linux-kernel - Re: [PATCH v3 0/5] Reset driver for IMX8MQ VPU hardware block

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Message-ID: <20210308182217.GA2735443@robh.at.kernel.org>
Date:   Mon, 8 Mar 2021 11:22:17 -0700
From:   Rob Herring <robh@...nel.org>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     p.zabel@...gutronix.de, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com, ezequiel@...labora.com,
        mchehab@...nel.org, gregkh@...uxfoundation.org,
        kernel@...gutronix.de, linux-imx@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, devel@...verdev.osuosl.org,
        kernel@...labora.com
Subject: Re: [PATCH v3 0/5] Reset driver for IMX8MQ VPU hardware block

On Mon, Mar 01, 2021 at 04:17:49PM +0100, Benjamin Gaignard wrote:
> The two VPUs inside IMX8MQ share the same control block which can be see
> as a reset hardware block.
> In order to be able to add the second VPU (for HECV decoding) it will be
> more handy if the both VPU drivers instance don't have to share the
> control block registers. This lead to implement it as an independ reset 
> driver and to change the VPU driver to use it.
> 
> Please note that this series break the compatibility between the DTB and
> kernel. This break is limited to IMX8MQ SoC and is done when the driver
> is still in staging directory.

As this information will be lost, please put in the binding and dts 
patch.

> 
> version 3:
> - Fix error in VPU example node
> 
> version 2:
> - Document the change in VPU bindings
>  
> Benjamin Gaignard (5):
>   dt-bindings: reset: IMX8MQ VPU reset
>   dt-bindings: media: IMX8MQ VPU: document reset usage
>   reset: Add reset driver for IMX8MQ VPU block
>   media: hantro: Use reset driver
>   arm64: dts: imx8mq: Use reset driver for VPU hardware block
> 
>  .../bindings/media/nxp,imx8mq-vpu.yaml        |  14 +-
>  .../bindings/reset/fsl,imx8mq-vpu-reset.yaml  |  54 ++++++
>  arch/arm64/boot/dts/freescale/imx8mq.dtsi     |  31 +++-
>  drivers/reset/Kconfig                         |   8 +
>  drivers/reset/Makefile                        |   1 +
>  drivers/reset/reset-imx8mq-vpu.c              | 169 ++++++++++++++++++
>  drivers/staging/media/hantro/Kconfig          |   1 +
>  drivers/staging/media/hantro/imx8m_vpu_hw.c   |  61 ++-----
>  include/dt-bindings/reset/imx8mq-vpu-reset.h  |  16 ++
>  9 files changed, 294 insertions(+), 61 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/reset/fsl,imx8mq-vpu-reset.yaml
>  create mode 100644 drivers/reset/reset-imx8mq-vpu.c
>  create mode 100644 include/dt-bindings/reset/imx8mq-vpu-reset.h
> 
> -- 
> 2.25.1
>