linux-kernel - Re: [PATCH v3 1/2] arm64: tegra: add ACONNECT, ADMA and AGIC nodes

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Message-ID: <7a8426e9-a2c3-5cf6-9088-8ad81f558488@nvidia.com>
Date:   Thu, 13 Jun 2019 11:21:45 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Sameer Pujar <spujar@...dia.com>, <thierry.reding@...il.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <mkumard@...dia.com>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] arm64: tegra: add ACONNECT, ADMA and AGIC nodes


On 13/06/2019 10:47, Sameer Pujar wrote:
> 
> On 6/13/2019 3:12 PM, Jon Hunter wrote:
>> On 13/06/2019 10:10, Sameer Pujar wrote:
>>> Add DT nodes for following devices on Tegra186 and Tegra194
>>>   * ACONNECT
>>>   * ADMA
>>>   * AGIC
>>>
>>> Signed-off-by: Sameer Pujar <spujar@...dia.com>
>>> ---
>>>   changes in current revision
>>>    * use single address range for all APE modules
>>>    * fix address range for agic
>>>
>>>   arch/arm64/boot/dts/nvidia/tegra186.dtsi | 67
>>> ++++++++++++++++++++++++++++++++
>>>   arch/arm64/boot/dts/nvidia/tegra194.dtsi | 67
>>> ++++++++++++++++++++++++++++++++
>>>   2 files changed, 134 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>>> b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>>> index 426ac0b..b4d735e 100644
>>> --- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>>> +++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>>> @@ -1295,4 +1295,71 @@
>>>                   (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
>>>           interrupt-parent = <&gic>;
>>>       };
>>> +
>>> +    aconnect@...1000 {
>> This address does not look correct. This appears to be the address of
>> the AGIC. I think it should be 2900000, however, I also wonder if we
>> should even bother with an address for the aconnect as this is just a
>> bus and we don't specific a 'reg' property.
> Do you mean, should be ok to just mention "aconnect {"?

I did a bit more reading and for Tegra186 there are no registers
implement for the aconnect (which is different from Tegra210) and so in
this case we should just have ...

	aconnect {
		...

>>
>>> +        compatible = "nvidia,tegra210-aconnect";
>>> +        clocks = <&bpmp TEGRA186_CLK_APE>,
>>> +             <&bpmp TEGRA186_CLK_APB2APE>;
>>> +        clock-names = "ape", "apb2ape";
>>> +        power-domains = <&bpmp TEGRA186_POWER_DOMAIN_AUD>;
>>> +        #address-cells = <1>;
>>> +        #size-cells = <1>;
>>> +        ranges = <0x02900000 0x0 0x02900000 0x1FFFFF>;
>> This should be 0x1fffff.
> done

Sorry this should be 0x200000.

Cheers
Jon

-- 
nvpublic