linux-kernel - Re: [PATCH v2] spi: Add FSI-attached SPI controller driver

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Date:   Tue, 4 Feb 2020 13:05:28 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>
Subject: Re: [PATCH v2] spi: Add FSI-attached SPI controller driver

On Tue, Feb 4, 2020 at 12:30 AM Eddie James <eajames@...ux.ibm.com> wrote:
>
> There exists a set of SPI controllers on some POWER processors that may
> be accessed through the FSI bus. Add a driver to traverse the FSI CFAM
> engine that can access and drive the SPI controllers. This driver would
> typically be used by a baseboard management controller (BMC).
>
> The SPI controllers operate by means of programming a sequencing engine
> which automatically manages the usual SPI protocol buses. The driver
> programs each transfer into the sequencer as various operations
> specifying the slave chip and shifting data in and out on the lines.

Some comments left unsettled in v1, thus applicable here.

-- 
With Best Regards,
Andy Shevchenko