linux-kernel - Re: [PATCH 00/11] Add support for enhanced SPI for Designware SPI controllers

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Date:   Wed, 3 Aug 2022 21:56:00 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Sudip Mukherjee <sudip.mukherjee@...ive.com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        greentime.hu@...ive.com, jude.onyenegecha@...ive.com,
        william.salmon@...ive.com, adnan.chowdhury@...ive.com,
        ben.dooks@...ive.com, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        jeegar.lakhani@...ive.com
Subject: Re: [PATCH 00/11] Add support for enhanced SPI for Designware SPI
 controllers

Hi Sudip

On Tue, Aug 02, 2022 at 06:57:44PM +0100, Sudip Mukherjee wrote:
> Some Synopsys SSI controllers support enhanced SPI which includes
> Dual mode, Quad mode and Octal mode. DWC_ssi includes clock stretching
> feature in enhanced SPI modes which can be used to prevent FIFO underflow
> and overflow conditions while transmitting or receiving the data respectively.
> This is only tested on controller version 1.03a.
> 
> Ben Dooks (1):
>   spi: dw-apb-ssi: add generic 1.03a version

Thanks for the patchset. It's always welcome to have a new
functionality support. I'll have it reviewed on the next week. There
are several aspects like using version-based compatible string and new
capability flag I am the most worried about. They need to be
discussed first before proceeding with the rest of the things.

-Sergey

> 
> Sudip Mukherjee (10):
>   spi: dw: define capability for enhanced spi
>   spi: dw: add check for support of dual/quad/octal
>   spi: dw: define spi_frf for dual/quad/octal modes
>   spi: dw: use TMOD_RO to read in enhanced spi modes
>   spi: dw: define SPI_CTRLR0 register and its fields
>   spi: dw: update SPI_CTRLR0 register
>   spi: dw: update NDF while writing in enhanced spi mode
>   spi: dw: update buffer for enhanced spi mode
>   spi: dw: prepare the transfer routine for enhanced mode
>   spi: dw: initialize dwc-ssi-1.03a controller
> 
>  .../bindings/spi/snps,dw-apb-ssi.yaml         |   1 +
>  drivers/spi/spi-dw-core.c                     | 288 ++++++++++++++++--
>  drivers/spi/spi-dw-mmio.c                     |  10 +
>  drivers/spi/spi-dw.h                          |  19 ++
>  4 files changed, 291 insertions(+), 27 deletions(-)
> 
> -- 
> 2.30.2
>