From 850a5b670af6293fcb1852af57567d19150ff638 Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Fri, 23 Nov 2012 13:44:39 +0100 Subject: spi/atmel: add DT support Use the newly introduce cs-gpios dt support on atmel. We do not use the hardware cs as it's wired and has bugs and limitations. As the controller believes that only active-low devices/systems exists. Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Acked-by: Nicolas Ferre Signed-off-by: Grant Likely --- drivers/spi/spi-atmel.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 75c0c4f..ab34497 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -768,6 +769,10 @@ static int atmel_spi_setup(struct spi_device *spi) /* chipselect must have been muxed as GPIO (e.g. in board setup) */ npcs_pin = (unsigned int)spi->controller_data; + + if (gpio_is_valid(spi->cs_gpio)) + npcs_pin = spi->cs_gpio; + asd = spi->controller_state; if (!asd) { asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL); @@ -937,8 +942,9 @@ static int atmel_spi_probe(struct platform_device *pdev) /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->dev.of_node = pdev->dev.of_node; master->bus_num = pdev->id; - master->num_chipselect = 4; + master->num_chipselect = master->dev.of_node ? 0 : 4; master->setup = atmel_spi_setup; master->transfer = atmel_spi_transfer; master->cleanup = atmel_spi_cleanup; @@ -1064,11 +1070,20 @@ static int atmel_spi_resume(struct platform_device *pdev) #define atmel_spi_resume NULL #endif +#if defined(CONFIG_OF) +static const struct of_device_id atmel_spi_dt_ids[] = { + { .compatible = "atmel,at91rm9200-spi" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids); +#endif static struct platform_driver atmel_spi_driver = { .driver = { .name = "atmel_spi", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(atmel_spi_dt_ids), }, .suspend = atmel_spi_suspend, .resume = atmel_spi_resume, -- cgit v1.1