[PATCH linux dev-4.10] ARM: aspeed: witherspoon: Add reset tolerance for host power GPIOs

[Andrew Geissler]

On Fri, Jul 7, 2017 at 2:25 AM, Andrew Jeffery <andrew at aj.id.au> wrote:
> Enables the host to stay up across BMC reboots. This is a temporary
> approach. Ultimately bindings support and reset tolerance capability
> will be added to the GPIO driver, and the behaviour will be described
> in the devicetree.
>
> Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
> ---
>  arch/arm/mach-aspeed/aspeed.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm/mach-aspeed/aspeed.c b/arch/arm/mach-aspeed/aspeed.c
> index 74611a9c2c79..100805e8c263 100644
> --- a/arch/arm/mach-aspeed/aspeed.c
> +++ b/arch/arm/mach-aspeed/aspeed.c
> @@ -177,7 +177,17 @@ static void __init do_zaius_setup(void)
>
>  static void __init do_witherspoon_setup(void)
>  {
> +       unsigned long reg;
> +
>         do_common_setup();
> +
> +       /* Reset tolerance for BMC_POWER_UP (GPIOD1) */
> +       reg = readl(AST_IO(AST_BASE_GPIO | 0x01C));
> +       writel(reg | BIT(25), AST_IO(AST_BASE_GPIO | 0x01C));
> +
> +       /* Reset tolerance for SOFTWARE_PGOOD (GPIOR1) */
> +       reg = readl(AST_IO(AST_BASE_GPIO | 0x12C));
> +       writel(reg | BIT(9), AST_IO(AST_BASE_GPIO | 0x12C));
>  }
>
>  static void __init do_romulus_setup(void)
> --
> 2.11.0
>

Our test team took for a spin last night on a witherspoon, looked good.

Acked-by: Andrew Geissler <geissonator at gmail.com>
Tested-by: Andrew Geissler <geissonator at gmail.com>