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sysreset: Add support for gpio-restart

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The Linux kernel has binding for gpio-restart node.
This patch is adding basic support without supporting any optional
properties.
This driver was tested on Microblaze system where gpio is connected to
SoC reset logic.
Output value is handled via gpios cells values.

In gpio_reboot_request() set_value is writing 1 because
dm_gpio_set_value() is capable to changing it when it is ACTIVE_LOW.
...
	if (desc->flags & GPIOD_ACTIVE_LOW)
		value = !value;
...

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Michal Simek
2018-07-13 11:04:56 +02:00
parent 501fc50a29
commit 0d832b3221
4 changed files with 69 additions and 0 deletions
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8
drivers/sysreset/Kconfig
View File

@@ -15,6 +15,14 @@ config SYSRESET
if SYSRESET
config SYSRESET_GPIO
bool "Enable support for GPIO reset driver"
select GPIO
help
Reset support via GPIO pin connected reset logic. This is used for
example on Microblaze where reset logic can be controlled via GPIO
pin which triggers cpu reset.
config SYSRESET_PSCI
bool "Enable support for PSCI System Reset"
depends on ARM_PSCI_FW