	REGULATOR_SUPPLY("lcd", NULL),
+};
+
+static struct regulator_init_data da850_lcd_supply_data = {
+	.consumer_supplies	= da850_lcd_supplies,
+	.num_consumer_supplies	= ARRAY_SIZE(da850_lcd_supplies),
+	.constraints    = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+	},
+};
+
+static struct fixed_voltage_config da850_lcd_supply = {
+	.supply_name		= "lcd",
+	.microvolts		= 33000000,
+	.init_data		= &da850_lcd_supply_data,
+};
+
+static struct platform_device da850_lcd_supply_device = {
+	.name			= "reg-fixed-voltage",
+	.id			= 1, /* Dummy fixed regulator is 0 */
+	.dev			= {
+		.platform_data = &da850_lcd_supply,
+	},
+};
+
+static struct gpiod_lookup_table da850_lcd_supply_gpio_table = {
+	.dev_id			= "reg-fixed-voltage.1",
+	.table = {
+		GPIO_LOOKUP("davinci_gpio", DA850_LCD_PWR_PIN, NULL, 0),
+		{ }
+	},
+};
+
+static struct gpiod_lookup_table *da850_lcd_gpio_lookups[] = {
+	&da850_lcd_backlight_gpio_table,
+	&da850_lcd_supply_gpio_table,
+};
+
 static int da850_lcd_hw_init(void)
 {
 	struct platform_device *backlight;
 	int status;
 
-	gpiod_add_lookup_table(&da850_lcd_backlight_gpio_table);
+	gpiod_add_lookup_tables(da850_lcd_gpio_lookups,
+				ARRAY_SIZE(da850_lcd_gpio_lookups));
+
 	backlight = platform_device_register_full(&da850_lcd_backlight_info);
 	if (IS_ERR(backlight))
 		return PTR_ERR(backlight);
 
-	status = gpio_request(DA850_LCD_PWR_PIN, "lcd pwr");
-	if (status < 0)
+	status = platform_device_register(&da850_lcd_supply_device);
+	if (status)
 		return status;
 
-	gpio_direction_output(DA850_LCD_PWR_PIN, 0);
-
-	/* Switch off panel power */
-	da850_panel_power_ctrl(0);
-
-	/* Switch on panel power */
-	da850_panel_power_ctrl(1);
-
 	return 0;
 }
 
@@ -1458,7 +1485,6 @@ static __init void da850_evm_init(void)
 	if (ret)
 		pr_warn("%s: LCD initialization failed: %d\n", __func__, ret);
 
-	sharp_lk043t1dg01_pdata.panel_power_ctrl = da850_panel_power_ctrl,
 	ret = da8xx_register_lcdc(&sharp_lk043t1dg01_pdata);
 	if (ret)
 		pr_warn("%s: LCDC registration failed: %d\n", __func__, ret);
-- 
2.21.0