linux-kernel - Re: [PATCH 1/2] dt-bindings: reset: Add document for Broadcom STB reset controller

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Date:   Thu, 3 Jan 2019 10:53:25 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] dt-bindings: reset: Add document for Broadcom STB
 reset controller

On 1/3/19 9:41 AM, Rob Herring wrote:
> On Thu, Dec 20, 2018 at 05:34:08PM -0800, Florian Fainelli wrote:
>> Add a binding document for the Broadcom STB reset controller, also known
>> as SW_INIT-style reset controller.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>> ---
>>  .../devicetree/bindings/reset/brcm,reset.txt  | 27 +++++++++++++++++++
>>  1 file changed, 27 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/reset/brcm,reset.txt
>>
>> diff --git a/Documentation/devicetree/bindings/reset/brcm,reset.txt b/Documentation/devicetree/bindings/reset/brcm,reset.txt
>> new file mode 100644
>> index 000000000000..6e5341b4f891
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/reset/brcm,reset.txt
>> @@ -0,0 +1,27 @@
>> +Broadcom STB SW_INIT-style reset controller
>> +===========================================
>> +
>> +Broadcom STB SoCs have a SW_INIT-style reset controller with separate
>> +SET/CLEAR/STATUS registers and possibly multiple banks, each of 32 bit
>> +reset lines.
>> +
>> +Please also refer to reset.txt in this directory for common reset
>> +controller binding usage.
>> +
>> +Required properties:
>> +- compatible: should be brcm,brcmstb-reset
>> +- reg: register base and length
>> +- #reset-cells: must be set to 1
>> +
>> +Example:
>> +
>> +	reset: reset-controller@...4318 {
>> +		compatible = "brcm,brcmstb-reset";
>> +		reg = <0x8404318 0x30>;
> 
> Based on this address, should this be a sub-node of something else? Or 
> not even a sub-node and just make the parent be a reset provider?

The reset controller is part of a larger "sundry" node which has a
collection of functionality, from pinmux/pinctrl, reset controller,
spare bits, chicken bits, anything the designers forgot to put somewhere
else and decided to put there.

If there is one thing consistent though is that given a set of 32-bit
register groups, they have a self contained functionality such that you
can break up the larger "sundry" space into smaller sub-blocks which
have one an only one functionality. Do you think this warrants a
different representation in Device Tree?
-- 
Florian