linux-kernel - Re: [PATCH v1 0/2] spi: cadence-qspi: Add cadence-qspi support for Intel LGM SoC

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Date:   Tue, 17 Sep 2019 11:31:03 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Vignesh Raghavendra <vigneshr@...com>, broonie@...nel.org
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com
Subject: Re: [PATCH v1 0/2] spi: cadence-qspi: Add cadence-qspi support for
 Intel LGM SoC

Hi Vignesh,

    Thank you for the review comments and suggestions.

On 17/9/2019 12:50 AM, Vignesh Raghavendra wrote:
> Hi,
>
> On 16/09/19 1:08 PM, Ramuthevar,Vadivel MuruganX wrote:
>> patch 1: Add YAML for cadence-qspi devicetree cdocumentation.
>> patch 2: cadence-qspi controller driver to support QSPI-NAND flash
>> using existing spi-nand framework with legacy spi protocol.
> Nope, you cannot have two drivers for the same IP (i.e Cadence QSPI)
> just to support to different types of SPI memories. This is the reason
> why spi_mem_ops was introduced.
>
> Please rewrite this driver over to use spi_mem_ops (instead of using
> generic SPI xfers) so that same driver supports both SPI-NOR and
> SPI-NAND flashes. Once that's done drivers/mtd/spi-nor/cadence-quadspi.c
> can be deleted.
>
> There are few existing examples of spi_mem_ops users in drivers/spi/
> (git grep spi_mem_ops) and materials here on how to write such a driver:
>
> [1]
> https://bootlin.com/blog/spi-mem-bringing-some-consistency-to-the-spi-memory-ecosystem/
> [2] https://www.youtube.com/watch?v=PkWbuLM_gmU
Agreed!, Surely let me go through the above link and put my effort to 
rewrite the drivers as per your suggestions.

---
With Best Regards
Vadivel Murugan R

>> Ramuthevar Vadivel Murugan (2):
>>    dt-bindings: spi: Add support for cadence-qspi IP Intel LGM SoC
>>    spi: cadence-qspi: Add QSPI support for Intel LGM SoC
>>
>>   .../devicetree/bindings/spi/cadence,qspi-nand.yaml |  84 +++
>>   drivers/spi/Kconfig                                |   9 +
>>   drivers/spi/Makefile                               |   1 +
>>   drivers/spi/spi-cadence-qspi-apb.c                 | 644 +++++++++++++++++++++
>>   drivers/spi/spi-cadence-qspi-apb.h                 | 174 ++++++
>>   drivers/spi/spi-cadence-qspi.c                     | 461 +++++++++++++++
>>   drivers/spi/spi-cadence-qspi.h                     |  73 +++
>>   7 files changed, 1446 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/spi/cadence,qspi-nand.yaml
>>   create mode 100644 drivers/spi/spi-cadence-qspi-apb.c
>>   create mode 100644 drivers/spi/spi-cadence-qspi-apb.h
>>   create mode 100644 drivers/spi/spi-cadence-qspi.c
>>   create mode 100644 drivers/spi/spi-cadence-qspi.h
>>