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Commit 850a5b67 authored by Jean-Christophe PLAGNIOL-VILLARD's avatar Jean-Christophe PLAGNIOL-VILLARD Committed by Grant Likely
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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: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent cb71941a

Documentation/devicetree/bindings/spi/spi_atmel.txt

0 → 100644
+26 −0
Original line number Diff line number Diff line 
Atmel SPI device



Required properties:

- compatible : should be "atmel,at91rm9200-spi".

- reg: Address and length of the register set for the device

- interrupts: Should contain spi interrupt

- cs-gpios: chipselects



Example:



spi1: spi@fffcc000 {

	compatible = "atmel,at91rm9200-spi";

	reg = <0xfffcc000 0x4000>;

	interrupts = <13 4 5>;

	#address-cells = <1>;

	#size-cells = <0>;

	cs-gpios = <&pioB 3 0>;

	status = "okay";



	mmc-slot@0 {

		compatible = "mmc-spi-slot";

		reg = <0>;

		gpios = <&pioC 4 0>;	/* CD */

		spi-max-frequency = <25000000>;

	};

};

drivers/spi/spi-atmel.c

+16 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/spi/spi.h>

#include <linux/slab.h>

#include <linux/platform_data/atmel.h>

#include <linux/of.h>



#include <asm/io.h>

#include <asm/gpio.h>
@@ -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,