[PATCH v4 3/3] ARM: omap1: enable real software node lookup of GPIOs on Nokia 770

Bartosz Golaszewski
2026-03-30T12:41:08Z

Currently the board file for Nokia 770 creates dummy software nodes not
attached in any way to the actual GPIO controller devices and uses the
fact that GPIOLIB matching swnode's name to the GPIO chip's label during
software node lookup. This behavior is wrong and we want to remove it.
To that end, we need to first convert all existing users to creating
actual fwnode links.

Create real software nodes for GPIO controllers on OMAP16xx and
reference them from the software nodes in the nokia board file.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
arch/arm/mach-omap1/board-nokia770.c | 30 +++++-------------------------
arch/arm/mach-omap1/common.h | 3 +++
arch/arm/mach-omap1/gpio16xx.c | 28 +++++++++++++++++++++++++++-
3 files changed, 35 insertions(+), 26 deletions(-)

diff --git a/arch/arm/mach-omap1/board-nokia770.c b/arch/arm/mach-omap1/board-nokia770.c
index a5bf5554800fe17b430e84ae421ffa8da2bb11a0..46f817f6316b70ff37bb9dfde86c675fd692999b 100644
--- a/arch/arm/mach-omap1/board-nokia770.c
+++ b/arch/arm/mach-omap1/board-nokia770.c
@@ -36,25 +36,6 @@
#include "clock.h"
#include "mmc.h"

-static const struct software_node nokia770_mpuio_gpiochip_node = {
- .name = "mpuio",
-};
-
-static const struct software_node nokia770_gpiochip1_node = {
- .name = "gpio-0-15",
-};
-
-static const struct software_node nokia770_gpiochip2_node = {
- .name = "gpio-16-31",
-};
-
-static const struct software_node *nokia770_gpiochip_nodes[] = {
- &nokia770_mpuio_gpiochip_node,
- &nokia770_gpiochip1_node,
- &nokia770_gpiochip2_node,
- NULL
-};
-
#define ADS7846_PENDOWN_GPIO 15

static const unsigned int nokia770_keymap[] = {
@@ -112,7 +93,7 @@ static const struct omap_lcd_config nokia770_lcd_config __initconst = {
};

static const struct property_entry nokia770_mipid_props[] = {
- PROPERTY_ENTRY_GPIO("reset-gpios", &nokia770_gpiochip1_node,
+ PROPERTY_ENTRY_GPIO("reset-gpios", &omap16xx_gpio1_swnode,
13, GPIO_ACTIVE_LOW),
{ }
};
@@ -138,7 +119,7 @@ static const struct property_entry nokia770_ads7846_props[] = {
PROPERTY_ENTRY_U16("ti,x-plate-ohms", 180),
PROPERTY_ENTRY_U16("ti,debounce-tol", 3),
PROPERTY_ENTRY_U16("ti,debounce-rep", 1),
- PROPERTY_ENTRY_GPIO("pendown-gpios", &nokia770_gpiochip1_node,
+ PROPERTY_ENTRY_GPIO("pendown-gpios", &omap16xx_gpio1_swnode,
ADS7846_PENDOWN_GPIO, GPIO_ACTIVE_LOW),
{ }
};
@@ -225,9 +206,9 @@ static inline void nokia770_mmc_init(void)
#if IS_ENABLED(CONFIG_I2C_CBUS_GPIO)

static const struct software_node_ref_args nokia770_cbus_gpio_refs[] = {
- SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_node, 9, 0),
- SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_node, 10, 0),
- SOFTWARE_NODE_REFERENCE(&nokia770_mpuio_gpiochip_node, 11, 0),
+ SOFTWARE_NODE_REFERENCE(&omap16xx_mpu_gpio_swnode, 9, 0),
+ SOFTWARE_NODE_REFERENCE(&omap16xx_mpu_gpio_swnode, 10, 0),
+ SOFTWARE_NODE_REFERENCE(&omap16xx_mpu_gpio_swnode, 11, 0),
};

static const struct property_entry nokia770_cbus_props[] = {
@@ -318,7 +299,6 @@ static void __init omap_nokia770_init(void)
/* Unmask SleepX signal */
omap_writew((omap_readw(0xfffb5004) & ~2), 0xfffb5004);

