[PATCH 10/10] ARM: spitz: Use software nodes for the ADS7846 touchscreen

Dmitry Torokhov
2024-06-28T18:09:13Z

From: Linus Walleij <linus.walleij@linaro.org>

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>
---
arch/arm/mach-pxa/spitz.c | 40 +++++++++++++++------------------------
1 file changed, 15 insertions(+), 25 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index b19d4ed35192..452bf7aac1fa 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -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)
--
2.45.2.803.g4e1b14247a-goog