[openwrt/openwrt] ipq806x: chromium: Support Chromium "crossystem" GPIO tooling

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/219ee4d4d73b72490ad4f2bae0427bf35501b22e

commit 219ee4d4d73b72490ad4f2bae0427bf35501b22e
Author: Brian Norris <computersforpeace at gmail.com>
AuthorDate: Fri Aug 18 18:58:48 2023 -0700

    ipq806x: chromium: Support Chromium "crossystem" GPIO tooling
    
    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 at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/16014
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/ipq806x/chromium/config-default        |  1 +
 .../arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/target/linux/ipq806x/chromium/config-default b/target/linux/ipq806x/chromium/config-default
index 927aba360f..644c6a6c69 100644
--- a/target/linux/ipq806x/chromium/config-default
+++ b/target/linux/ipq806x/chromium/config-default
@@ -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
diff --git a/target/linux/ipq806x/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts b/target/linux/ipq806x/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts
index 6adc6be4ae..9fa0ff1858 100644
--- a/target/linux/ipq806x/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts
+++ b/target/linux/ipq806x/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq8064-tplink-onhub.dts
@@ -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";