Re: [PATCH v2 1/2] gpio/aspeed-sgpio: enable access to all 80 input & output sgpios

[Rob Herring <robh@xxxxxxxxxx>]

On Fri, 11 Sep 2020 09:51:04 +0800, Jeremy Kerr wrote:
> Currently, the aspeed-sgpio driver exposes up to 80 GPIO lines,
> corresponding to the 80 status bits available in hardware. Each of these
> lines can be configured as either an input or an output.
> 
> However, each of these GPIOs is actually an input *and* an output; we
> actually have 80 inputs plus 80 outputs.
> 
> This change expands the maximum number of GPIOs to 160; the lower half
> of this range are the input-only GPIOs, the upper half are the outputs.
> We fix the GPIO directions to correspond to this mapping.
> 
> This also fixes a bug when setting GPIOs - we were reading from the
> input register, making it impossible to set more than one output GPIO.
> 
> Signed-off-by: Jeremy Kerr <jk@xxxxxxxxxxxxxxxxxxxx>
> Fixes: 7db47faae79b ("gpio: aspeed: Add SGPIO driver")
> 
> ---
> v2:
>  - Fix warnings from kbuild test robot
>  - Add comment for input/output GPIO numbering
> ---
>  .../devicetree/bindings/gpio/sgpio-aspeed.txt |   5 +-
>  drivers/gpio/gpio-aspeed-sgpio.c              | 126 ++++++++++++------
>  2 files changed, 87 insertions(+), 44 deletions(-)
> 

Acked-by: Rob Herring <robh@xxxxxxxxxx>