linux-kernel - Re: [PATCH v7 06/12] ARM: DTS: omap4: add sgx gpu child node

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Date:   Tue, 28 Apr 2020 09:59:22 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     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>,
        Tony Lindgren <tony@...mide.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jonathan Bakker <xc-racer2@...e.ca>,
        Philipp Rossak <embed3d@...il.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        openpvrsgx-devgroup@...ux.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v7 06/12] ARM: DTS: omap4: add sgx gpu child node

Hi Paul,

> Am 26.04.2020 um 14:50 schrieb Paul Cercueil <paul@...pouillou.net>:
> 
> Hi Nikolaus,
> 
> Le ven. 24 avril 2020 à 22:34, H. Nikolaus Schaller <hns@...delico.com> a écrit :
>> Add SGX GPU node with interrupt. Tested on PandaBoard ES.
>> Since omap4420/30/60 and omap4470 come with different SGX variants
>> we need to introduce a new omap4470.dtsi. If an omap4470 board
>> does not want to use SGX it is no problem to still include
>> omap4460.dtsi.
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>> ---
>> arch/arm/boot/dts/omap4.dtsi   | 11 ++++++-----
>> arch/arm/boot/dts/omap4470.dts | 15 +++++++++++++++
>> 2 files changed, 21 insertions(+), 5 deletions(-)
>> create mode 100644 arch/arm/boot/dts/omap4470.dts
>> diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
>> index 763bdea8c829..15ff3d7146af 100644
>> --- a/arch/arm/boot/dts/omap4.dtsi
>> +++ b/arch/arm/boot/dts/omap4.dtsi
>> @@ -389,7 +389,7 @@ abb_iva: regulator-abb-iva {
>> 			status = "disabled";
>> 		};
>> -		target-module@...00000 {
>> +		sgx_module: target-module@...00000 {
>> 			compatible = "ti,sysc-omap4", "ti,sysc";
>> 			reg = <0x5600fe00 0x4>,
>> 			      <0x5600fe10 0x4>;
>> @@ -408,10 +408,11 @@ target-module@...00000 {
>> 			#size-cells = <1>;
>> 			ranges = <0 0x56000000 0x2000000>;
>> -			/*
>> -			 * Closed source PowerVR driver, no child device
>> -			 * binding or driver in mainline
>> -			 */
>> +			gpu: gpu@0 {
>> +				compatible = "ti,omap4-sgx540-120", "img,sgx540-120", "img,sgx540";
>> +				reg = <0x0 0x2000000>;	/* 32MB */
>> +				interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
>> +			};
>> 		};
>> 		/*
>> diff --git a/arch/arm/boot/dts/omap4470.dts b/arch/arm/boot/dts/omap4470.dts
>> new file mode 100644
>> index 000000000000..f29c581300bf
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/omap4470.dts

^^^ there is also a missing "i" in the file name

>> @@ -0,0 +1,15 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Device Tree Source for OMAP4470 SoC
>> + *
>> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
>> + *
>> + * This file is licensed under the terms of the GNU General Public License
>> + * version 2.  This program is licensed "as is" without any warranty of any
>> + * kind, whether express or implied.
>> + */
>> +#include "omap4460.dtsi"
>> +
>> +&sgx {
> 
> Does this even compile?

Good question.

So far there is no well known eval board in mainline that #includes this .dtsi (because it is new) and therefore it passes any compile tests.

  DTC     arch/arm/boot/dts/omap4470-test.dtb - due to target missing
Error: arch/arm/boot/dts/omap4470.dtsi:13.1-5 Label or path sgx not found

I have now added a dummy board (not to be mainlined) for my own compile test...

> 
> The node's handle is named sgx_module, not sgx.

Indeed. A fix is queued for v8.

BR and thanks,
Nikolaus