[PATCH] gpio: rgpio2p: Enhance reading of GPIO pin value

[Fabio Estevam]

[Adding the NXP folks to help reviewing it]

On Mon, Jan 24, 2022 at 5:46 PM Christoph Fritz
<chf.fritz at googlemail.com> wrote:
>
> Add support for reading GPIO pin value when function is output.
> With this patch applied, gpio toggle command is working.
>
> Signed-off-by: Christoph Fritz <chf.fritz at googlemail.com>
> ---
>  drivers/gpio/imx_rgpio2p.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/imx_rgpio2p.c b/drivers/gpio/imx_rgpio2p.c
> index 0e2874ca95c..175e460aff5 100644
> --- a/drivers/gpio/imx_rgpio2p.c
> +++ b/drivers/gpio/imx_rgpio2p.c
> @@ -39,6 +39,14 @@ static int imx_rgpio2p_is_output(struct gpio_regs *regs, int offset)
>         return val & (1 << offset) ? 1 : 0;
>  }
>
> +static int imx_rgpio2p_bank_get_direction(struct gpio_regs *regs, int offset)
> +{
> +       if ((readl(&regs->gpio_pddr) >> offset) & 0x01)
> +               return IMX_RGPIO2P_DIRECTION_OUT;
> +
> +       return IMX_RGPIO2P_DIRECTION_IN;
> +}
> +
>  static void imx_rgpio2p_bank_direction(struct gpio_regs *regs, int offset,
>                                     enum imx_rgpio2p_direction direction)
>  {
> @@ -67,7 +75,11 @@ static void imx_rgpio2p_bank_set_value(struct gpio_regs *regs, int offset,
>
>  static int imx_rgpio2p_bank_get_value(struct gpio_regs *regs, int offset)
>  {
> -       return (readl(&regs->gpio_pdir) >> offset) & 0x01;
> +       if (imx_rgpio2p_bank_get_direction(regs, offset) ==
> +           IMX_RGPIO2P_DIRECTION_IN)
> +               return (readl(&regs->gpio_pdir) >> offset) & 0x01;
> +
> +       return (readl(&regs->gpio_pdor) >> offset) & 0x01;
>  }
>
>  static int  imx_rgpio2p_direction_input(struct udevice *dev, unsigned offset)
> --
> 2.30.2
>
>
>