linux-kernel - Re: [PATCH 0/3] fpga: xilinx-selectmap: add new driver

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Date: Fri, 2 Feb 2024 15:53:47 -0500 (EST)
From: Charles Perry <charles.perry@...oirfairelinux.com>
To: Rob Herring <robh@...nel.org>
Cc: mdf <mdf@...nel.org>, Allen VANDIVER <avandiver@...kem-imaje.com>, 
	Brian CODY <bcody@...kem-imaje.com>, hao wu <hao.wu@...el.com>, 
	yilun xu <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>, 
	krzysztof kozlowski+dt <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, 
	Michal Simek <michal.simek@....com>, 
	linux-fpga <linux-fpga@...r.kernel.org>, 
	devicetree <devicetree@...r.kernel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/3] fpga: xilinx-selectmap: add new driver

On Feb 2, 2024, at 3:16 PM, Rob Herring robh@...nel.org wrote:
> On Wed, Jan 31, 2024 at 06:05:30PM -0500, Charles Perry wrote:
>> Hello,
>> 
>> This patchset adds a new driver for the 7 series FPGA's SelectMAP
>> interface.
>> 
>> The SelectMAP interface shares a common GPIO protocol with the SPI
>> interface which is already in the kernel (drivers/fpga/xilinx-spi.c).
>> The approach proposed in this patchset is to refactor xilinx-spi.c into
>> xilinx-core.c which would handle the common GPIO protocol. This is then
>> used to build two drivers, the already existing xilinx-spi.c driver and
>> a newly added xilinx-selectmap.c driver.
>> 
>> The SelectMAP driver proposed only supports 8 bit mode. This is because
>> the 16 and 32 bits mode have limitations with regards to compressed
>> bitstream support as well as introducing endianness considerations.
>> 
>> I'm testing xilinx-selectmap.c on a custom i.MX6 board connected to an
>> Artix 7 FPGA. Flashing a 913K bitstream takes 0.44 seconds.
>> 
>> v2: From Krzysztof Kozlowski review's:
>>   * Use more conventional names for gpio DT bindings
>>   * fix example in DT bindings
>>   * add mc-peripheral-props.yaml to DT bindings
>>   * fix various formatting mistakes
>>   * Remove all occurences of the "slave" word.
> 
> Please label the series with the version number and don't send new
> versions as replies to the previous version.
> 
> Rob

Ok, will do.

Regards,
Charles