linux-kernel - Re: [PATCH v2 1/2] dt-bindings: interconnect: Add OSM L3 DT bindings

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Date:   Tue, 01 Oct 2019 17:50:49 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Georgi Djakov <georgi.djakov@...aro.org>
Cc:     robh+dt@...nel.org, bjorn.andersson@...aro.org, agross@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, mark.rutland@....com,
        evgreen@...omium.org, daidavid1@...eaurora.org,
        saravanak@...gle.com, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: interconnect: Add OSM L3 DT bindings

Hey Georgi,

On 2019-09-27 04:46, Georgi Djakov wrote:
> Hi Sibi,
> 
> On 8/21/19 02:11, Sibi Sankar wrote:
>> Add bindings for Operating State Manager (OSM) L3 interconnect 
>> provider
>> on SDM845 SoCs.
>> 
>> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
>> ---
>>  .../bindings/interconnect/qcom,osm-l3.yaml    | 56 
>> +++++++++++++++++++
>>  .../dt-bindings/interconnect/qcom,osm-l3.h    | 12 ++++
>>  2 files changed, 68 insertions(+)
>>  create mode 100644 
>> Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>>  create mode 100644 include/dt-bindings/interconnect/qcom,osm-l3.h
>> 
>> diff --git 
>> a/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml 
>> b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>> new file mode 100644
>> index 0000000000000..dab2b6875ab27
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>> @@ -0,0 +1,56 @@
>> +# SPDX-License-Identifier: BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/interconnect/qcom,osm-l3.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Operating State Manager (OSM) L3 Interconnect 
>> Provider
>> +
>> +maintainers:
>> +  - Sibi Sankar <sibis@...eaurora.org>
>> +
>> +description:
>> +  L3 cache bandwidth requirements on Qualcomm SoCs is serviced by the 
>> OSM.
>> +  The OSM L3 interconnect provider aggregates the L3 bandwidth 
>> requests
>> +  from CPU/GPU and relays it to the OSM.
>> +
>> +properties:
>> +  compatible:
>> +    const: "qcom,sdm845-osm-l3"
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    items:
>> +      - description: xo clock
>> +      - description: alternate clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: xo
>> +      - const: alternate
>> +
>> +  '#interconnect-cells':
>> +    const: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - '#interconnect-cells'
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    osm_l3: interconnect@...41000 {
>> +      compatible = "qcom,sdm845-osm-l3";
>> +      reg = <0x17d41000 0x1400>;
>> +
>> +      clocks = <&rpmhcc 0>, <&gcc 165>;
>> +      clock-names = "xo", "alternate";
>> +
>> +      #interconnect-cells = <1>;
>> +    };
> 
> Are we going to do the bandwidth scaling from some cpufreq driver? 
> Under which
> DT node will we put the "interconnects" property?

Its still undecided :( unfortunately.
Using Saravana's series means that
bandwidth scaling will be done from
the cpufreq driver. The property
will be a part of the cpu-nodes. But
the part of adding the bw opp-tables
also to cpufreq driver or nodes doesn't
seem correct to me.

> 
> Thanks,
> Georgi
> 
>> diff --git a/include/dt-bindings/interconnect/qcom,osm-l3.h 
>> b/include/dt-bindings/interconnect/qcom,osm-l3.h
>> new file mode 100644
>> index 0000000000000..54858ff7674d7
>> --- /dev/null
>> +++ b/include/dt-bindings/interconnect/qcom,osm-l3.h
>> @@ -0,0 +1,12 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2019 The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#ifndef __DT_BINDINGS_INTERCONNECT_QCOM_OSM_L3_H
>> +#define __DT_BINDINGS_INTERCONNECT_QCOM_OSM_L3_H
>> +
>> +#define MASTER_OSM_L3_APPS	0
>> +#define SLAVE_OSM_L3		1
>> +
>> +#endif
>> 

-- 
-- Sibi Sankar --
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.