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 <plagnioj@jcrosoft.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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cb71941a68
Коммит
850a5b670a
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@ -0,0 +1,26 @@
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Atmel SPI device
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Required properties:
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- compatible : should be "atmel,at91rm9200-spi".
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- reg: Address and length of the register set for the device
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- interrupts: Should contain spi interrupt
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- cs-gpios: chipselects
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Example:
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spi1: spi@fffcc000 {
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compatible = "atmel,at91rm9200-spi";
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reg = <0xfffcc000 0x4000>;
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interrupts = <13 4 5>;
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#address-cells = <1>;
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#size-cells = <0>;
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cs-gpios = <&pioB 3 0>;
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status = "okay";
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mmc-slot@0 {
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compatible = "mmc-spi-slot";
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reg = <0>;
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gpios = <&pioC 4 0>; /* CD */
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spi-max-frequency = <25000000>;
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};
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};
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@ -20,6 +20,7 @@
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#include <linux/spi/spi.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/platform_data/atmel.h>
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#include <linux/platform_data/atmel.h>
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#include <linux/of.h>
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#include <asm/io.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <asm/gpio.h>
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@ -768,6 +769,10 @@ static int atmel_spi_setup(struct spi_device *spi)
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/* chipselect must have been muxed as GPIO (e.g. in board setup) */
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/* chipselect must have been muxed as GPIO (e.g. in board setup) */
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npcs_pin = (unsigned int)spi->controller_data;
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npcs_pin = (unsigned int)spi->controller_data;
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if (gpio_is_valid(spi->cs_gpio))
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npcs_pin = spi->cs_gpio;
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asd = spi->controller_state;
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asd = spi->controller_state;
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if (!asd) {
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if (!asd) {
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asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL);
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asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL);
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@ -937,8 +942,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
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/* the spi->mode bits understood by this driver: */
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/* the spi->mode bits understood by this driver: */
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master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
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master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
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master->dev.of_node = pdev->dev.of_node;
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master->bus_num = pdev->id;
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master->bus_num = pdev->id;
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master->num_chipselect = 4;
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master->num_chipselect = master->dev.of_node ? 0 : 4;
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master->setup = atmel_spi_setup;
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master->setup = atmel_spi_setup;
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master->transfer = atmel_spi_transfer;
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master->transfer = atmel_spi_transfer;
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master->cleanup = atmel_spi_cleanup;
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master->cleanup = atmel_spi_cleanup;
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@ -1064,11 +1070,20 @@ static int atmel_spi_resume(struct platform_device *pdev)
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#define atmel_spi_resume NULL
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#define atmel_spi_resume NULL
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#endif
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#endif
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#if defined(CONFIG_OF)
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static const struct of_device_id atmel_spi_dt_ids[] = {
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{ .compatible = "atmel,at91rm9200-spi" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
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#endif
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static struct platform_driver atmel_spi_driver = {
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static struct platform_driver atmel_spi_driver = {
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.driver = {
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.driver = {
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.name = "atmel_spi",
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.name = "atmel_spi",
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(atmel_spi_dt_ids),
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},
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},
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.suspend = atmel_spi_suspend,
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.suspend = atmel_spi_suspend,
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.resume = atmel_spi_resume,
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.resume = atmel_spi_resume,
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