From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 3/3] spi: psdev: add passive serial driver
Date: Thu, 13 Mar 2014 17:14:50 +0000
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To: Michael Grzeschik <m.grzeschik@pengutronix.de>
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On Wed, Mar 12, 2014 at 03:53:37PM +0000, Michael Grzeschik wrote:
> This patch introduces the psdev driver. It is used to communicate to an
> Altera passive serial connected FPGA by writing into an character
> device.
> 
> It simply initates the protocol on open and clocks the data into the
> FPGA by using the underlying SPI bus on write. The used SPI bus can also
> be an bitbang SPI bus. On close it will check for the response of the
> FPGA and tells if the write process was successful.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
> ---
>  drivers/spi/Kconfig    |   9 +
>  drivers/spi/Makefile   |   1 +
>  drivers/spi/spipsdev.c | 520 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 530 insertions(+)
>  create mode 100644 drivers/spi/spipsdev.c

[...]

> +static const struct of_device_id psdev_dt_ids[] = {
> +       { .compatible = "altr,passive-serial" },
> +       {},
> +};

There should be a binding document for this as part of the series.

Thanks,
Mark.