linux-kernel - Re: [PATCH 0/7] Add FFT Support for R-Car Gen3 devices

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Date:   Fri, 26 Feb 2021 14:20:48 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Dirk Behme <Dirk.Behme@...bosch.com>,
        Peter Erben <Peter.Erben@...bosch.com>
Subject: Re: [PATCH 0/7] Add FFT Support for R-Car Gen3 devices

Hi Fabrizio,

On Thu, Feb 25, 2021 at 10:51:40PM +0000, Fabrizio Castro wrote:
> The DAB hardware accelerator found on R-Car E3 (a.k.a. r8a77990)
> and R-Car M3-N (a.k.a. r8a77965) devices is a hardware accelerator
> for software DAB demodulators.
> It consists of one FFT (Fast Fourier Transform) module and one
> decoder module, compatible with DAB specification (ETSI EN 300 401
> and ETSI TS 102 563).
> The decoder module can perform FIC decoding and MSC decoding
> processing from de-puncture to final decoded result.
> 
> This series adds FFT support only for R-Car E3 and R-Car M3-N,
> FIC and MSC support will be added later on.

Out of curiosity, could the FFT module be used as an accelerator for 2D
FFT on images ?

> Fabrizio Castro (7):
>   clk: renesas: r8a77990: Add DAB clock
>   clk: renesas: r8a77965: Add DAB clock
>   dt-bindings: misc: Add binding for R-Car DAB
>   misc: Add driver for DAB IP found on Renesas R-Car devices
>   arm64: dts: renesas: r8a77990: Add DAB support
>   arm64: dts: renesas: r8a77965: Add DAB support
>   arm64: configs: Add R-Car DAB support
> 
>  .../devicetree/bindings/misc/renesas,dab.yaml |  75 ++++++++
>  MAINTAINERS                                   |   7 +
>  arch/arm64/boot/dts/renesas/r8a77965.dtsi     |  12 ++
>  arch/arm64/boot/dts/renesas/r8a77990.dtsi     |  12 ++
>  arch/arm64/configs/defconfig                  |   1 +
>  drivers/clk/renesas/r8a77965-cpg-mssr.c       |   1 +
>  drivers/clk/renesas/r8a77990-cpg-mssr.c       |   1 +
>  drivers/misc/Kconfig                          |   1 +
>  drivers/misc/Makefile                         |   1 +
>  drivers/misc/rcar_dab/Kconfig                 |  11 ++
>  drivers/misc/rcar_dab/Makefile                |   8 +
>  drivers/misc/rcar_dab/rcar_dev.c              | 176 ++++++++++++++++++
>  drivers/misc/rcar_dab/rcar_dev.h              | 116 ++++++++++++
>  drivers/misc/rcar_dab/rcar_fft.c              | 160 ++++++++++++++++
>  include/uapi/linux/rcar_dab.h                 |  35 ++++
>  15 files changed, 617 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/renesas,dab.yaml
>  create mode 100644 drivers/misc/rcar_dab/Kconfig
>  create mode 100644 drivers/misc/rcar_dab/Makefile
>  create mode 100644 drivers/misc/rcar_dab/rcar_dev.c
>  create mode 100644 drivers/misc/rcar_dab/rcar_dev.h
>  create mode 100644 drivers/misc/rcar_dab/rcar_fft.c
>  create mode 100644 include/uapi/linux/rcar_dab.h

-- 
Regards,

Laurent Pinchart