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

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Date:   Mon, 25 Nov 2019 07:46:21 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        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

* H. Nikolaus Schaller <hns@...delico.com> [191124 18:00]:
> 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.

OK for now, let's assume we just need to call
clk_enable/disable from the PM runtime functions if a
clock exists.

Regards,

Tony