linux-kernel - RE: [PATCH v6 0/2] add support for Cadence's XSPI controller

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Date:   Sun, 19 Sep 2021 07:42:12 +0000
From:   Parshuram Raju Thombare <pthombar@...ence.com>
To:     Parshuram Raju Thombare <pthombar@...ence.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "lukas@...ner.de" <lukas@...ner.de>,
        "p.yadav@...com" <p.yadav@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Milind Parab <mparab@...ence.com>
Subject: RE: [PATCH v6 0/2] add support for Cadence's XSPI controller

Please ignore this patch series.

Regards,
Parshuram Thombare

>-----Original Message-----
>From: Parshuram Thombare <pthombar@...ence.com>
>Sent: Sunday, September 19, 2021 1:09 PM
>To: broonie@...nel.org; lukas@...ner.de; p.yadav@...com;
>robh+dt@...nel.org
>Cc: linux-spi@...r.kernel.org; devicetree@...r.kernel.org; linux-
>kernel@...r.kernel.org; Jayshri Dajiram Pawar <jpawar@...ence.com>; Milind
>Parab <mparab@...ence.com>; Parshuram Raju Thombare
><pthombar@...ence.com>
>Subject: [PATCH v6 0/2] add support for Cadence's XSPI controller
>
>This patch series adds support for Cadence's XSPI controller.
>It supports 3 work modes.
>1. ACMD (auto command) work mode
>    ACMD name is because it uses auto command engine in the controller.
>    It further has 2 modes PIO and CDMA (command DMA).
>    The CDMA work mode is dedicated for high-performance application
>    where very low software overhead is required. In this mode the
>    Command Engine is programmed by the series of linked descriptors
>    stored in system memory. These descriptors provide commands to execute
>    and store status information for finished commands.
>    The PIO mode work mode is dedicated for single operation where
>    constructing a linked list of descriptors would require too
>    much effort.
>2. STIG (Software Triggered Instruction Generator) work mode
>    In STIG mode, controller sends low-level instructions to memory.
>    Each instruction is 128-bit width. There is special instruction
>    DataSequence which carries information about data phase.
>    Driver uses Slave DMA interface to transfer data as only this
>    interface can be used in STIG work mode.
>3. Direct work mode
>    This work mode allows sending data without invoking any command through
>    the slave interface.
>Currently only STIG work mode is enabled, remaining work modes will
>be added later.
>
>Changes since v5:
>1. Added adjust_op_size to adjust op size according to sdma size.
>
>Changes since v4:
>1. Changed reg region names and lengths as suggested by Rob.
>
>Changes since v3:
>1. Removed ACMD PIO mode.
>2. Return IRQ_HANDLED only for handled interrupts.
>3. DT binding changes.
>
>Changes since v2:
>1. Removed extra lock around exec_op.
>2. Removed PHY parameters setting from the driver, those will be
>   handled by bootstrap pins available in the controller.
>
>Changes since v1:
>1. Use ACMD PIO work mode for NOR read, program and erase operations,
>   for everything else use STIG(Software Triggered Instruction
>   Generator) work mode.
>2. Changes suggested by Lukas.
>
>Parshuram Thombare (2):
>  spi: cadence: add dt-bindings documentation for Cadence XSPI
>    controller
>  spi: cadence: add support for Cadence XSPI controller
>
> .../devicetree/bindings/spi/cdns,xspi.yaml         |  77 +++
> drivers/spi/Kconfig                                |  12 +
> drivers/spi/Makefile                               |   1 +
> drivers/spi/spi-cadence-xspi.c                     | 639 +++++++++++++++++++++
> 4 files changed, 729 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> create mode 100644 drivers/spi/spi-cadence-xspi.c
>
>--
>2.7.4