linux-kernel - Re: [PATCH v4 4/6] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

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Date: Wed, 19 Jun 2024 13:20:22 -0500
From: David Lechner <dlechner@...libre.com>
To: Marcelo Schmitt <marcelo.schmitt1@...il.com>
Cc: Marcelo Schmitt <marcelo.schmitt@...log.com>, broonie@...nel.org,
 lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 nuno.sa@...log.com, linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/6] spi: spi-axi-spi-engine: Add support for MOSI idle
 configuration

On 6/19/24 12:27 PM, Marcelo Schmitt wrote:
> On 06/19, David Lechner wrote:
>> On 6/18/24 6:11 PM, Marcelo Schmitt wrote:



>>> @@ -646,6 +651,9 @@ static int spi_engine_probe(struct platform_device *pdev)
>>>  
>>>  	host->dev.of_node = pdev->dev.of_node;
>>>  	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE;
>>> +	if (ADI_AXI_PCORE_VER_MAJOR(version) >= 1 &&
>>
>> Currently, the major version is required to be 1, so this check is not
>> strictly needed.
>>
> This is expecting the MOSI idle feature to be available on all versions from 1.3 on.
> Will SPI-Engine always be major version 1?

<yoda voice>Difficult to see, the future is.</yoda voice>

It's fine if you want to leave it the way it is.

> 
>>> +	    ADI_AXI_PCORE_VER_MINOR(version) >= 3)
>>> +		host->mode_bits |=  SPI_MOSI_IDLE_LOW | SPI_MOSI_IDLE_HIGH;
>>