[Buildroot] [PATCH v3] package/linux-tools: add gpio

[Yann E. MORIN <yann.morin.1998@free.fr>]

Marcin, All,

On 2016-10-03 14:25 +0200, Marcin Niestroj spake thusly:
> Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
> ---
> Changes v2 -> v3:
>  * Add info about supported Linux version in Config.in
>    (suggested by Baruch)
> 
> Changes v1 -> v2:
>  * Adapt to new linux-tools infra, which is moved to package/ directory
>    (suggested by Yann)
> 
>  package/linux-tools/Config.in          | 12 ++++++++++++
>  package/linux-tools/linux-tool-gpio.mk | 28 ++++++++++++++++++++++++++++
>  2 files changed, 40 insertions(+)
>  create mode 100644 package/linux-tools/linux-tool-gpio.mk
> 
> diff --git a/package/linux-tools/Config.in b/package/linux-tools/Config.in
> index 61c196f..bd07509 100644
> --- a/package/linux-tools/Config.in
> +++ b/package/linux-tools/Config.in
> @@ -20,6 +20,18 @@ comment "cpupower needs a toolchain w/ wchar"
>  	depends on !BR2_bfin
>  	depends on !BR2_USE_WCHAR && BR2_NEEDS_GETTEXT
>  
> +config BR2_PACKAGE_LINUX_TOOLS_GPIO
> +	bool "gpio"
> +	select BR2_PACKAGE_LINUX_TOOLS
> +	help
> +	  gpio is a collection of tools to get information about,
> +	  control and monitor gpios present on system.
> +
> +	  These tools use new gpio ABI which will deprecate sysfs gpio
> +	  interface in the future.
> +
> +	  These tools are available only from kernel version 4.8.
> +
>  config BR2_PACKAGE_LINUX_TOOLS_PERF
>  	bool "perf"
>  	select BR2_PACKAGE_LINUX_TOOLS
> diff --git a/package/linux-tools/linux-tool-gpio.mk b/package/linux-tools/linux-tool-gpio.mk
> new file mode 100644
> index 0000000..db0094a
> --- /dev/null
> +++ b/package/linux-tools/linux-tool-gpio.mk
> @@ -0,0 +1,28 @@
> +################################################################################
> +#
> +# gpio
> +#
> +################################################################################
> +
> +LINUX_TOOLS += gpio
> +
> +GPIO_MAKE_OPTS = CROSS_COMPILE=$(TARGET_CROSS)

Any reason not to use $(LINUX_MAKE_FLAGS) in the first place?

    GPIO_MAKE_OPTS = $(LINUX_MAKE_FLAGS)

LINUX_MAKE_FLAGS shall contain all the required variable definitions
needed to build for the target.

Yes, cpupower directly defines CROSS_COMPILE et al., but perf and
selftests do use LINUX_MAKE_FLAGS, and I think we should use that unless
there is a good reason not to.

This would allow use to easily update the compile options/variables.

(Sorry, I forgot to point that out in the previous review...)

Regards,
Yann E. MORIN.

> +define GPIO_BUILD_CMDS
> +	$(Q)if ! grep install $(LINUX_DIR)/tools/gpio/Makefile >/dev/null 2>&1 ; then \
> +		echo "Your kernel version is too old and does not have the gpio tools." ; \
> +		echo "At least kernel 4.8 must be used." ; \
> +		exit 1 ; \
> +	fi
> +
> +	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools \
> +		$(GPIO_MAKE_OPTS) \
> +		gpio
> +endef
> +
> +define GPIO_INSTALL_TARGET_CMDS
> +	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools \
> +		$(GPIO_MAKE_OPTS) \
> +		DESTDIR=$(TARGET_DIR) \
> +		gpio_install
> +endef
> -- 
> 2.10.0
> 
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