linux-kernel - Re: [PATCH v2 1/3] dt-bindings: Document JZ47xx VPU auxiliary processor

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Message-Id: <1566384459.1884.0@crapouillou.net>
Date:   Wed, 21 Aug 2019 12:47:39 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Rob Herring <robh@...nel.org>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Paul Burton <paul.burton@...s.com>, od@...c.me,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: Document JZ47xx VPU auxiliary
 processor

Hi Rob,


Le mar. 20 août 2019 à 22:50, Rob Herring <robh@...nel.org> a écrit :
> On Mon, Jul 29, 2019 at 02:31:07PM -0400, Paul Cercueil wrote:
>>  Inside the Video Processing Unit (VPU) of the recent JZ47xx SoCs 
>> from
>>  Ingenic is a second Xburst MIPS CPU very similar to the main core.
>>  This document describes the devicetree bindings for this auxiliary
>>  processor.
>> 
>>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>>  ---
>> 
>>  Notes:
>>      v2: Update TCSM0 address in example
>> 
>>   .../bindings/remoteproc/ingenic,vpu.txt       | 36 
>> +++++++++++++++++++
>>   1 file changed, 36 insertions(+)
>>   create mode 100644 
>> Documentation/devicetree/bindings/remoteproc/ingenic,vpu.txt
>> 
>>  diff --git 
>> a/Documentation/devicetree/bindings/remoteproc/ingenic,vpu.txt 
>> b/Documentation/devicetree/bindings/remoteproc/ingenic,vpu.txt
>>  new file mode 100644
>>  index 000000000000..576f9e582780
>>  --- /dev/null
>>  +++ b/Documentation/devicetree/bindings/remoteproc/ingenic,vpu.txt
>>  @@ -0,0 +1,36 @@
>>  +* Ingenic JZ47xx auxiliary processor
>>  +
>>  +Inside the Video Processing Unit (VPU) of the recent JZ47xx SoCs 
>> from Ingenic
>>  +is a second Xburst MIPS CPU very similar to the main core.
>>  +This document describes the devicetree bindings for this auxiliary 
>> processor.
>>  +
>>  +Required properties:
>>  +- compatible: Should be "ingenic,jz4770-vpu-rproc"
>>  +- reg: Must contain the registers location and length for:
>>  +  * the auxiliary processor,
>>  +  * the Tightly Coupled Shared Memory 0 (TCSM0),
>>  +  * the Tightly Coupled Shared Memory 1 (TCSM1),
>>  +  * the shared SRAM.
>>  +- reg-names: Must contain "aux", "tcsm0", "tcsm1", "sram".
>>  +- clocks: Clock specifier for the AUX and VPU clocks.
>>  +- clock-names: Must contain "aux", "vpu".
>>  +- interrupts: Interrupt specifier for the VPU hardware block.
>>  +
>>  +Example:
>>  +
>>  +vpu: cpu@...a0000 {
> 
> cpu is reserved for CPUs under /cpus/. Use video-codec or 
> video-decoder
> or ?? It's not clear what type of video processing this does.

Hardware decode and encode of mpeg-2 and h264. I guess I'll use 
'video-decoder' then.


> 
>>  +	compatible = "ingenic,jz4770-vpu-rproc";
>>  +
>>  +	reg = <0x132a0000 0x20 /* AUX */
>>  +		   0x132b0000 0x4000 /* TCSM0 */
>>  +		   0x132c0000 0xc000 /* TCSM1 */
>>  +		   0x132f0000 0x7000 /* SRAM */
>>  +	>;
>>  +	reg-names = "aux", "tcsm0", "tcsm1", "sram";
>>  +
>>  +	clocks = <&cgu JZ4770_CLK_AUX>, <&cgu JZ4770_CLK_VPU>;
>>  +	clock-names = "aux", "vpu";
>>  +
>>  +	interrupt-parent = <&cpuintc>;
>>  +	interrupts = <3>;
>>  +};
>>  --
>>  2.21.0.593.g511ec345e18
>>