Changes in Kconfig

883f968dcbb08a155101e3a943557530d4ac0463 - platform/chrome: Prevent build for big-endian systems

Sun, 31 May 2026 15:20:16 +0200

platform/chrome: Prevent build for big-endian systemsBoth ARM and ARM64 which are a dependency for CHROME_PLATFORMS haveseldomly used big-endian variants.The ChromeOS EC framework and drivers are written under the assumptionthat they will be running on a little-endian systems. Code which wouldbe broken on big-endian can be found trivially.Some examples:cros_ec.c: suspend_params.sleep_timeout_ms = ec_dev->suspend_timeout_mscros_ec_debugfs.c: resp->time_since_ec_boot_mscros_ec_wdt.c: arg.req.reboot_timeout_sec = wdd->timeoutPrevent the build for big-endian systems.Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20260531-cros-big-endian-v1-2-0cc90f39c636@weissschuh.netSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

6b81cbaf36f4a4735c1bf2bb609c8e53e2d5706a - platform/chrome: Remove superfluous dependencies from CROS_EC

Sun, 31 May 2026 15:20:15 +0200

platform/chrome: Remove superfluous dependencies from CROS_ECCROS_EC depends on CHROME_PLATFORMS which already declares thesedependencies.Remove the duplication.Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20260531-cros-big-endian-v1-1-0cc90f39c636@weissschuh.netSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

cc2d5b72b13b3af2b9b4bed3d5dfd0de14414230 - platform/chrome: Fix typo in CROS_USBPD_NOTIFY help text

Wed, 23 Jul 2025 16:09:30 +0200

platform/chrome: Fix typo in CROS_USBPD_NOTIFY help textCorrect the misspelling "platorms" to "platforms" in the help textfor the CROS_USBPD_NOTIFY Kconfig option.Signed-off-by: Keenan Salandy Link: https://lore.kernel.org/r/20250723140930.1443-1-keenansalandy@gmail.comSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

31d3bd592df5bf2912b8d97b0652ac3f0cd335cf - platform/chrome: cros_kbd_led_backlight: Fix build dependencies

Mon, 14 Apr 2025 15:24:27 +0200

platform/chrome: cros_kbd_led_backlight: Fix build dependenciesccf395bde6ae ("platform/chrome: cros_ec_proto: Allow to build as module")allows CROS_EC_PROTO to be a module.The config is possible to be:- CONFIG_ACPI=y- CONFIG_CROS_EC=m- CONFIG_MFD_CROS_EC_DEV=m- CONFIG_CROS_EC_PROTO=m- CONFIG_CROS_KBD_LED_BACKLIGHT=yAs a result:ld: vmlinux.o: in function `keyboard_led_set_brightness_ec_pwm':cros_kbd_led_backlight.c:(.text+0x3554e4c): undefined reference to `cros_ec_cmd_xfer_status'ld: vmlinux.o: in function `keyboard_led_get_brightness_ec_pwm':cros_kbd_led_backlight.c:(.text+0x3554f41): undefined reference to `cros_ec_cmd_xfer_status'The built-in code in CROS_KBD_LED_BACKLIGHT can't find symbols defined inthe module CROS_EC_PROTO.Let A=ACPI (bool), M=MFD_CROS_EC_DEV (tristate), andK=CROS_KBD_LED_BACKLIGHT (tristate). The possible values are:| A | M | choice for K |------------------------| y | y | y/m/n || y | m | m/n || y | n | y/m/n || n | y | y/m/n || n | m | m/n || n | n | n |Fix the dependencies in the Kconfig.Reported-by: Randy Dunlap Closes: https://lore.kernel.org/chrome-platform/ed8adc69-c505-4108-bf63-92911b0395c7@infradead.org/T/#uFixes: ccf395bde6ae ("platform/chrome: cros_ec_proto: Allow to build as module")Tested-by: Randy Dunlap Link: https://lore.kernel.org/r/20250414132427.204078-3-tzungbi@kernel.orgSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

9aea0edcc3e92f5c40184b96d004b4af5a8d264f - platform/chrome: cros_kbd_led_backlight: Remove CROS_EC dependency

