x86/platform/geode: switch GPIO buttons and LEDs to software properties

Convert GPIO-connected buttons and LEDs in Geode boards to software
nodes/properties, so that support for platform data can be removed from
gpio-keys driver (which will rely purely on generic device properties
for configuration).

To avoid repeating the same data structures over and over and over
factor them out into a new geode-common.c file.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/ZsV6MNS_tUPPSffJ@google.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

arch/x86/Kconfig

@@ -2979,9 +2979,13 @@ config OLPC_XO15_SCI
 	   - AC adapter status updates
 	   - Battery status updates
 
+config GEODE_COMMON
+	bool
+
 config ALIX
 	bool "PCEngines ALIX System Support (LED setup)"
 	select GPIOLIB
+	select GEODE_COMMON
 	help
 	  This option enables system support for the PCEngines ALIX.
 	  At present this just sets up LEDs for GPIO control on
@@ -2996,12 +3000,14 @@ config ALIX
 config NET5501
 	bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
 	select GPIOLIB
+	select GEODE_COMMON
 	help
 	  This option enables system support for the Soekris Engineering net5501.
 
 config GEOS
 	bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
 	select GPIOLIB
+	select GEODE_COMMON
 	depends on DMI
 	help
 	  This option enables system support for the Traverse Technologies GEOS.

arch/x86/platform/geode/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_GEODE_COMMON)	+= geode-common.o
 obj-$(CONFIG_ALIX)		+= alix.o
 obj-$(CONFIG_NET5501)		+= net5501.o
 obj-$(CONFIG_GEOS)		+= geos.o

arch/x86/platform/geode/alix.c

@@ -18,15 +18,12 @@
 #include <linux/io.h>
 #include <linux/string.h>
 #include <linux/moduleparam.h>
-#include <linux/leds.h>
-#include <linux/platform_device.h>
-#include <linux/input.h>
-#include <linux/gpio_keys.h>
-#include <linux/gpio/machine.h>
 #include <linux/dmi.h>
 
 #include <asm/geode.h>
 
+#include "geode-common.h"
+
 #define BIOS_SIGNATURE_TINYBIOS		0xf0000
 #define BIOS_SIGNATURE_COREBOOT		0x500
 #define BIOS_REGION_SIZE		0x10000
@@ -41,79 +38,16 @@ module_param(force, bool, 0444);
 /* FIXME: Award bios is not automatically detected as Alix platform */
 MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
 
-static struct gpio_keys_button alix_gpio_buttons[] = {
-	{
-		.code			= KEY_RESTART,
-		.gpio			= 24,
-		.active_low		= 1,
-		.desc			= "Reset button",
-		.type			= EV_KEY,
-		.wakeup			= 0,
-		.debounce_interval	= 100,
-		.can_disable		= 0,
-	}
-};
-static struct gpio_keys_platform_data alix_buttons_data = {
-	.buttons			= alix_gpio_buttons,
-	.nbuttons			= ARRAY_SIZE(alix_gpio_buttons),
-	.poll_interval			= 20,
-};
-
-static struct platform_device alix_buttons_dev = {
-	.name				= "gpio-keys-polled",
-	.id				= 1,
-	.dev = {
-		.platform_data		= &alix_buttons_data,
-	}
-};
-
-static struct gpio_led alix_leds[] = {
-	{
-		.name = "alix:1",
-		.default_trigger = "default-on",
-	},
-	{
-		.name = "alix:2",
-		.default_trigger = "default-off",
-	},
-	{
-		.name = "alix:3",
-		.default_trigger = "default-off",
-	},
-};
-
-static struct gpio_led_platform_data alix_leds_data = {
-	.num_leds = ARRAY_SIZE(alix_leds),
-	.leds = alix_leds,
-};
-
-static struct gpiod_lookup_table alix_leds_gpio_table = {
-	.dev_id = "leds-gpio",
-	.table = {
-		/* The Geode GPIOs should be on the CS5535 companion chip */
-		GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("cs5535-gpio", 25, NULL, 1, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("cs5535-gpio", 27, NULL, 2, GPIO_ACTIVE_LOW),
-		{ }
-	},
-};
-
-static struct platform_device alix_leds_dev = {
-	.name = "leds-gpio",
-	.id = -1,
-	.dev.platform_data = &alix_leds_data,
-};
-
-static struct platform_device *alix_devs[] __initdata = {
-	&alix_buttons_dev,
-	&alix_leds_dev,
+static const struct geode_led alix_leds[] __initconst = {
+	{ 6, true },
+	{ 25, false },
+	{ 27, false },
 };
 
