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regulator: rpi-panel: Add GPIO control for panel and touch resets
We need independent control of the resets for the panel&bridge, vs the touch controller. Expose the reset lines that are on the Atmel's port C via the GPIO API so that they can be controlled appropriately. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com> Link: https://lore.kernel.org/r/20220124220129.158891-7-detlev.casanova@collabora.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -984,6 +984,7 @@ config REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY
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tristate "Raspberry Pi 7-inch touchscreen panel ATTINY regulator"
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depends on BACKLIGHT_CLASS_DEVICE
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depends on I2C
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depends on OF_GPIO
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select REGMAP_I2C
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help
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This driver supports ATTINY regulator on the Raspberry Pi 7-inch
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@ -8,6 +8,7 @@
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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@ -44,10 +45,30 @@
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#define PC_RST_LCD_N BIT(2)
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#define PC_RST_BRIDGE_N BIT(3)
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enum gpio_signals {
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RST_BRIDGE_N, /* TC358762 bridge reset */
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RST_TP_N, /* Touch controller reset */
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NUM_GPIO
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};
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struct gpio_signal_mappings {
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unsigned int reg;
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unsigned int mask;
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};
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static const struct gpio_signal_mappings mappings[NUM_GPIO] = {
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[RST_BRIDGE_N] = { REG_PORTC, PC_RST_BRIDGE_N | PC_RST_LCD_N },
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[RST_TP_N] = { REG_PORTC, PC_RST_TP_N },
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};
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struct attiny_lcd {
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/* lock to serialise overall accesses to the Atmel */
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struct mutex lock;
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struct regmap *regmap;
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bool gpio_states[NUM_GPIO];
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u8 port_states[3];
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struct gpio_chip gc;
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};
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static const struct regmap_config attiny_regmap_config = {
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@ -58,6 +79,17 @@ static const struct regmap_config attiny_regmap_config = {
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.cache_type = REGCACHE_NONE,
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};
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static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val)
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{
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state->port_states[reg - REG_PORTA] = val;
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return regmap_write(state->regmap, reg, val);
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};
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static u8 attiny_get_port_state(struct attiny_lcd *state, int reg)
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{
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return state->port_states[reg - REG_PORTA];
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};
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static int attiny_lcd_power_enable(struct regulator_dev *rdev)
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{
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struct attiny_lcd *state = rdev_get_drvdata(rdev);
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@ -65,7 +97,7 @@ static int attiny_lcd_power_enable(struct regulator_dev *rdev)
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mutex_lock(&state->lock);
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/* Ensure bridge, and tp stay in reset */
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regmap_write(rdev->regmap, REG_PORTC, 0);
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attiny_set_port_state(state, REG_PORTC, 0);
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usleep_range(5000, 10000);
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/* Default to the same orientation as the closed source
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@ -73,26 +105,16 @@ static int attiny_lcd_power_enable(struct regulator_dev *rdev)
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* configuration will be supported using VC4's plane
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* orientation bits.
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*/
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regmap_write(rdev->regmap, REG_PORTA, PA_LCD_LR);
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attiny_set_port_state(state, REG_PORTA, PA_LCD_LR);
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usleep_range(5000, 10000);
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regmap_write(rdev->regmap, REG_PORTB, PB_LCD_MAIN);
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/* Main regulator on, and power to the panel (LCD_VCC_N) */
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attiny_set_port_state(state, REG_PORTB, PB_LCD_MAIN);
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usleep_range(5000, 10000);
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/* Bring controllers out of reset */
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regmap_write(rdev->regmap, REG_PORTC,
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PC_LED_EN | PC_RST_BRIDGE_N | PC_RST_LCD_N | PC_RST_TP_N);
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attiny_set_port_state(state, REG_PORTC, PC_LED_EN);
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msleep(80);
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regmap_write(rdev->regmap, REG_ADDR_H, 0x04);
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usleep_range(5000, 8000);
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regmap_write(rdev->regmap, REG_ADDR_L, 0x7c);
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usleep_range(5000, 8000);
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regmap_write(rdev->regmap, REG_WRITE_DATA_H, 0x00);
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usleep_range(5000, 8000);
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regmap_write(rdev->regmap, REG_WRITE_DATA_L, 0x00);
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msleep(100);
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mutex_unlock(&state->lock);
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return 0;
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@ -106,11 +128,12 @@ static int attiny_lcd_power_disable(struct regulator_dev *rdev)
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regmap_write(rdev->regmap, REG_PWM, 0);
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usleep_range(5000, 10000);
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regmap_write(rdev->regmap, REG_PORTA, 0);
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attiny_set_port_state(state, REG_PORTA, 0);
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usleep_range(5000, 10000);
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regmap_write(rdev->regmap, REG_PORTB, PB_LCD_VCC_N);
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attiny_set_port_state(state, REG_PORTB, PB_LCD_VCC_N);
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usleep_range(5000, 10000);
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regmap_write(rdev->regmap, REG_PORTC, 0);
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attiny_set_port_state(state, REG_PORTC, 0);
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msleep(30);
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mutex_unlock(&state->lock);
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@ -211,6 +234,45 @@ static const struct backlight_ops attiny_bl = {
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.get_brightness = attiny_get_brightness,
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};
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static int attiny_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
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{
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return GPIO_LINE_DIRECTION_OUT;
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}
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static void attiny_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
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{
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struct attiny_lcd *state = gpiochip_get_data(gc);
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u8 last_val;
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if (off >= NUM_GPIO)
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return;
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mutex_lock(&state->lock);
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last_val = attiny_get_port_state(state, mappings[off].reg);
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if (val)
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last_val |= mappings[off].mask;
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else
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last_val &= ~mappings[off].mask;
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attiny_set_port_state(state, mappings[off].reg, last_val);
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if (off == RST_BRIDGE_N && val) {
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usleep_range(5000, 8000);
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regmap_write(state->regmap, REG_ADDR_H, 0x04);
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usleep_range(5000, 8000);
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regmap_write(state->regmap, REG_ADDR_L, 0x7c);
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usleep_range(5000, 8000);
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regmap_write(state->regmap, REG_WRITE_DATA_H, 0x00);
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usleep_range(5000, 8000);
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regmap_write(state->regmap, REG_WRITE_DATA_L, 0x00);
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msleep(100);
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}
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mutex_unlock(&state->lock);
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}
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/*
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* I2C driver interface functions
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*/
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@ -289,6 +351,23 @@ static int attiny_i2c_probe(struct i2c_client *i2c,
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bl->props.brightness = 0xff;
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state->gc.parent = &i2c->dev;
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state->gc.label = i2c->name;
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state->gc.owner = THIS_MODULE;
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state->gc.of_node = i2c->dev.of_node;
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state->gc.base = -1;
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state->gc.ngpio = NUM_GPIO;
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state->gc.set = attiny_gpio_set;
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state->gc.get_direction = attiny_gpio_get_direction;
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state->gc.can_sleep = true;
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ret = devm_gpiochip_add_data(&i2c->dev, &state->gc, state);
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if (ret) {
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dev_err(&i2c->dev, "Failed to create gpiochip: %d\n", ret);
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goto error;
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}
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return 0;
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error:
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