linux-kernel - Re: [PATCHv2 1/4] dt-bindings: watchdog: Add support for TI K3 RTI watchdog

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Message-ID: <90e0e943-5b84-ba61-1b6f-fe9259415df7@ti.com>
Date:   Wed, 11 Mar 2020 09:48:54 +0200
From:   Tero Kristo <t-kristo@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <linux-watchdog@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCHv2 1/4] dt-bindings: watchdog: Add support for TI K3 RTI
 watchdog

On 10/03/2020 21:37, Rob Herring wrote:
> On Mon, Mar 02, 2020 at 10:04:23PM +0200, Tero Kristo wrote:
>> TI K3 SoCs contain an RTI (Real Time Interrupt) module which can be
>> used to implement a windowed watchdog functionality. Windowed watchdog
>> will generate an error if it is petted outside the time window, either
>> too early or too late.
>>
>> Cc: Rob Herring <robh@...nel.org>
>> Cc: devicetree@...r.kernel.org
>> Signed-off-by: Tero Kristo <t-kristo@...com>
>> ---
>>   .../bindings/watchdog/ti,rti-wdt.yaml         | 52 +++++++++++++++++++
>>   1 file changed, 52 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
>> new file mode 100644
>> index 000000000000..3813f59fb6c3
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
>> @@ -0,0 +1,52 @@
>> +# SPDX-License-Identifier: GPL-2.0
> 
> Dual license new bindings please:
> 
> (GPL-2.0-only OR BSD-2-Clause)

Ok, will fix this.

> 
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/watchdog/ti,rti-wdt.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Texas Instruments K3 SoC Watchdog Timer
>> +
>> +maintainers:
>> +  - Tero Kristo <t-kristo@...com>
>> +
>> +description: |+
> 
> You can drop '|+' as there's no formatting to preserve.

Ok.

> 
>> +  The TI K3 SoC watchdog timer is implemented via the RTI (Real Time
>> +  Interrupt) IP module. This timer adds a support for windowed watchdog
>> +  mode, which will signal an error if it is pinged outside the watchdog
>> +  time window, meaning either too early or too late. The error signal
>> +  generated can be routed to either interrupt a safety controller or
>> +  to directly reset the SoC.
>> +
> 
> Reference the common watchdog.yaml schema.

I believe you mean just adding:

allOf:
   - $ref: "watchdog.yaml#"


> 
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - ti,rti-wdt
> 
> Should be SoC specific possibly with a fallback.

Ok, will change this.

> 
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +
>> +examples:
>> +  - |
>> +    /*
>> +     * RTI WDT in main domain on J721e SoC. Assigned clocks are used to
>> +     * select the source clock for the watchdog, forcing it to tick with
>> +     * a 32kHz clock in this case.
>> +     */
>> +    #include <dt-bindings/soc/ti,sci_pm_domain.h>
>> +
>> +    main_rti0: rti@...0000 {
> 
> watchdog@...

Right.

> 
>> +        compatible = "ti,rti-wdt";
>> +        reg = <0x0 0x2200000 0x0 0x100>;
>> +        clocks = <&k3_clks 252 1>;
>> +        power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>;
> 
> Not documented.

For this and assigned-clocks below...

> 
>> +        assigned-clocks = <&k3_clks 252 1>;
>> +        assigned-clock-parents = <&k3_clks 252 5>;
> 
> Not documented.

Ok will fix these, I was grepping for examples under the yaml files and 
some seem to document these standard props, some not. But, I guess 
everything listed in the examples should be documented.

Sorry all this yaml stuff is still pretty new to me. >.<

-Tero

> 
>> +    };
>> -- 
>> 2.17.1
>>
>> --

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