 static void __init register_alix(void)
 {
-	/* Setup LED control through leds-gpio driver */
-	gpiod_add_lookup_table(&alix_leds_gpio_table);
-	platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs));
+	geode_create_restart_key(24);
+	geode_create_leds("alix", alix_leds, ARRAY_SIZE(alix_leds));
 }
 
 static bool __init alix_present(unsigned long bios_phys,

arch/x86/platform/geode/geode-common.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared helpers to register GPIO-connected buttons and LEDs
+ * on AMD Geode boards.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
+#include <linux/input.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "geode-common.h"
+
+static const struct software_node geode_gpiochip_node = {
+	.name = "cs5535-gpio",
+};
+
+static const struct property_entry geode_gpio_keys_props[] = {
+	PROPERTY_ENTRY_U32("poll-interval", 20),
+	{ }
+};
+
+static const struct software_node geode_gpio_keys_node = {
+	.name = "geode-gpio-keys",
+	.properties = geode_gpio_keys_props,
+};
+
+static struct property_entry geode_restart_key_props[] = {
+	{ /* Placeholder for GPIO property */ },
+	PROPERTY_ENTRY_U32("linux,code", KEY_RESTART),
+	PROPERTY_ENTRY_STRING("label", "Reset button"),
+	PROPERTY_ENTRY_U32("debounce-interval", 100),
+	{ }
+};
+
+static const struct software_node geode_restart_key_node = {
+	.parent = &geode_gpio_keys_node,
+	.properties = geode_restart_key_props,
+};
+
+static const struct software_node *geode_gpio_keys_swnodes[] __initconst = {
+	&geode_gpiochip_node,
+	&geode_gpio_keys_node,
+	&geode_restart_key_node,
+	NULL
+};
+
+/*
+ * Creates gpio-keys-polled device for the restart key.
+ *
+ * Note that it needs to be called first, before geode_create_leds(),
+ * because it registers gpiochip software node used by both gpio-keys and
+ * leds-gpio devices.
+ */
+int __init geode_create_restart_key(unsigned int pin)
+{
+	struct platform_device_info keys_info = {
+		.name	= "gpio-keys-polled",
+		.id	= 1,
+	};
+	struct platform_device *pd;
+	int err;
+
+	geode_restart_key_props[0] = PROPERTY_ENTRY_GPIO("gpios",
+							 &geode_gpiochip_node,
+							 pin, GPIO_ACTIVE_LOW);
+
+	err = software_node_register_node_group(geode_gpio_keys_swnodes);
+	if (err) {
+		pr_err("failed to register gpio-keys software nodes: %d\n", err);
+		return err;
+	}
+
+	keys_info.fwnode = software_node_fwnode(&geode_gpio_keys_node);
+
+	pd = platform_device_register_full(&keys_info);
+	err = PTR_ERR_OR_ZERO(pd);
+	if (err) {
+		pr_err("failed to create gpio-keys device: %d\n", err);
+		software_node_unregister_node_group(geode_gpio_keys_swnodes);
+		return err;
+	}
+
+	return 0;
+}
+
+static const struct software_node geode_gpio_leds_node = {
+	.name = "geode-leds",
+};
+
+#define MAX_LEDS	3
+
+int __init geode_create_leds(const char *label, const struct geode_led *leds,
+			      unsigned int n_leds)
+{
+	const struct software_node *group[MAX_LEDS + 2] = { 0 };
+	struct software_node *swnodes;
+	struct property_entry *props;
+	struct platform_device_info led_info = {
+		.name	= "leds-gpio",
+		.id	= PLATFORM_DEVID_NONE,
+	};
+	struct platform_device *led_dev;
+	const char *node_name;
+	int err;
+	int i;
+
+	if (n_leds > MAX_LEDS) {
+		pr_err("%s: too many LEDs\n", __func__);
+		return -EINVAL;
+	}
+
+	swnodes = kcalloc(n_leds, sizeof(*swnodes), GFP_KERNEL);
+	if (!swnodes)
+		return -ENOMEM;
+
+	/*
+	 * Each LED is represented by 3 properties: "gpios",
+	 * "linux,default-trigger", and am empty terminator.
+	 */
+	props = kcalloc(n_leds * 3, sizeof(*props), GFP_KERNEL);
+	if (!props) {
+		err = -ENOMEM;
+		goto err_free_swnodes;
+	}
+
+	group[0] = &geode_gpio_leds_node;
+	for (i = 0; i < n_leds; i++) {
+		node_name = kasprintf(GFP_KERNEL, "%s:%d", label, i);
+		if (!node_name) {
+			err = -ENOMEM;
+			goto err_free_names;
+		}
+
+		props[i * 3 + 0] =
+			PROPERTY_ENTRY_GPIO("gpios", &geode_gpiochip_node,
+					    leds[i].pin, GPIO_ACTIVE_LOW);
+		props[i * 3 + 1] =
+			PROPERTY_ENTRY_STRING("linux,default-trigger",
+					      leds[i].default_on ?
+					      "default-on" : "default-off");
+		/* props[i * 3 + 2] is an empty terminator */
+
+		swnodes[i] = SOFTWARE_NODE(node_name, &props[i * 3],
+					   &geode_gpio_leds_node);
+		group[i + 1] = &swnodes[i];
+	}
+
+	err = software_node_register_node_group(group);
+	if (err) {
+		pr_err("failed to register LED software nodes: %d\n", err);
+		goto err_free_names;
+	}
+
+	led_info.fwnode = software_node_fwnode(&geode_gpio_leds_node);
+
+	led_dev = platform_device_register_full(&led_info);
+	err = PTR_ERR_OR_ZERO(led_dev);
+	if (err) {
+		pr_err("failed to create LED device: %d\n", err);
+		goto err_unregister_group;
+	}
+
+	return 0;
+
+err_unregister_group:
+	software_node_unregister_node_group(group);
+err_free_names:
+	while (--i >= 0)
+		kfree(swnodes[i].name);
+	kfree(props);
+err_free_swnodes:
+	kfree(swnodes);
+	return err;
+}

