linux-kernel - Re: [PATCH v3 8/8] MIPS: DTS: jz4780: add sgx gpu node

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Date:   Sun, 24 Nov 2019 18:59:07 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Tony Lindgren <tony@...mide.com>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        OpenPVRSGX Linux Driver Group <openpvrsgx-devgroup@...ux.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, kernel@...a-handheld.com,
        linux-mips@...r.kernel.org, Paul Boddie <paul@...die.org.uk>
Subject: Re: [PATCH v3 8/8] MIPS: DTS: jz4780: add sgx gpu node

Hi Paul, Tony,

> Am 24.11.2019 um 18:48 schrieb Tony Lindgren <tony@...mide.com>:
> 
> * Paul Cercueil <paul@...pouillou.net> [191124 12:58]:
>> Le dim., nov. 24, 2019 at 12:40, H. Nikolaus Schaller <hns@...delico.com> a
>> écrit :
>>> and add interrupt and clocks.
> ...
>>> --- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
>>> +++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
>>> @@ -46,6 +46,17 @@
>>> 		#clock-cells = <1>;
>>> 	};
>>> 
>>> +	gpu: gpu@...40000 {
>> 
>> We try to keep the nodes ordered by address, could you move this node where
>> it belongs?
> ...

Yes, I have noted.

> 
>>> +		compatible = "ingenic,jz4780-sgx540-120", "img,sgx540-120",
>>> "img,sgx540", "img,sgx5";
>>> +		reg = <0x13040000 0x4000>;
>>> +
>>> +		clocks = <&cgu JZ4780_CLK_GPU>;
>>> +		clock-names = "gpu";
> 
> Just checking.. Is there something else to configure here
> potentially in addition to the clocks?

It doesn't look so. Unfortuantely there isn't much information
except a v3.18 kernel supported by the vendor and that one also
just has a gpu node with clock control.

> That is, do we need to do some interconnect specific
> configuration etc in addition to the clocks to have
> runtime PM work for enabling and disabling sgx on
> jz4780?

I think we have to leave that open for further study.

BR,
Nikolaus