cmd: gpio: Add `gpio read` subcommand
As explained in commit 4af2a33ee5b9 ("cmd: gpio: Make `gpio input`
return pin value again") the `gpio input` is used in scripts to obtain
the value of a pin, despite the fact that CMD_RET_FAILURE is
indistinguishable from a valid pin value.
To be able to detect failures and properly use the value of a GPIO in
scripts we introduce the `gpio read` command that sets the variable
`name` to the value of the pin. Return code of the `gpio read` command
can be used to check for CMD_RET_SUCCESS or CMD_RET_FAILURE.
CONFIG_CMD_GPIO_READ is used to enable the `gpio read` command.
Signed-off-by: Diego Rondini <diego.rondini@kynetics.com>
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 06dbf38..14d7af4 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -60,6 +60,7 @@
CONFIG_CMD_BIND=y
CONFIG_CMD_DEMO=y
CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPIO_READ=y
CONFIG_CMD_PWM=y
CONFIG_CMD_GPT=y
CONFIG_CMD_GPT_RENAME=y