arch/x86/platform/geode/geode-common.h

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared helpers to register GPIO-connected buttons and LEDs
+ * on AMD Geode boards.
+ */
+
+#ifndef __PLATFORM_GEODE_COMMON_H
+#define __PLATFORM_GEODE_COMMON_H
+
+#include <linux/property.h>
+
+struct geode_led {
+	unsigned int pin;
+	bool default_on;
+};
+
+int geode_create_restart_key(unsigned int pin);
+int geode_create_leds(const char *label, const struct geode_led *leds,
+		      unsigned int n_leds);
+
+#endif /* __PLATFORM_GEODE_COMMON_H */

arch/x86/platform/geode/geos.c

@@ -16,88 +16,22 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/string.h>
-#include <linux/leds.h>
-#include <linux/platform_device.h>
-#include <linux/input.h>
-#include <linux/gpio_keys.h>
-#include <linux/gpio/machine.h>
 #include <linux/dmi.h>
 
 #include <asm/geode.h>
 
-static struct gpio_keys_button geos_gpio_buttons[] = {
-	{
-		.code = KEY_RESTART,
-		.gpio = 3,
-		.active_low = 1,
-		.desc = "Reset button",
-		.type = EV_KEY,
-		.wakeup = 0,
-		.debounce_interval = 100,
-		.can_disable = 0,
-	}
-};
-static struct gpio_keys_platform_data geos_buttons_data = {
-	.buttons = geos_gpio_buttons,
-	.nbuttons = ARRAY_SIZE(geos_gpio_buttons),
-	.poll_interval = 20,
-};
-
-static struct platform_device geos_buttons_dev = {
-	.name = "gpio-keys-polled",
-	.id = 1,
-	.dev = {
-		.platform_data = &geos_buttons_data,
-	}
-};
-
-static struct gpio_led geos_leds[] = {
-	{
-		.name = "geos:1",
-		.default_trigger = "default-on",
-	},
-	{
-		.name = "geos:2",
-		.default_trigger = "default-off",
-	},
-	{
-		.name = "geos:3",
-		.default_trigger = "default-off",
-	},
-};
-
-static struct gpio_led_platform_data geos_leds_data = {
-	.num_leds = ARRAY_SIZE(geos_leds),
-	.leds = geos_leds,
-};
-
-static struct gpiod_lookup_table geos_leds_gpio_table = {
-	.dev_id = "leds-gpio",
-	.table = {
-		/* The Geode GPIOs should be on the CS5535 companion chip */
-		GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("cs5535-gpio", 25, NULL, 1, GPIO_ACTIVE_LOW),
-		GPIO_LOOKUP_IDX("cs5535-gpio", 27, NULL, 2, GPIO_ACTIVE_LOW),
-		{ }
-	},
-};
-
-static struct platform_device geos_leds_dev = {
-	.name = "leds-gpio",
-	.id = -1,
-	.dev.platform_data = &geos_leds_data,
-};
+#include "geode-common.h"
 
