[PATCH] cmd: gpio: Add `gpio read` subcommand

[Tom Rini]

On Tue, Mar 22, 2022 at 06:14:35PM +0100, Diego Rondini wrote:

> 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.
> 
> Signed-off-by: Diego Rondini <diego.rondini at kynetics.com>
> ---
>  cmd/gpio.c                 | 24 ++++++++++++++++++++----
>  test/py/tests/test_gpio.py | 15 +++++++++++++++
>  2 files changed, 35 insertions(+), 4 deletions(-)

Please rework this to add CONFIG_CMD_GPIO_READ, and enable it on sandbox
as it causes a good bit of growth on a large number of platforms,
thanks.

-- 
Tom
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