Re: [PATCH v2] spi: orion: support armada extended baud rates

[Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>]

Hi Greg,

On Thu, Sep 4, 2014 at 2:54 PM,  <gerg-JBU5SbJe1FlAfugRpC6u6w@public.gmane.org> wrote:
> The Armada SoC family implementation of this SPI hardware module has
> extended the configuration register to allow for a wider range of SPI
> clock rates. Specifically the Serial Baud Rate Pre-selection bits in the
> SPI Interface Configuration Register now also use bits 6 and 7 as well.
>
> Modify the baud rate calculation to handle these differences for the
> Armada case. Potentially a baud rate can be setup using a number of
> different pre-scalar and scalar combinations. This code tries all
> possible pre-scalar divisors (8 in total) to try and find the most
> accuate set.

Are the Orion rates and register bits a subset of the Armada ones?
I.e. does the Armada work with the Orion setup?

> This change introduces a new device tree compatible device name
> "armada-spi". This is used in place of "orion-spi" on the Armada SoC
> parts.

> -                               compatible = "marvell,orion-spi";
> +                               compatible = "marvell,armada-spi";

If the answer to my above question is yes, you want to keep
"marvell,orion-spi" as a fallback.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

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