Mon, 14 Apr 2025 15:24:26 +0200

platform/chrome: cros_kbd_led_backlight: Remove CROS_EC dependencyAfter applying 3a1d61dc3202 ("platform/chrome: cros_kbd_led_backlight:Remove OF match"), cros_kbd_led_backlight no longer depends on CROS_ECdirectly.Remove the redundant dependency.Fixes: 3a1d61dc3202 ("platform/chrome: cros_kbd_led_backlight: Remove OF match")Tested-by: Randy Dunlap Link: https://lore.kernel.org/r/20250414132427.204078-2-tzungbi@kernel.orgSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

ccf395bde6aeefac139f4f250287feb139e3355d - platform/chrome: cros_ec_proto: Allow to build as module

Fri, 28 Mar 2025 14:26:12 +0100

platform/chrome: cros_ec_proto: Allow to build as moduleAllow to build ChromeOS EC communication protocol helpers askernel module which is particularly useful for Android GKI (GenericKernel Image) configuration. With this change the ChromeOS Platform(CONFIG_CHROME_PLATFORMS=y) can be enabled directly from the vendorkconfig fragment whithout additional configuration in gki_defconfig.Signed-off-by: Slawomir Rosek Link: https://lore.kernel.org/r/20250328132612.511471-1-srosek@chromium.orgSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

3b00be26b16ad72c85624ada08cbae2d2c57b6e9 - platform/chrome: cros_ec_typec: Thunderbolt support

Sat, 14 Dec 2024 00:35:48 +0100

platform/chrome: cros_ec_typec: Thunderbolt supportAdd support for entering and exiting Thunderbolt alt-mode using APdriven alt-mode.Signed-off-by: Abhishek Pandit-Subedi Reviewed-by: Benson Leung Link: https://lore.kernel.org/r/20241213153543.v5.7.Ic61ced3cdfb5d6776435356061f12307da719829@changeidSigned-off-by: Greg Kroah-Hartman List of files: /linux/drivers/platform/chrome/Kconfig

dbb3fc0ffa95788e00e50ffc6501eb0085d48231 - platform/chrome: cros_ec_typec: Displayport support

Sat, 14 Dec 2024 00:35:47 +0100

platform/chrome: cros_ec_typec: Displayport supportAdd support for entering and exiting displayport alt-mode on systemsusing AP driven alt-mode.Signed-off-by: Abhishek Pandit-Subedi Link: https://lore.kernel.org/r/20241213153543.v5.6.I142fc0c09df58689b98f0cebf1c5e48b9d4fa800@changeidSigned-off-by: Greg Kroah-Hartman List of files: /linux/drivers/platform/chrome/Kconfig

3fc361af8ab0a96619ba0146a5f694f59ae3f4c2 - platform/chrome: Introduce device tree hardware prober

Wed, 06 Nov 2024 10:33:33 +0100

platform/chrome: Introduce device tree hardware proberSome devices are designed and manufactured with some components havingmultiple drop-in replacement options. These components are oftenconnected to the mainboard via ribbon cables, having the same signalsand pin assignments across all options. These may include the displaypanel and touchscreen on laptops and tablets, and the trackpad onlaptops. Sometimes which component option is used in a particular devicecan be detected by some firmware provided identifier, other times thatinformation is not available, and the kernel has to try to probe eachdevice.This change attempts to make the "probe each device" case cleaner. Thecurrent approach is to have all options added and enabled in the devicetree. The kernel would then bind each device and run each driver's probefunction. This works, but has been broken before due to the introductionof asynchronous probing, causing multiple instances requesting "shared"resources, such as pinmuxes, GPIO pins, interrupt lines, at the sametime, with only one instance succeeding. Work arounds for these includemoving the pinmux to the parent I2C controller, using GPIO hogs orpinmux settings to keep the GPIO pins in some fixed configuration, andrequesting the interrupt line very late. Such configurations can be seenon the MT8183 Krane Chromebook tablets, and the Qualcomm sc8280xp-basedLenovo Thinkpad 13S.Instead of this delicate dance between drivers and device tree quirks,this change introduces a simple I2C component prober. For any givenclass of devices on the same I2C bus, it will go through all of them,doing a simple I2C read transfer and see which one of them responds.It will then enable the device that responds.This requires some minor modifications in the existing device tree.The status for all the device nodes for the component options must beset to "fail-needs-probe". This makes it clear that some mechanism isneeded to enable one of them, and also prevents the prober and devicedrivers running at the same time.Signed-off-by: Chen-Yu Tsai Acked-by: Tzung-Bi Shih Reviewed-by: Douglas Anderson Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Wolfram Sang List of files: /linux/drivers/platform/chrome/Kconfig

baa19b650794d58d01ec3ea03c63eb4ae0fa9d84 - platform/chrome: cros_kbd_led_backlight: allow binding through MFD

