linux-kernel - Re: [PATCH v4 08/12] gpio: add ti-ssp gpio driver

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Date:	Wed, 3 Nov 2010 17:24:09 +0100
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	David Brownell <david-b@...bell.net>
Cc:	davinci-linux-open-source@...ux.davincidsp.com,
	broonie@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	rpurdie@...ys.net, Cyril Chemparathy <cyril@...com>,
	spi-devel-general@...ts.sourceforge.net,
	linux-arm-kernel@...ts.infradead.org, lrg@...mlogic.co.uk
Subject: Re: [PATCH v4 08/12] gpio: add ti-ssp gpio driver

2010/11/3 David Brownell <david-b@...bell.net>:
> --- On Wed, 11/3/10, Linus Walleij <linus.ml.walleij@...il.com> wrote:
>>
>> Incidentally the ARM PrimeCell PL022 is called SSP,
>> "Synchronous Serial Port" and is not multifunction at all.
>
> ISTR coming across that IP module; are you sure
> that it only supports a single serial protocol,
> instead of just a "small" variety" (multi)?
> Unless the hardware only supports one protocol,
> my point holds.

Yeah well:

/**
 * enum ssp_interface - interfaces allowed for this SSP Controller
 * @SSP_INTERFACE_MOTOROLA_SPI: Motorola Interface
 * @SSP_INTERFACE_TI_SYNC_SERIAL: Texas Instrument Synchronous Serial
 * interface
 * @SSP_INTERFACE_NATIONAL_MICROWIRE: National Semiconductor Microwire
 * interface
 * @SSP_INTERFACE_UNIDIRECTIONAL: Unidirectional interface (STn8810
 * &STn8815 only)
 */
enum ssp_interface {
        SSP_INTERFACE_MOTOROLA_SPI,
        SSP_INTERFACE_TI_SYNC_SERIAL,
        SSP_INTERFACE_NATIONAL_MICROWIRE,
        SSP_INTERFACE_UNIDIRECTIONAL
};

If that is what you mean then yes. All of the protols are
"SPI type" though.

Yours,
Linus Walleij
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