[PATCH v4 16/16] gpio: Add a way to read 3-way strapping pins

[Tom Rini]

On Thu, Feb 04, 2021 at 09:22:09PM -0700, Simon Glass wrote:

> Using the internal vs. external pull resistors it is possible to get
> 27 different combinations from 3 strapping pins. Add an implementation
> of this.
> 
> This involves updating the sandbox GPIO driver to model external and
> (weaker) internal pull resistors. The get_value() method now takes account
> of what is driving a pin:
> 
>    sandbox: GPIOD_EXT_DRIVEN - in which case GPIO_EXT_HIGH provides the
>           value
>    outside source - in which case GPIO_EXT_PULL_UP/DOWN indicates the
>           external state and we work the final state using those flags and
>           the internal GPIOD_PULL_UP/DOWN flags
> 
> Of course the outside source does not really exist in sandbox. We are just
> modelling it for test purpose.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/next, thanks!

-- 
Tom
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