Sun, 26 May 2024 20:17:17 +0200

platform/chrome: cros_kbd_led_backlight: allow binding through MFDThe ChromeOS EC used in Framework laptops supports the standard CrOS ECkeyboard backlight protocol.However the firmware on these laptops doesn't implement the ACPI IDGOOG0002 that is recognized by cros_kbd_led_backlight and they alsodon't use device tree.Prepare the existing cros_kbd_led_backlight driver to be probed throughthe CrOS EC MFD device which works without ACPI or OF support.Signed-off-by: Thomas Weißschuh Acked-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20240526-cros_ec-kbd-led-framework-v3-3-ee577415a521@weissschuh.netSigned-off-by: Lee Jones List of files: /linux/drivers/platform/chrome/Kconfig

d33d22551d80ed0afbb8d23befa2384c4d963685 - platform/chrome: add HAS_IOPORT dependencies

Fri, 05 Apr 2024 15:41:51 +0200

platform/chrome: add HAS_IOPORT dependenciesIn a future patch HAS_IOPORT=n will disable inb()/outb() and friends atcompile time. We thus need to add HAS_IOPORT as dependency for thosedrivers using them.Co-developed-by: Arnd Bergmann Signed-off-by: Arnd Bergmann Signed-off-by: Niklas Schnelle Link: https://lore.kernel.org/r/20240405134151.5560-2-schnelle@linux.ibm.comSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

466f70fb1b10fd139582646285e587fb38a9ff2c - platform/chrome: kunit: make EC protocol tests independent

Tue, 03 Oct 2023 10:05:15 +0200

platform/chrome: kunit: make EC protocol tests independentRemove CONFIG_CROS_KUNIT and common code concept for ChromeOS Kunit butmake it bundle to ChromeOS EC protocol tests.Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20231003080515.4011374-1-tzungbi@kernel.orgSigned-off-by: Tzung-Bi Shih List of files: /linux/drivers/platform/chrome/Kconfig

e5eea6a3319fcd0d6c71c8ff359e0d8c5b1bd5cd - platform/chrome: cros_ec_typec: Alter module name with hyphens

Wed, 28 Dec 2022 01:45:10 +0100

platform/chrome: cros_ec_typec: Alter module name with hyphensChange the Type-C module name from cros_ec_typec to cros-ec-typec. Thisallows us to include more files in the same module (rather than relyingon the file name cros_ec_typec to also be the module name).Signed-off-by: Prashant Malani [pmalani: Fixed trivial conflict in Makefile]Reviewed-by: Benson Leung Acked-by: Heikki Krogerus Link: https://lore.kernel.org/r/20221228004648.793339-8-pmalani@chromium.org List of files: /linux/drivers/platform/chrome/Kconfig

04a8bdd135cc05b10b665cedb360c7353312602d - platform/chrome: cros_ec_uart: Add transport layer

Tue, 27 Dec 2022 20:32:22 +0100

platform/chrome: cros_ec_uart: Add transport layerThis patch does following:1. Adds a new cros-ec-uart driver. This driver can send EC requests on UART and process response packets received on UART transport.2. Once probed, this driver will initialize the serdev device based on the underlying information in the ACPI resource. After serdev device properties are set, this driver will register itself cros-ec.3. High level driver can use this implementation to talk to ChromeOS Embedded Controller device in case it supports UART as transport.4. When cros-ec driver initiates a request packet, outgoing message is processed in buffer and sent via serdev. Once bytes are sent, driver enables a wait_queue.5. Since ChromeOS EC device sends response asynchronously, AP's TTY driver accumulates response bytes and calls the registered callback. TTY driver can send multiple callback for bytes ranging from 1 to MAX bytes supported by EC device.6. Driver waits for EC_MSG_DEADLINE_MS to collect and process received bytes. It wakes wait_queue if expected bytes are received or else wait_queue timeout. Based on the error condition, driver returns data_len or error to cros_ec.Signed-off-by: Bhanu Prakash Maiya Co-developed-by: Mark Hasemeyer Signed-off-by: Mark Hasemeyer Reviewed-by: Prashant Malani Signed-off-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20221227123212.v13.1.If7926fcbad397bc6990dd725690229bed403948c@changeid List of files: /linux/drivers/platform/chrome/Kconfig

