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authorLinus Walleij <linus.walleij@linaro.org>2024-06-28 21:08:50 +0300
committerArnd Bergmann <arnd@arndb.de>2024-07-09 16:21:16 +0300
commit38b2482a27c8da8c9c3f2079b5bf7ef719b1b7e8 (patch)
tree3b4a43a2186104198b09b4489b959fbc18fbc07b /arch
parent29c4e69f8e12b6fd26d3ac589b3706635928a44d (diff)
downloadlinux-38b2482a27c8da8c9c3f2079b5bf7ef719b1b7e8.tar.xz
ARM: spitz: Use software nodes for the ADS7846 touchscreen
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-pxa/spitz.c40
1 files 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)