From: Pratyush Yadav <p.yadav@ti.com>
To: Parshuram Thombare <pthombar@cadence.com>
Cc: <broonie@kernel.org>, <lukas@wunner.de>, <robh+dt@kernel.org>,
<linux-spi@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <jpawar@cadence.com>,
<mparab@cadence.com>, Konrad Kociolek <konrad@cadence.com>
Subject: Re: [PATCH v4 2/2] spi: cadence: add support for Cadence XSPI controller
Date: Fri, 17 Sep 2021 15:50:47 +0530 [thread overview]
Message-ID: <20210917102045.mapb7j3sixzxwald@ti.com> (raw)
In-Reply-To: <1631534779-8371-1-git-send-email-pthombar@cadence.com>
On 13/09/21 02:06PM, Parshuram Thombare wrote:
> This patch adds driver 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.
Acked-by: Pratyush Yadav <p.yadav@ti.com>
--
Regards,
Pratyush Yadav
Texas Instruments Inc.
prev parent reply other threads:[~2021-09-17 10:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 12:02 [PATCH v4 0/2] add support for Cadence's XSPI controller Parshuram Thombare
2021-09-13 12:04 ` [PATCH v4 1/2] spi: cadence: add dt-bindings documentation for Cadence " Parshuram Thombare
2021-09-17 0:52 ` Rob Herring
2021-09-13 12:06 ` [PATCH v4 2/2] spi: cadence: add support " Parshuram Thombare
2021-09-17 10:20 ` Pratyush Yadav [this message]
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