linux-kernel - Re: [PATCH 1/3] dt-bindings: aspeed-lpc: Add reset controller

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Date:   Mon, 19 Feb 2018 22:30:54 +1030
From:   Joel Stanley <joel@....id.au>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Jeffery <andrew@...id.au>,
        Lee Jones <lee.jones@...aro.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-aspeed@...ts.ozlabs.org
Subject: Re: [PATCH 1/3] dt-bindings: aspeed-lpc: Add reset controller

On Mon, Feb 19, 2018 at 10:16 PM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> On Mon, 2018-02-19 at 17:24 +1030, Joel Stanley wrote:
>> This describes the reset controller present in the LPC address space.
>>
>> Signed-off-by: Joel Stanley <joel@....id.au>
>> ---
>>  .../devicetree/bindings/mfd/aspeed-lpc.txt          | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>> index 514d82ced95b..721a2b1eb40f 100644
>> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>> @@ -135,3 +135,24 @@ lhc: lhc@20 {
>>       compatible = "aspeed,ast2500-lhc";
>>       reg = <0x20 0x24 0x48 0x8>;
>>  };
>> +
>> +LPC reset control
>> +-----------------
>> +
>> +The UARTs present in the ASPEED SoC can have their resets tied to the reset
>> +state of the LPC bus. Some systems may chose to modify this configuration.
>> +
>> +Required properties:
>> +
>> + - comaptible:               "aspeed,ast2500-lpc-reset" or
>
> "compatible"
>
>> +                     "aspeed,ast2400-lpc-reset"
>> + - reg:                      offset and length of the IP in the LHC memory region
>> + - #reset-controller indacates the number of reset cells excepted
>
> "indicates", "expected"

Oops, thanks.
>
>> +
>> +Example:
>> +
>> +lpc_reset: reset-controller@18 {
>> +        compatible = "aspeed,ast2500-lpc-reset";
>> +        reg = <0x18 0x4>;
>> +        #reset-cells = <1>;
>> +};
>
> Should this mention or indicate in the example that the reset-controller
> node must be child of (a subnode of) the lpc node?

This is indicated by the layout of the binding document. The "LPC
reset control" heading is below a "Host Node Children" heading.

>
> regards
> Philipp