[openwrt/openwrt] ipq40xx: chromium: Support Chromium "crossystem" GPIO tooling

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/992afd2caba654bd0934ff616ed0149cd035661e

commit 992afd2caba654bd0934ff616ed0149cd035661e
Author: Brian Norris <computersforpeace at gmail.com>
AuthorDate: Fri Aug 18 18:53:58 2023 -0700

    ipq40xx: 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 Google WiFi
    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/ipq40xx/chromium/config-default       |  1 +
 .../arch/arm/boot/dts/qcom/qcom-ipq4019-wifi.dts   | 61 ++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/target/linux/ipq40xx/chromium/config-default b/target/linux/ipq40xx/chromium/config-default
index d78ca0ab28..29214b6915 100644
--- a/target/linux/ipq40xx/chromium/config-default
+++ b/target/linux/ipq40xx/chromium/config-default
@@ -1,4 +1,5 @@
 CONFIG_BLK_DEV_SD=y
+CONFIG_GPIO_CDEV_V1=y
 CONFIG_SCSI=y
 CONFIG_SCSI_COMMON=y
 CONFIG_SG_POOL=y
diff --git a/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4019-wifi.dts b/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4019-wifi.dts
index c6113e7aab..491a497af0 100644
--- a/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4019-wifi.dts
+++ b/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4019-wifi.dts
@@ -74,6 +74,67 @@
 };
 
 &tlmm {
+	gpio-line-names = "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  "",
+			  /* AP_FLASH_WP_L is crossystem ABI. */
+			  "AP_FLASH_WP_L" /* 53 */,
+			  "",
+			  "",
+			  "",
+			  /* RECOVERY_SW_L is crossystem ABI. */
+			  "RECOVERY_SW_L" /* 57 */;
+
 	fw_pinmux: fw_pinmux {
 		wp {
 			pins = "gpio53";