[Buildroot] [PATCH v5 3/3] uboot: zynqmp: allow to use custom psu_init files

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Wed, 25 Jul 2018 16:35:38 +0200, Luca Ceresoli wrote:

> +config BR2_TARGET_UBOOT_ZYNQMP_PSU_INIT_FILE
> +	string "Custom psu_init_gpl file"
> +	depends on BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG
> +	help
> +	  On ZynqMP the booloader is responsible for some basic
> +	  initializations, such as enabling peripherals and
> +	  configuring pinmuxes. The psu_init_gpl.c file (and,
> +	  optionally, psu_init_gpl.h) contains the code for such
> +	  initializations.
> +
> +	  Although U-Boot contains psu_init_gpl.c files for some
> +	  boards, each of them describes only one specific
> +	  configuration. Users of a different board, or needing a
> +	  different configuration, can generate custom files using the
> +	  Xilinx development tools.
> +
> +	  Set this variable to the path to your psu_init_gpl.c file
> +	  (e.g. "board/myboard/psu_init_gpl.c"). psu_init_gpl.h, if
> +	  needed, should be in the same directory. U-Boot will build
> +	  and link the user-provided file instead of the built-in one.
> +
> +	  Leave empty to use the files provided by U-Boot.

I've also added a comment here that explains which U-Boot upstream
commit is necessary for this feature to work.

> +UBOOT_ZYNQMP_PSU_INIT = $(call qstrip,$(BR2_TARGET_UBOOT_ZYNQMP_PSU_INIT_FILE))
> +
> +ifneq ($(UBOOT_ZYNQMP_PSU_INIT),)
> +define UBOOT_ZYNQMP_KCONFIG_PSU_INIT
> +	$(call KCONFIG_SET_OPT,CONFIG_XILINX_PS_INIT_FILE,"$(shell readlink -f $(UBOOT_ZYNQMP_PSU_INIT))", \
> +           $(@D)/.config)
> +endef
> +endif

To be "consistent" with what I did for the PMU firmware, I introduced
an intermediate UBOOT_ZYNQMP_PSU_INIT_PATH variable.

Applied with those changes. Please don't hesitate to verify the
resulting commits to make sure I didn't screw up anything.

Thanks for this work on ZynqMP!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com