linux-kernel - Re: [PATCH v6 03/11] spi: spi-mem: Convert Aspeed SMC driver to spi-mem

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Date:   Tue, 3 May 2022 12:55:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Cédric Le Goater <clg@...d.org>
Cc:     linux-spi@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Mark Brown <broonie@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-aspeed@...ts.ozlabs.org, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Tao Ren <rentao.bupt@...il.com>,
        Jae Hyun Yoo <quic_jaehyoo@...cinc.com>
Subject: Re: [PATCH v6 03/11] spi: spi-mem: Convert Aspeed SMC driver to
 spi-mem

On Tue, May 03, 2022 at 08:06:26AM +0200, Cédric Le Goater wrote:
> This SPI driver adds support for the Aspeed static memory controllers
> of the AST2600, AST2500 and AST2400 SoCs using the spi-mem interface.
> 
>  * AST2600 Firmware SPI Memory Controller (FMC)
>    . BMC firmware
>    . 3 chip select pins (CE0 ~ CE2)
>    . Only supports SPI type flash memory
>    . different segment register interface
>    . single, dual and quad mode.
> 
>  * AST2600 SPI Flash Controller (SPI1 and SPI2)
>    . host firmware
>    . 2 chip select pins (CE0 ~ CE1)
>    . different segment register interface
>    . single, dual and quad mode.
> 
>  * AST2500 Firmware SPI Memory Controller (FMC)
>    . BMC firmware
>    . 3 chip select pins (CE0 ~ CE2)
>    . supports SPI type flash memory (CE0-CE1)
>    . CE2 can be of NOR type flash but this is not supported by the driver
>    . single, dual mode.
> 
>  * AST2500 SPI Flash Controller (SPI1 and SPI2)
>    . host firmware
>    . 2 chip select pins (CE0 ~ CE1)
>    . single, dual mode.
> 
>  * AST2400 New Static Memory Controller (also referred as FMC)
>    . BMC firmware
>    . New register set
>    . 5 chip select pins (CE0 ∼ CE4)
>    . supports NOR flash, NAND flash and SPI flash memory.
>    . single, dual and quad mode.
> 
> Each controller has a memory range on which flash devices contents are
> mapped. Each device is assigned a window that can be changed at bootime
> with the Segment Address Registers.
> 
> Each SPI flash device can then be accessed in two modes: Command and
> User. When in User mode, SPI transfers are initiated with accesses to
> the memory segment of a device. When in Command mode, memory
> operations on the memory segment of a device generate SPI commands
> automatically using a Control Register for the settings.
> 
> This initial patch adds support for User mode. Command mode needs a little
> more work to check that the memory window on the AHB bus fits the device
> size. It will come later when support for direct mapping is added.
> 
> Single and dual mode RX transfers are supported. Other types than SPI
> are not supported.
> 
> Reviewed-by: Joel Stanley <joel@....id.au>
> Tested-by: Joel Stanley <joel@....id.au>
> Tested-by: Tao Ren <rentao.bupt@...il.com>
> Tested-by: Jae Hyun Yoo <quic_jaehyoo@...cinc.com>
> Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
> Signed-off-by: Cédric Le Goater <clg@...d.org>
> ---
>  drivers/mtd/spi-nor/controllers/aspeed-smc.c  | 921 ------------------
>  drivers/spi/spi-aspeed-smc.c                  | 717 ++++++++++++++
>  .../devicetree/bindings/mtd/aspeed-smc.txt    |  51 -

This belongs with the binding patch. But then it is converting rather 
than adding a binding. You should be converting the binding and then 
adding to it (like adding 2600 support).

>  MAINTAINERS                                   |   1 +
>  drivers/mtd/spi-nor/controllers/Kconfig       |  10 -
>  drivers/mtd/spi-nor/controllers/Makefile      |   1 -
>  drivers/spi/Kconfig                           |  11 +
>  drivers/spi/Makefile                          |   1 +
>  8 files changed, 730 insertions(+), 983 deletions(-)
>  delete mode 100644 drivers/mtd/spi-nor/controllers/aspeed-smc.c
>  create mode 100644 drivers/spi/spi-aspeed-smc.c
>  delete mode 100644 Documentation/devicetree/bindings/mtd/aspeed-smc.txt