-static struct platform_device *geos_devs[] __initdata = {
-	&geos_buttons_dev,
-	&geos_leds_dev,
+static const struct geode_led geos_leds[] __initconst = {
+	{ 6, true },
+	{ 25, false },
+	{ 27, false },
 };
 
 static void __init register_geos(void)
 {
-	/* Setup LED control through leds-gpio driver */
-	gpiod_add_lookup_table(&geos_leds_gpio_table);
-	platform_add_devices(geos_devs, ARRAY_SIZE(geos_devs));
+	geode_create_restart_key(3);
+	geode_create_leds("geos", geos_leds, ARRAY_SIZE(geos_leds));
 }
 
 static int __init geos_init(void)

arch/x86/platform/geode/net5501.c

@@ -16,80 +16,25 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/string.h>
-#include <linux/leds.h>
-#include <linux/platform_device.h>
 #include <linux/input.h>
-#include <linux/gpio_keys.h>
 #include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
 
 #include <asm/geode.h>
 
+#include "geode-common.h"
+
 #define BIOS_REGION_BASE		0xffff0000
 #define BIOS_REGION_SIZE		0x00010000
 
-static struct gpio_keys_button net5501_gpio_buttons[] = {
-	{
-		.code = KEY_RESTART,
-		.gpio = 24,
-		.active_low = 1,
-		.desc = "Reset button",
-		.type = EV_KEY,
-		.wakeup = 0,
-		.debounce_interval = 100,
-		.can_disable = 0,
-	}
-};
-static struct gpio_keys_platform_data net5501_buttons_data = {
-	.buttons = net5501_gpio_buttons,
-	.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
-	.poll_interval = 20,
-};
-
-static struct platform_device net5501_buttons_dev = {
-	.name = "gpio-keys-polled",
-	.id = 1,
-	.dev = {
-		.platform_data = &net5501_buttons_data,
-	}
-};
-
-static struct gpio_led net5501_leds[] = {
-	{
-		.name = "net5501:1",
-		.default_trigger = "default-on",
-	},
-};
-
-static struct gpio_led_platform_data net5501_leds_data = {
-	.num_leds = ARRAY_SIZE(net5501_leds),
-	.leds = net5501_leds,
-};
-
-static struct gpiod_lookup_table net5501_leds_gpio_table = {
-	.dev_id = "leds-gpio",
-	.table = {
-		/* The Geode GPIOs should be on the CS5535 companion chip */
-		GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_HIGH),
-		{ }
-	},
-};
-
-static struct platform_device net5501_leds_dev = {
-	.name = "leds-gpio",
-	.id = -1,
-	.dev.platform_data = &net5501_leds_data,
-};
-
-static struct platform_device *net5501_devs[] __initdata = {
-	&net5501_buttons_dev,
-	&net5501_leds_dev,
+static const struct geode_led net5501_leds[] __initconst = {
+	{ 6, true },
 };
 
 static void __init register_net5501(void)
 {
-	/* Setup LED control through leds-gpio driver */
-	gpiod_add_lookup_table(&net5501_leds_gpio_table);
-	platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
+	geode_create_restart_key(24);
+	geode_create_leds("net5501", net5501_leds, ARRAY_SIZE(net5501_leds));
 }
 
 struct net5501_board {