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spi/pl022: Add chip select handling via GPIO

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This patch adds the ability for the driver to control the chip select directly.
This enables independence from cs_control callbacks.  Configurable via
platform_data, to be extended as DT in the following patch.

Based on the initial patch by Alexandre Pereira da Silva <aletes.xgr@gmail.com>

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Roland Stigge 2012-08-22 15:49:17 +02:00 • committed by Mark Brown
parent 3ce8859e2e
commit f6f46de106
2 changed files with 36 additions and 14 deletions
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2
include/linux/amba/pl022.h
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@ -244,6 +244,7 @@ struct dma_chan;
* indicates no delay and the device will be suspended immediately.
* @rt: indicates the controller should run the message pump with realtime
* priority to minimise the transfer latency on the bus.
* @chipselects: list of <num_chipselects> chip select gpios
*/
struct pl022_ssp_controller {
u16 bus_id;
@ -254,6 +255,7 @@ struct pl022_ssp_controller {
void *dma_tx_param;
int autosuspend_delay;
bool rt;
int *chipselects;
};
/**