Re: [PATCH v2 4/4] dt-bindings/watchdog: Add access_cs0 option for alt-boot
From: Rob Herring
Date: Thu Aug 29 2019 - 18:56:06 EST
On Mon, Aug 26, 2019 at 01:46:36PM +0300, Ivan Mikhaylov wrote:
> The option for the ast2400/2500 to get access to CS0 at runtime.
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@xxxxxxxxx>
> Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 +++++++
> 1 file changed, 7 insertions(+)
> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> index c5077a1f5cb3..023a9b578df6 100644
> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> @@ -34,6 +34,13 @@ Optional properties:
> engine is responsible for this.
> - aspeed,alt-boot: If property is present then boot from alternate block.
> + At alternate side 'access_cs0' sysfs file provides:
Don't put Linux stuff in bindings.
> + ast2400: a way to get access to the primary SPI flash
> + chip at CS0 after booting from the alternate
> + chip at CS1.
> + ast2500: a way to restore the normal address mapping from
> + (CS0->CS1, CS1->CS0) to (CS0->CS0, CS1->CS1).
> - aspeed,external-signal: If property is present then signal is sent to
> external reset counter (only WDT1 and WDT2). If not
> specified no external signal is sent.