linux-kernel - RE: [RFC PATCH 0/3] Add support of busfreq

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Date:   Fri, 15 Mar 2019 02:39:48 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Alexandre Bailon <abailon@...libre.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "georgi.djakov@...aro.org" <georgi.djakov@...aro.org>
CC:     "mturquette@...libre.com" <mturquette@...libre.com>,
        "ptitiano@...libre.com" <ptitiano@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Zening Wang <zening.wang@....com>,
        "khilman@...libre.com" <khilman@...libre.com>,
        "ccaione@...libre.com" <ccaione@...libre.com>,
        Jacky Bai <ping.bai@....com>,
        Leonard Crestez <leonard.crestez@....com>,
        dl-linux-imx <linux-imx@....com>,
        Ranjani Vaidyanathan <ranjani.vaidyanathan@....com>
Subject: RE: [RFC PATCH 0/3] Add support of busfreq

+Jacky and Leonard, Ranjani

Hi Alexandre,

> From: Alexandre Bailon [mailto:abailon@...libre.com]
> 
> This series implements busfreq, a framework used in MXP's tree to scale the
> interconnect and dram frequencies.
> In the vendor tree, device's driver request for a performance level, which is
> used to scale the frequencies.
> This series implements it using the interconnect framework.
> Devices' driver request for bandwidth which is use by busfreq to determine a
> performance level, and then scale the frequency.
> 
> Busfreq is quite generic. It could be used for any i.MX SoC.
> A busfreq platform driver just have to define a list of interconnect nodes, and
> some OPPs.
> 

It's really great to see this patch series.
And it should be the correct direction we're heading to upstream busfreq support.

> This series is sent as RFC mostly because the current support of i.MX SoC won't
> benefit of busfreq framework, because the clocks' driver don't support
> interconnect / dram frequency scaling.
> As exemple, this series implements busfreq for i.MX8MM whose upstreaming
> is in progress. Because this relies on ATF to do the frequency scaling, it won't
> be hard make it work.
> 

How can I test this patch series?
Any additional patches you can share with us?
Or what else we need to do to test it? We can help with it.

Regards
Dong Aisheng

> As exemple, this series implements busfreq for Alexandre Bailon (3):
>   drivers: interconnect: Add a driver for i.MX SoC
>   drivers: interconnect: imx: Add support of i.MX8MM
>   dt-bindings: interconnect: Document fsl,busfreq-imx8mm bindings
> 
>  .../bindings/interconnect/imx8mm.txt          |  24 +
>  drivers/interconnect/Kconfig                  |   1 +
>  drivers/interconnect/Makefile                 |   1 +
>  drivers/interconnect/imx/Kconfig              |  17 +
>  drivers/interconnect/imx/Makefile             |   2 +
>  drivers/interconnect/imx/busfreq-imx8mm.c     | 132 ++++
>  drivers/interconnect/imx/busfreq.c            | 570
> ++++++++++++++++++
>  drivers/interconnect/imx/busfreq.h            | 123 ++++
>  include/dt-bindings/interconnect/imx8mm.h     |  37 ++
>  9 files changed, 907 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/interconnect/imx8mm.txt
>  create mode 100644 drivers/interconnect/imx/Kconfig  create mode
> 100644 drivers/interconnect/imx/Makefile  create mode 100644
> drivers/interconnect/imx/busfreq-imx8mm.c
>  create mode 100644 drivers/interconnect/imx/busfreq.c
>  create mode 100644 drivers/interconnect/imx/busfreq.h
>  create mode 100644 include/dt-bindings/interconnect/imx8mm.h
> 
> --
> 2.19.2