linux-kernel - Re: [PATCH v3 2/3] arm64: dts: qcom: Add header file for IPCC physical client IDs on Kaanapali platform

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Message-ID: <d3e4a3b1-4785-4b31-9db5-00ebb8704c01@oss.qualcomm.com>
Date: Mon, 3 Nov 2025 14:47:17 +0800
From: Jingyi Wang <jingyi.wang@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Manivannan Sadhasivam <mani@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, aiqun.yu@....qualcomm.com,
        tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
        yijie.yang@....qualcomm.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/3] arm64: dts: qcom: Add header file for IPCC
 physical client IDs on Kaanapali platform



On 11/2/2025 3:07 AM, Bjorn Andersson wrote:
> On Fri, Oct 31, 2025 at 12:41:45AM -0700, Jingyi Wang wrote:
> 
> Whenever you have a subject line that ends in "on <soc/platform>",
> that's a good indicator that you're missing something in the subject
> prefix.
> 
> Compare:
> arm64: dts: qcom: Add header file for IPCC physical client IDs on Kaanapali platform
> 
> with:
> arm64: dts: qcom: kaanapali: Add IPCC client IDs
> 
> 
> Also, now that this is "devicetree", it would make sense to merge them
> together with the users. Or at least after we've introduced
> kaanapali.dtsi...
> 
> 
> I don't think you need to resubmit this though, I can fix up the subject
> when I merge. But please get to the point where it makes sense to merge
> them as fast as possible.
> 
> Regards,
> Bjorn
> 

Got it.

Thanks,
Jingyi

>> On earlier platforms, Inter Process Communication Controller (IPCC) used
>> virtual client IDs and performed virtual-to-physical mapping in hardware,
>> so the IDs defined in dt-bindings/mailbox/qcom-ipcc.h are common across
>> platforms. Physical client IDs instead of virtual client IDs are used for
>> qcom new platforms like Kaanapali, which will be parsed by the devicetree
>> and passed to hardware to use Physical client IDs directly. Since physical
>> client IDs could vary across platforms, add a corresponding header file
>> for the Kaanapali platform.
>>
>> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>> ---
>>  arch/arm64/boot/dts/qcom/kaanapali-ipcc.h | 58 +++++++++++++++++++++++++++++++
>>  1 file changed, 58 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/kaanapali-ipcc.h b/arch/arm64/boot/dts/qcom/kaanapali-ipcc.h
>> new file mode 100644
>> index 000000000000..125375a4aac0
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/qcom/kaanapali-ipcc.h
>> @@ -0,0 +1,58 @@
>> +/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
>> +/*
>> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
>> + */
>> +
>> +#ifndef __DTS_KAANAPALI_MAILBOX_IPCC_H
>> +#define __DTS_KAANAPALI_MAILBOX_IPCC_H
>> +
>> +/* Physical client IDs */
>> +#define IPCC_MPROC_AOP			0
>> +#define IPCC_MPROC_TZ			1
>> +#define IPCC_MPROC_MPSS			2
>> +#define IPCC_MPROC_LPASS		3
>> +#define IPCC_MPROC_SDC			4
>> +#define IPCC_MPROC_CDSP			5
>> +#define IPCC_MPROC_APSS			6
>> +#define IPCC_MPROC_SOCCP		13
>> +#define IPCC_MPROC_DCP			14
>> +#define IPCC_MPROC_SPSS			15
>> +#define IPCC_MPROC_TME			16
>> +#define IPCC_MPROC_WPSS			17
>> +
>> +#define IPCC_COMPUTE_L0_CDSP		2
>> +#define IPCC_COMPUTE_L0_APSS		3
>> +#define IPCC_COMPUTE_L0_GPU		4
>> +#define IPCC_COMPUTE_L0_CVP		8
>> +#define IPCC_COMPUTE_L0_CAM		9
>> +#define IPCC_COMPUTE_L0_CAM1		10
>> +#define IPCC_COMPUTE_L0_DCP		11
>> +#define IPCC_COMPUTE_L0_VPU		12
>> +#define IPCC_COMPUTE_L0_SOCCP		16
>> +
>> +#define IPCC_COMPUTE_L1_CDSP		2
>> +#define IPCC_COMPUTE_L1_APSS		3
>> +#define IPCC_COMPUTE_L1_GPU		4
>> +#define IPCC_COMPUTE_L1_CVP		8
>> +#define IPCC_COMPUTE_L1_CAM		9
>> +#define IPCC_COMPUTE_L1_CAM1		10
>> +#define IPCC_COMPUTE_L1_DCP		11
>> +#define IPCC_COMPUTE_L1_VPU		12
>> +#define IPCC_COMPUTE_L1_SOCCP		16
>> +
>> +#define IPCC_PERIPH_CDSP		2
>> +#define IPCC_PERIPH_APSS		3
>> +#define IPCC_PERIPH_PCIE0		4
>> +#define IPCC_PERIPH_PCIE1		5
>> +
>> +#define IPCC_FENCE_CDSP			2
>> +#define IPCC_FENCE_APSS			3
>> +#define IPCC_FENCE_GPU			4
>> +#define IPCC_FENCE_CVP			8
>> +#define IPCC_FENCE_CAM			8
>> +#define IPCC_FENCE_CAM1			10
>> +#define IPCC_FENCE_DCP			11
>> +#define IPCC_FENCE_VPU			20
>> +#define IPCC_FENCE_SOCCP		24
>> +
>> +#endif
>>
>> -- 
>> 2.25.1
>>