5f9952548d91263eaf70a2ca71f8897c2a638cf1 - platform/chrome: add a driver for HPS

Tue, 18 Oct 2022 06:06:23 +0200

platform/chrome: add a driver for HPSThis patch introduces a driver for the ChromeOS human presencesensor (aka. HPS). The driver supports a sensor connected to the I2C busand identified as "GOOG0020" in the ACPI tables.When loaded, the driver exports the sensor to userspace through acharacter device. This device only supports power management, i.e.,communication with the sensor must be done through regular I2Ctransmissions from userspace.Power management is implemented by enabling the respective power GPIOwhile at least one userspace process holds an open fd on the characterdevice. By default, the device is powered down if there are no activeclients.Note that the driver makes no effort to preserve the state of the sensorbetween power down and power up events. Userspace is responsible forreinitializing any needed state once power has been restored.The device firmware, I2C protocol and other documentation is availableat https://chromium.googlesource.com/chromiumos/platform/hps-firmware.Co-developed-by: Sami Kyöstilä Signed-off-by: Sami Kyöstilä Signed-off-by: Dan Callaghan Signed-off-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20221018040623.2173441-1-dcallagh@chromium.org List of files: /linux/drivers/platform/chrome/Kconfig

affc804c44c8259ae53423aa3b5c20907e3a9a34 - platform/chrome: cros_typec_switch: Add switch driver

Tue, 16 Aug 2022 23:48:30 +0200

platform/chrome: cros_typec_switch: Add switch driverIntroduce a driver to configure USB Type-C mode switches and retimerswhich are controlled by the ChromeOS EC (Embedded Controller).This allows Type-C port drivers, as well as alternate mode drivers toconfigure their relevant mode switches and retimers according to theType-C state they want to achieve.ACPI devices with ID GOOG001A will bind to this driver.Currently, we only register a retimer switch with a stub set function.Subsequent patches will implement the host command set functionality,and introduce mode switches.Signed-off-by: Prashant Malani Reviewed-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20220816214857.2088914-3-pmalani@chromium.org List of files: /linux/drivers/platform/chrome/Kconfig

f92dd1475b0644b4779eed6f937a1eebfb80d53d - platform/chrome: merge Kunit utils and test cases

Wed, 20 Jul 2022 06:47:53 +0200

platform/chrome: merge Kunit utils and test casesMerge CROS_KUNIT and CROS_EC_PROTO_KUNIT_TEST so that when they're builtas modules cros_kunit_util doesn't need to export the symbols.Signed-off-by: Tzung-Bi Shih Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20220720044754.4026295-2-tzungbi@kernel.org List of files: /linux/drivers/platform/chrome/Kconfig

b99eb596efbd2aa138dad3dd5b6705b2e8c42c36 - platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_query_all()

Thu, 09 Jun 2022 10:49:38 +0200

platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_query_all()cros_ec_query_all() sends multiple host commands to EC for queryingsupported protocols and settings.Add required mock for interacting with cros_ec_query_all() and Kunittests.Reviewed-by: Guenter Roeck Signed-off-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20220609084957.3684698-3-tzungbi@kernel.org List of files: /linux/drivers/platform/chrome/Kconfig

40f58143745eaabc68ef44b068642ca3b38d23a6 - platform/chrome: cros_kbd_led_backlight: support EC PWM backend

Mon, 23 May 2022 11:08:22 +0200

platform/chrome: cros_kbd_led_backlight: support EC PWM backendEC PWM backend uses EC_CMD_PWM_SET_KEYBOARD_BACKLIGHT andEC_CMD_PWM_GET_KEYBOARD_BACKLIGHT for setting and getting the brightnessrespectively.Signed-off-by: Tzung-Bi Shih Reviewed-by: Matthias Kaehlcke Tested-by: Matthias Kaehlcke Link: https://lore.kernel.org/r/20220523090822.3035189-6-tzungbi@kernel.org List of files: /linux/drivers/platform/chrome/Kconfig

db681eaf7145158fb49eddbdb548692e8bfe7fab - platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_prepare_tx()

Wed, 18 May 2022 11:18:11 +0200

platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_prepare_tx()cros_ec_prepare_tx() is used to fill the protocol headers according tothe requested protocol version.Add Kunit tests cros_ec_prepare_tx() for each version.Signed-off-by: Tzung-Bi Shih Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20220518091814.2028579-2-tzungbi@kernel.org List of files: /linux/drivers/platform/chrome/Kconfig