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ipq806x: chromium: Support Chromium "crossystem" GPIO tooling

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ChromiumOS's vboot_reference tooling [1] provides convenient access to
various firmware and hardware details via its `crossystem` tool.
crossystem currently:
(1) relies on the v1 GPIO cdev API to read GPIOs; and
(2) expects gpio-line-names properties.

Enable the kernel config, and document a few pins for OnHub devices.

I only go so far as to pull two relevant names out of the vendor device
tree. Others could perhaps be backfilled if the info is available and
useful.

[1] https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/HEAD/README

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Brian Norris 2023-08-18 18:58:48 -07:00
parent ed58808e34
commit 7c61e17449
2 changed files with 22 additions and 0 deletions
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1
target/linux/ipq806x/chromium/config-default
View File

@ -1,5 +1,6 @@
# CONFIG_ARM_QCOM_SPM_CPUIDLE is not set
CONFIG_BLK_DEV_SD=y
CONFIG_GPIO_CDEV_V1=y
CONFIG_LEDS_LP5523=y
CONFIG_LEDS_LP55XX_COMMON=y
CONFIG_PHY_QCOM_IPQ806X_USB=y

21
target/linux/ipq806x/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts
View File

@ -14,6 +14,27 @@
};
&qcom_pinmux {
gpio-line-names = "",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
/* RECOVERY_SW_L is crossystem ABI. */
"RECOVERY_SW_L", /* 16 */
/* AP_FLASH_WP_L is crossystem ABI. */
"AP_FLASH_WP_L" /* 17 */;
i2c7_pins: i2c7_pinmux {
mux {
pins = "gpio8", "gpio9";