On Fri, Jun 1, 2018 at 3:51 AM, Srinath Mannam
<srinath.mannam@xxxxxxxxxxxx> wrote:
> Hi Rob Herring,
>
> Thank you for the review.
> Please find my answers inline..
>
> On Thu, May 31, 2018 at 10:18 PM, Rob Herring <robh@xxxxxxxxxx> wrote:
>> On Mon, May 28, 2018 at 11:11:22AM +0530, Srinath Mannam wrote:
>>> From: Pramod Kumar <pramod.kumar@xxxxxxxxxxxx>
>>>
>>> Add binding document for supported thermal implementation
>>> in Stingray.
>>>
>>> Signed-off-by: Pramod Kumar <pramod.kumar@xxxxxxxxxxxx>
>>> Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
>>> Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
>>> Reviewed-by: Srinath Mannam <srinath.mannam@xxxxxxxxxxxx>
>>> ---
>>> .../bindings/thermal/brcm,sr-thermal.txt | 45 ++++++++++++++++++++++
>>> 1 file changed, 45 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/thermal/brcm,sr-thermal.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/thermal/brcm,sr-thermal.txt b/Documentation/devicetree/bindings/thermal/brcm,sr-thermal.txt
>>> new file mode 100644
>>> index 0000000..33f9e11
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/thermal/brcm,sr-thermal.txt
>>> @@ -0,0 +1,45 @@
>>> +* Broadcom Stingray Thermal
>>> +
>>> +This binding describes thermal sensors that is part of Stingray SoCs.
>>> +
>>> +Required properties:
>>> +- compatible : Must be "brcm,sr-thermal"
>>> +- reg : memory where tmon data will be available.
>>
>> What type of memory is this?
> This is shared memory(cache-able) which is shared between two micro controllers.
What else is in this shared memory? You should probably be
representing that as a whole somewhere in DT.
> One micro controller update temperature of all thermal zones in this
> shared memory.
> thermal driver running on another micro controller monitors
> temperature data of all thermal zones.
>>
>>> +
>>> +Example:
>>> + tmons {
>>> + compatible = "simple-bus";
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> + ranges;
>>> +
>>> + tmon_ihost0: thermal@8f100000 {
>>> + compatible = "brcm,sr-thermal";
>>> + reg = <0x8f100000 0x4>;
>>> + };
>>
>> Convince me that you need a node per register. This can all be
>> accomplished with a single node and either a single reg entry or a
>> series of reg entries.
>>
> In our system we have 6 different thermal zones. each node belongs to
> one thermal zone.
> thermal driver detects each node as separate thermal zone and monitors
> separately.
> register entry is only 4byte memory which contains the temperature
> value of respective thermal zone.
> Based on requirement we can increase or decrease the number thermal
> zones need to monitor.
Still, all this can be accomplished with a single node. Having a node
per register in DT doesn't scale.
Rob
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
