[U-Boot] [PATCH V2 3/9] spi: mxc: fix sf probe when using mxc_spi

[Marek Vasut]

On Thursday, August 07, 2014 at 03:05:30 PM, Nikita Kiryanov wrote:
> MXC SPI driver has a feature whereas a GPIO line can be used to force CS
> high across multiple transactions. This is set up by embedding the GPIO
> information in the CS value:
> 
> cs = (cs | gpio << 8)
> 
> This merge of cs and gpio data into one value breaks the sf probe command:
> if the use of gpio is required, invoking "sf probe <cs>" will not work,
> because the CS argument doesn't have the GPIO information in it. Instead,
> the user must use "sf probe <cs | gpio << 8>". For example, if bank 2 gpio
> 30 is used to force cs high on cs 0, bus 0, then instead of typing "sf
> probe 0" the user now must type "sf probe 15872".
> 
> This is inconsistent with the description of the sf probe command, and
> forces the user to be aware of implementaiton details.
> 
> Fix this by introducing a new board function: board_spi_cs_gpio(), which
> will accept a naked CS value, and provide the driver with the relevant
> GPIO, if one is necessary.
> 
> Cc: Jagannadha Sutradharudu Teki <jagannadh.teki at gmail.com>
> Cc: Eric Nelson <eric.nelson at boundarydevices.com>
> Cc: Eric Benard <eric at eukrea.com>
> Cc: Fabio Estevam <fabio.estevam at freescale.com>
> Cc: Tim Harvey <tharvey at gateworks.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: Tom Rini <trini at ti.com>

Let's go with this:

Reviewed-by: Marek Vasut <marex at denx.de>

[...]
Best regards,
Marek Vasut