- software_node_register_node_group(nokia770_gpiochip_nodes);
platform_add_devices(nokia770_devices, ARRAY_SIZE(nokia770_devices));

gpiod_add_lookup_table(&nokia770_irq_gpio_table);
diff --git a/arch/arm/mach-omap1/common.h b/arch/arm/mach-omap1/common.h
index 7a7c3d9eb84a06c18fbc70e7c94a161b487cd002..c0f6e231fdb4422c5d2c1aa3e33dd6dd99d2710e 100644
--- a/arch/arm/mach-omap1/common.h
+++ b/arch/arm/mach-omap1/common.h
@@ -35,6 +35,9 @@
#include "soc.h"
#include "i2c.h"

+extern const struct software_node omap16xx_mpu_gpio_swnode;
+extern const struct software_node omap16xx_gpio1_swnode;
+
#ifdef CONFIG_OMAP_SERIAL_WAKE
int omap_serial_wakeup_init(void);
#else
diff --git a/arch/arm/mach-omap1/gpio16xx.c b/arch/arm/mach-omap1/gpio16xx.c
index 55acec22fef4e73f20935473602ef6cb2f4f379c..e371183e0213912ebfa7edd34ca7e7683869ab12 100644
--- a/arch/arm/mach-omap1/gpio16xx.c
+++ b/arch/arm/mach-omap1/gpio16xx.c
@@ -9,6 +9,7 @@
*/

#include <linux/platform_data/gpio-omap.h>
+#include <linux/property.h>
#include <linux/soc/ti/omap1-io.h>

#include "hardware.h"
@@ -55,6 +56,8 @@ static struct omap_gpio_platform_data omap16xx_mpu_gpio_config = {
.regs = &omap16xx_mpuio_regs,
};

+const struct software_node omap16xx_mpu_gpio_swnode = { };
+
static struct platform_device omap16xx_mpu_gpio = {
.name = "omap_gpio",
.id = 0,
@@ -99,6 +102,8 @@ static struct omap_gpio_platform_data omap16xx_gpio1_config = {
.regs = &omap16xx_gpio_regs,
};

+const struct software_node omap16xx_gpio1_swnode = { };
+
static struct platform_device omap16xx_gpio1 = {
.name = "omap_gpio",
.id = 1,
@@ -122,6 +127,8 @@ static struct resource omap16xx_gpio2_resources[] = {
},
};

+static const struct software_node omap16xx_gpio2_swnode = { };
+
static struct omap_gpio_platform_data omap16xx_gpio2_config = {
.bank_width = 16,
.regs = &omap16xx_gpio_regs,
@@ -155,6 +162,8 @@ static struct omap_gpio_platform_data omap16xx_gpio3_config = {
.regs = &omap16xx_gpio_regs,
};

+static const struct software_node omap16xx_gpio3_swnode = { };
+
static struct platform_device omap16xx_gpio3 = {
.name = "omap_gpio",
.id = 3,
@@ -183,6 +192,8 @@ static struct omap_gpio_platform_data omap16xx_gpio4_config = {
.regs = &omap16xx_gpio_regs,
};

+static const struct software_node omap16xx_gpio4_swnode = { };
+
static struct platform_device omap16xx_gpio4 = {
.name = "omap_gpio",
.id = 4,
@@ -201,6 +212,14 @@ static struct platform_device *omap16xx_gpio_dev[] __initdata = {
&omap16xx_gpio4,
};

+static const struct software_node *omap16xx_gpio_swnodes[] __initconst = {
+ &omap16xx_mpu_gpio_swnode,
+ &omap16xx_gpio1_swnode,
+ &omap16xx_gpio2_swnode,
+ &omap16xx_gpio3_swnode,
+ &omap16xx_gpio4_swnode,
+};
+
/*
* omap16xx_gpio_init needs to be done before
* machine_init functions access gpio APIs.
@@ -208,7 +227,7 @@ static struct platform_device *omap16xx_gpio_dev[] __initdata = {
*/
static int __init omap16xx_gpio_init(void)
{
- int i;
+ int i, ret;
void __iomem *base;
struct resource *res;
struct platform_device *pdev;
@@ -244,6 +263,13 @@ static int __init omap16xx_gpio_init(void)
iounmap(base);

platform_device_register(omap16xx_gpio_dev[i]);
+
+ ret = device_add_software_node(&omap16xx_gpio_dev[i]->dev,
+ omap16xx_gpio_swnodes[i]);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add software node.\n");
+ return ret;
+ }
}

return 0;

--
2.47.3