doc: board: qualcomm: document Pixel 3 / 3 XL support

U-Boot does work on Qualcomm 845-based Pixel 3 and 3 XL.

Reviewed-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Link: https://patch.msgid.link/20260108-pixel-config-v4-1-76a2212b69a5@ixit.cz
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>

doc/board/qualcomm/board.rst

@@ -38,6 +38,25 @@ with appended dtb, so let's mimic linux to satisfy stock bootloader.
 Boards
 ------
 
+Pixel 3 (blueline) and Pixel 3 XL (crosshatch)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+blueline refers to the Google Pixel 3, and crosshatch to the Pixel 3 XL, both
+powered by the Qualcomm SDM845 SoC.
+
+These devices use the common qcom_defconfig with the google-pixel.config
+fragment for configuration.
+
+Use the following commands::
+
+	make CROSS_COMPILE=aarch64-linux-gnu- O=.output qcom_defconfig google-pixel.config qcom-phone.config
+
+The DTB is called:
+
+ - "sdm845-google-blueline.dtb" (Pixel 3)
+ - "sdm845-google-crosshatch.dtb" (Pixel 3 XL)
+
+More information can be found on the `Google Pixel 3 page`_.
+
 starqlte
 ^^^^^^^^
 
@@ -131,5 +150,6 @@ Other devices with boot image version 2 can be built like this example::
 	fastboot flash boot boot.img
 	fastboot erase dtbo
 
+.. _Google Pixel 3 page: https://en.wikipedia.org/wiki/Pixel_3
 .. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
 .. _DragonBoard 845c page: https://www.96boards.org/product/rb3-platform/