linux-kernel - Re: [PATCH V6 08/13] interconnect: mediatek: Add interconnect provider driver

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Message-ID: <a416a55c-0a7e-6505-ef53-b03f5dbc6cdc@linaro.org>
Date:   Wed, 6 Jan 2021 10:14:26 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Henry Chen <henryc.chen@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Ryan Case <ryandcase@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Boichat <drinkcat@...gle.com>,
        Fan Chen <fan.chen@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Arvin Wang <arvin.wang@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH V6 08/13] interconnect: mediatek: Add interconnect
 provider driver

On 1/6/21 09:30, Henry Chen wrote:
> On Mon, 2021-01-04 at 20:36 +0200, Georgi Djakov wrote:
>> On 12/24/20 08:08, Henry Chen wrote:
>>> Introduce Mediatek MT6873/MT8183/MT8192 specific provider driver
>>> using the interconnect framework.
>>>
>>>                ICC provider         ICC Nodes
>>>                                 ----          ----
>>>                ---------       |CPU |   |--- |VPU |
>>>       -----   |         |-----  ----    |     ----
>>>      |DRAM |--|DRAM     |       ----    |     ----
>>>      |     |--|scheduler|----- |GPU |   |--- |DISP|
>>>      |     |--|(EMI)    |       ----    |     ----
>>>      |     |--|         |       -----   |     ----
>>>       -----   |         |----- |MMSYS|--|--- |VDEC|
>>>                ---------        -----   |     ----
>>>                  /|\                    |     ----
>>>                   |change DRAM freq     |--- |VENC|
>>>                ----------               |     ----
>>>               |  DVFSR   |              |
>>>               |          |              |     ----
>>>                ----------               |--- |IMG |
>>>                                         |     ----
>>>                                         |     ----
>>>                                         |--- |CAM |
>>>                                               ----
>>>
>>> Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
>>> ---
>>>    drivers/interconnect/Kconfig            |   1 +
>>>    drivers/interconnect/Makefile           |   1 +
>>>    drivers/interconnect/mediatek/Kconfig   |  13 ++
>>>    drivers/interconnect/mediatek/Makefile  |   3 +
>>>    drivers/interconnect/mediatek/mtk-emi.c | 330 ++++++++++++++++++++++++++++++++
>>>    5 files changed, 348 insertions(+)
>>>    create mode 100644 drivers/interconnect/mediatek/Kconfig
>>>    create mode 100644 drivers/interconnect/mediatek/Makefile
>>>    create mode 100644 drivers/interconnect/mediatek/mtk-emi.c
>>>
>>> diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig
>>> index 5b7204e..e939f5a 100644
>>> --- a/drivers/interconnect/Kconfig
>>> +++ b/drivers/interconnect/Kconfig
>>> @@ -13,5 +13,6 @@ if INTERCONNECT
>>>    
>>>    source "drivers/interconnect/imx/Kconfig"
>>>    source "drivers/interconnect/qcom/Kconfig"
>>> +source "drivers/interconnect/mediatek/Kconfig"
>>
>> Sort alphabetically please.
> Ok
>>
>>>    
>>>    endif
>>> diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile
>>> index d203520..0643a24 100644
>>> --- a/drivers/interconnect/Makefile
>>> +++ b/drivers/interconnect/Makefile
>>> @@ -6,3 +6,4 @@ icc-core-objs				:= core.o bulk.o
>>>    obj-$(CONFIG_INTERCONNECT)		+= icc-core.o
>>>    obj-$(CONFIG_INTERCONNECT_IMX)		+= imx/
>>>    obj-$(CONFIG_INTERCONNECT_QCOM)		+= qcom/
>>> +obj-$(CONFIG_INTERCONNECT_MTK)		+= mediatek/
>>
>> Ditto.
> Ok
>>
>>> diff --git a/drivers/interconnect/mediatek/Kconfig b/drivers/interconnect/mediatek/Kconfig
>>> new file mode 100644
>>> index 0000000..972d3bb
>>> --- /dev/null
>>> +++ b/drivers/interconnect/mediatek/Kconfig
>>> @@ -0,0 +1,13 @@
>>> +config INTERCONNECT_MTK
>>> +	bool "Mediatek Network-on-Chip interconnect drivers"
>>> +	depends on ARCH_MEDIATEK
>>> +	help
>>> +	  Support for Mediatek's Network-on-Chip interconnect hardware.
>>> +
>>> +config INTERCONNECT_MTK_EMI
>>> +	tristate "Mediatek EMI interconnect driver"
>>> +	depends on INTERCONNECT_MTK
>>> +	depends on (MTK_DVFSRC && OF)
>>
>> Would it be possible to enable COMPILE_TEST?
> Do you means change to "depends on (MTK_DVFSRC && OF) || COMPILE_TEST" ?

Yeah, there is a stub for mtk_dvfsrc_send_request(). Maybe we could even change
it for INTERCONNECT_MTK to something like:
	depends on ARCH_MEDIATEK || COMPILE_TEST
Will this work?

Thanks,
Georgi