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ARM: spitz: Use software nodes for the ADS7846 touchscreen

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Convert the Spitz to use software nodes to describe GPIOs for the
ADS7846 touchscreen. As part of the conversion switch from the custom
wait_for_sync() callback to defining hsync GPIO that can be used by
the ads7846 driver to detect hsync.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240628180852.1738922-11-dmitry.torokhov@gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Linus Walleij 2024-06-28 11:08:50 -07:00 committed by Arnd Bergmann
parent 29c4e69f8e
commit 38b2482a27
No known key found for this signature in database
GPG Key ID: 60AB47FFC9095227
1 changed files with 15 additions and 25 deletions
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40
arch/arm/mach-pxa/spitz.c
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@ -534,31 +534,23 @@ static inline void spitz_leds_init(void) {}
* SSP Devices
******************************************************************************/
#if defined(CONFIG_SPI_PXA2XX) || defined(CONFIG_SPI_PXA2XX_MODULE)
static void spitz_ads7846_wait_for_hsync(void)
{
while (gpio_get_value(SPITZ_GPIO_HSYNC))
cpu_relax();
while (!gpio_get_value(SPITZ_GPIO_HSYNC))
cpu_relax();
}
static struct ads7846_platform_data spitz_ads7846_info = {
.model = 7846,
.vref_delay_usecs = 100,
.x_plate_ohms = 419,
.y_plate_ohms = 486,
.pressure_max = 1024,
.wait_for_sync = spitz_ads7846_wait_for_hsync,
static const struct property_entry spitz_ads7846_props[] = {
PROPERTY_ENTRY_STRING("compatible", "ti,ads7846"),
PROPERTY_ENTRY_U32("touchscreen-max-pressure", 1024),
PROPERTY_ENTRY_U16("ti,x-plate-ohms", 419),
PROPERTY_ENTRY_U16("ti,y-plate-ohms", 486),
PROPERTY_ENTRY_U16("ti,vref-delay-usecs", 100),
PROPERTY_ENTRY_GPIO("pendown-gpios", &pxa2xx_gpiochip_node,
SPITZ_GPIO_TP_INT, GPIO_ACTIVE_LOW),
PROPERTY_ENTRY_GPIO("ti,hsync-gpios", &pxa2xx_gpiochip_node,
SPITZ_GPIO_HSYNC, GPIO_ACTIVE_LOW),
{ }
};
static struct gpiod_lookup_table spitz_ads7846_gpio_table = {
.dev_id = "spi2.0",
.table = {
GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT,
"pendown", GPIO_ACTIVE_LOW),
{ }
},
static const struct software_node spitz_ads7846_swnode = {
.name = "ads7846",
.properties = spitz_ads7846_props,
};
static const struct property_entry spitz_lcdcon_props[] = {
@ -595,7 +587,7 @@ static struct spi_board_info spitz_spi_devices[] = {
.max_speed_hz = 1200000,
.bus_num = 2,
.chip_select = 0,
.platform_data = &spitz_ads7846_info,
.swnode = &spitz_ads7846_swnode,
.irq = PXA_GPIO_TO_IRQ(SPITZ_GPIO_TP_INT),
}, {
.modalias = "corgi-lcd",
@ -638,8 +630,6 @@ static void __init spitz_spi_init(void)
struct platform_device *pd;
int err;
gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
pd = platform_device_register_full(&spitz_spi_device_info);
err = PTR_ERR_OR_ZERO(pd);
if (err)