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Message-ID: <595fe328-b226-4db5-a424-bf07ad1890b4@redhat.com>
Date: Wed, 4 Sep 2024 15:02:17 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Mark Gross <mgross@...ux.intel.com>, Linus Walleij
<linus.walleij@...aro.org>, Borislav Petkov <bp@...en8.de>
Cc: linux-geode@...ts.infradead.org, platform-driver-x86@...r.kernel.org,
x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/platform/geode: switch GPIO buttons and LEDs to
software properties
Hi,
On 8/21/24 12:15 PM, Hans de Goede wrote:
> Hi Dmitry,
>
> On 8/21/24 7:25 AM, Dmitry Torokhov wrote:
>> 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@...il.com>
>
> Thanks, patch looks good to me:
>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
>
> Question has this been tested on at least 1 affected device ?
Since no one has stepped up to test this I was thinking I might
just as well merge it.
But I just noticed that these files are under arch/x86/platform
rather then under drivers/platform/x86 ...
So I guess this should be picked up by the x86/tip folks.
Or I can merge it through platform-drivers-x86.git/for-next
with an ack from one of the x86 maintainers.
Regards,
Hans
>> ---
>> arch/x86/Kconfig | 6 +
>> arch/x86/platform/geode/Makefile | 1 +
>> arch/x86/platform/geode/alix.c | 82 ++---------
>> arch/x86/platform/geode/geode-common.c | 180 +++++++++++++++++++++++++
>> arch/x86/platform/geode/geode-common.h | 21 +++
>> arch/x86/platform/geode/geos.c | 80 +----------
>> arch/x86/platform/geode/net5501.c | 69 +---------
>> 7 files changed, 230 insertions(+), 209 deletions(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 09f8fbcfe000..96b02e813332 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -3073,9 +3073,13 @@ 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
>> @@ -3090,12 +3094,14 @@ 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.
>> diff --git a/arch/x86/platform/geode/Makefile b/arch/x86/platform/geode/Makefile
>> index a8a6b1dedb01..34b53e97a0ad 100644
>> --- a/arch/x86/platform/geode/Makefile
>> +++ b/arch/x86/platform/geode/Makefile
>> @@ -1,4 +1,5 @@
>> # 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
>> diff --git a/arch/x86/platform/geode/alix.c b/arch/x86/platform/geode/alix.c
>> index b39bf3b5e108..be65cd704e21 100644
>> --- a/arch/x86/platform/geode/alix.c
>> +++ b/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,
>> diff --git a/arch/x86/platform/geode/geode-common.c b/arch/x86/platform/geode/geode-common.c
>> new file mode 100644
>> index 000000000000..8f365388cfbb
>> --- /dev/null
>> +++ b/arch/x86/platform/geode/geode-common.c
>> @@ -0,0 +1,180 @@
>> +// 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"
>> +
>> +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;
>> +}
>> +
>> +
>> diff --git a/arch/x86/platform/geode/geode-common.h b/arch/x86/platform/geode/geode-common.h
>> new file mode 100644
>> index 000000000000..9e0afd34bfad
>> --- /dev/null
>> +++ b/arch/x86/platform/geode/geode-common.h
>> @@ -0,0 +1,21 @@
>> +// 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 */
>> diff --git a/arch/x86/platform/geode/geos.c b/arch/x86/platform/geode/geos.c
>> index d263528c90bb..98027fb1ec32 100644
>> --- a/arch/x86/platform/geode/geos.c
>> +++ b/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)
>> diff --git a/arch/x86/platform/geode/net5501.c b/arch/x86/platform/geode/net5501.c
>> index 558384acd777..c9cee7dea99b 100644
>> --- a/arch/x86/platform/geode/net5501.c
>> +++ b/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 {
>
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