[PATCH 1/2] dts: add property removal option CONFIG_OF_REMOVE_PROPS

[Tom Rini]

On Wed, Jan 08, 2020 at 10:38:32PM +0100, Anatolij Gustschin wrote:

> This can be used for device tree size reduction similar as
> CONFIG_OF_SPL_REMOVE_PROPS option. For tbs2910 board this
> shrinks the image size: all -2304.0 bss -16.0 text -2288.0
> 
> Signed-off-by: Anatolij Gustschin <agust at denx.de>
> ---
>  dts/Kconfig          | 8 ++++++++
>  scripts/Makefile.lib | 3 ++-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/dts/Kconfig b/dts/Kconfig
> index 64c98dd723..49224bee93 100644
> --- a/dts/Kconfig
> +++ b/dts/Kconfig
> @@ -311,6 +311,14 @@ config OF_SPL_REMOVE_PROPS
>  	  can be discarded. This option defines the list of properties to
>  	  discard.
>  
> +config OF_REMOVE_PROPS
> +	string "List of device tree properties to drop"
> +	depends on OF_CONTROL
> +	default "interrupt-parent interrupts" if PINCTRL
> +	help
> +	  Some properties are not used by U-Boot and can be discarded.
> +	  This option defines the list of properties to discard.
> +
>  config SPL_OF_PLATDATA
>  	bool "Generate platform data for use in SPL"
>  	depends on SPL_OF_CONTROL
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 4ea898a421..3b124369ad 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -235,7 +235,8 @@ $(obj)/%.tab.h: $(src)/%.y FORCE
>  # ===========================================================================
>  
>  quiet_cmd_shipped = SHIPPED $@
> -cmd_shipped = cat $< > $@
> +cmd_shipped = cat $< | $(objtree)/tools/fdtgrep -r -O dtb - -o $@	\
> +		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_REMOVE_PROPS)))
>  
>  $(obj)/%: $(src)/%_shipped
>  	$(call cmd,shipped)

On further thinking, this will make it harder in the case of passing the
DTB directly to the kernel.  We should guard this option by something
else first.

-- 
Tom
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