[U-Boot] [RFC PATCH 10/20] spi: Extend the core to ease integration of SPI memory controllers

[Jagan Teki]

On Wed, Jun 6, 2018 at 9:00 PM, Miquel Raynal <miquel.raynal at bootlin.com> wrote:
> From: Boris Brezillon <boris.brezillon at bootlin.com>
>
> Some controllers are exposing high-level interfaces to access various
> kind of SPI memories. Unfortunately they do not fit in the current
> spi_controller model and usually have drivers placed in
> drivers/mtd/spi-nor which are only supporting SPI NORs and not SPI
> memories in general.
>
> This is an attempt at defining a SPI memory interface which works for
> all kinds of SPI memories (NORs, NANDs, SRAMs).
>
> Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> ---
>  drivers/spi/Kconfig   |   7 +
>  drivers/spi/Makefile  |   1 +
>  drivers/spi/spi-mem.c | 500 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/spi-mem.h     | 258 ++++++++++++++++++++++++++
>  include/spi.h         |  11 ++
>  5 files changed, 777 insertions(+)
>  create mode 100644 drivers/spi/spi-mem.c
>  create mode 100644 include/spi-mem.h
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 235a8c7d73..0ee371b2d9 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -15,6 +15,13 @@ config DM_SPI
>
>  if DM_SPI
>
> +config SPI_MEM
> +       bool "SPI memory extension"
> +       help
> +         Enable this option if you want to enable the SPI memory extension.
> +         This extension is meant to simplify interaction with SPI memories
> +         by providing an high-level interface to send memory-like commands.
> +
>  config ALTERA_SPI
>         bool "Altera SPI driver"
>         help
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 4b6000fd9a..982529a0e6 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -10,6 +10,7 @@ ifdef CONFIG_DM_SPI
>  obj-y += spi-uclass.o
>  obj-$(CONFIG_SANDBOX) += spi-emul-uclass.o
>  obj-$(CONFIG_SOFT_SPI) += soft_spi.o
> +obj-$(CONFIG_SPI_MEM) += spi-mem.o
>  else
>  obj-y += spi.o
>  obj-$(CONFIG_SOFT_SPI) += soft_spi_legacy.o
> diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
> new file mode 100644
> index 0000000000..1aabe56819
> --- /dev/null
> +++ b/drivers/spi/spi-mem.c
> @@ -0,0 +1,500 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 Exceet Electronics GmbH
> + * Copyright (C) 2018 Bootlin
> + *
> + * Author: Boris Brezillon <boris.brezillon at bootlin.com>
> + */
> +
> +#ifndef __UBOOT__
> +#include <linux/dmaengine.h>
> +#include <linux/pm_runtime.h>
> +#include "internals.h"
> +#else
> +#include <spi.h>
> +#include <spi-mem.h>
> +#endif
> +
> +#ifndef __UBOOT__

I would like remove Linux stuff atleast on this file becuase it's
difficult for me to read or review the code and also driver/spi have
fully u-boot dm stuff. I know it's easy for Linux sync but for this we
can do manual sync what ever need. I'm on something what from Linux.