linux-kernel - Re: [PATCH v2 1/9] arm64: dts: ti: k3-am65-main: Correct main NAVSS representation

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Date:   Thu, 23 Jan 2020 11:46:18 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Lokesh Vutla <lokeshvutla@...com>, <t-kristo@...com>, <nm@...com>
CC:     <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/9] arm64: dts: ti: k3-am65-main: Correct main NAVSS
 representation



On 23/01/2020 10.32, Lokesh Vutla wrote:
> 
> 
> On 22/01/20 5:09 PM, Peter Ujfalusi wrote:
>>
>>
>> On 22/01/2020 13.03, Lokesh Vutla wrote:
>>>
>>>
>>> On 22/01/20 1:56 PM, Peter Ujfalusi wrote:
>>>> NAVSS is a subsystem containing different IPs, it is not really a bus.
>>>> Change the compatible from "simple-bus" to "simple-mfd" to reflect that.
>>>>
>>>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>>>> ---
>>>>  arch/arm64/boot/dts/ti/k3-am65-main.dtsi | 4 ++--
>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
>>>> index efb24579922c..e40f7acbec42 100644
>>>> --- a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
>>>> +++ b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
>>>> @@ -385,8 +385,8 @@ intr_main_gpio: interrupt-controller0 {
>>>>  		ti,sci-rm-range-girq = <0x1>;
>>>>  	};
>>>>  
>>>> -	cbass_main_navss: interconnect0 {
>>>> -		compatible = "simple-bus";
>>>> +	cbass_main_navss: navss@...00000 {
>>>
>>> This introduces below dtc warning when built with W=1
>>>
>>> arch/arm64/boot/dts/ti/k3-am65-main.dtsi:388.35-530.4: Warning
>>> (unit_address_vs_reg): /interconnect@...000/navss@...00000: node has a unit
>>> name, but no reg property
>>
>> Interesting, the example in
>> Documentation/devicetree/bindings/dma/ti/k3-udma.yaml
>>
>> is basically the same and dt_binding_check is happy about it:
>> DTC     Documentation/devicetree/bindings/dma/ti/k3-udma.example.dt.yaml
>> CHECK   Documentation/devicetree/bindings/dma/ti/k3-udma.example.dt.yaml
>>
>> but it screamed when I had the simple-bus in there (copied from the
>> existing dtsi file).
>>
>> The node name for simple-bus _must_ be
>> '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'
>>
>> I would not use any of these to NAVSS node...
>>
>>> this is representing cbass inside main_navss, just like cbass_main. You can drop
>>> this patch and the similar mcu version.
>>
>> According to Documentation/devicetree/bindings/mfd/mfd.txt:
>> - compatible : "simple-mfd" - this signifies that the operating system
>>   should consider all subnodes of the MFD device as separate devices
>>   akin to how "simple-bus" indicates when to see subnodes as children
>>   for a simple memory-mapped bus.
>>
>> NAVSS is falling into simple-mfd as the devices under it are independent
>> devices.
> 
> okay, may be rename cbass_main_navss to main_navss.

Actually we don't even need label for any of the NAVSS nodes.

> 
> Thanks and regards,
> Lokesh
> 
>>
>>>
>>> Thanks and regards,
>>> Lokesh
>>>
>>>> +		compatible = "simple-mfd";
>>>>  		#address-cells = <2>;
>>>>  		#size-cells = <2>;
>>>>  		ranges;
>>>>
>>
>> - Péter
>>
>> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
>> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>>

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki