linux-kernel - Re: [PATCH 0/5] imx: support noc settings with power domain

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Date:   Wed, 06 Apr 2022 11:47:54 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, djakov@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de
Cc:     festevam@...il.com, linux-imx@....com,
        laurent.pinchart@...asonboard.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 0/5] imx: support noc settings with power domain

Hi Peng,

Am Mittwoch, dem 06.04.2022 um 16:23 +0800 schrieb Peng Fan (OSS):
> From: Peng Fan <peng.fan@....com>
> 
> i.MX8MP has a design that NoC(Not main NoC) is distributed in multiple
> blocks, such as vpumix, hsiomix and etc. The access to NoC requires
> power domain on and blk ctrl settings configured.
> 
> So the design here is for mixes that not have blk-ctrl, configure
> the NoC in gpcv2 driver, for mixes that have blk-ctrl, configure
> the NoC in blk-ctrl drivers.
> 
> This v1 patchset not apply on Shawn's tree, I picked up Lucas's HSIO
> and Laurent's mediablk patches, then worked out this patchset:
> https://github.com/MrVan/linux/tree/noc-imx8mp
> 
> Note: This interconnect related functions not added. This patchset
> is only to replace the function did in NXP downstream:
> https://source.codeaurora.org/external/imx/imx-atf/tree/plat/imx/imx8m/imx8mp/gpc.c?h=lf_v2.4#n157

As a general comment I think this is implemented the wrong way around.

Neither GPC, nor the blk-ctrl should poke into the NoC registers
directly. The NoC driver should attach itself to the power domain via a
notifier (same as the blk-ctrl does with the GPC domains) and should do
the necessary NoC configuration when the power domain is powered up.

Regards,
Lucas
> 
> Peng Fan (5):
>   dt-bindings: interconnect: imx8m: Add bindings for imx8mp noc
>   arm64: dts: imx8mp: add noc node
>   soc: imx: gpcv2: support i.MX8MP NoC settings
>   soc: imx: imx8m-blk-ctrl: support i.MX8MP media blk ctrl noc settings
>   soc: imx: imx8mp-blk-ctrl: introduce HSIO blk ctrl noc settings
> 
>  .../bindings/interconnect/fsl,imx8m-noc.yaml  |   6 +
>  arch/arm64/boot/dts/freescale/imx8mp.dtsi     |   7 ++
>  drivers/soc/imx/gpcv2.c                       |  56 ++++++++-
>  drivers/soc/imx/imx8m-blk-ctrl.c              | 109 ++++++++++++++++++
>  drivers/soc/imx/imx8mp-blk-ctrl.c             |  74 ++++++++++++
>  5 files changed, 251 insertions(+), 1 deletion(-)
>