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wlcore/wl12xx: spi: add device tree support 

Add DT support for the wl1271 SPI WiFi.

Add documentation file for the wl1271 SPI WiFi.

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Acked-by: Rob Herring <robh@kernel.org>
Tested-By: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Uri Mashiach 2015-12-30 15:35:32 +02:00 committed by Kalle Valo
parent 4c1ce07bcf
commit 04654c3861
3 changed files with 80 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt Normal file
View File

@ -0,0 +1,36 @@
* Texas Instruments wl1271 wireless lan controller
The wl1271 chip can be connected via SPI or via SDIO. This
document describes the binding for the SPI connected chip.
Required properties:
- compatible : Should be "ti,wl1271"
- reg : Chip select address of device
- spi-max-frequency : Maximum SPI clocking speed of device in Hz
- ref-clock-frequency : Reference clock frequency
- interrupt-parent, interrupts :
Should contain parameters for 1 interrupt line.
Interrupt parameters: parent, line number, type.
- vwlan-supply : Point the node of the regulator that powers/enable the wl1271 chip
Optional properties:
- clock-xtal : boolean, clock is generated from XTAL
- Please consult Documentation/devicetree/bindings/spi/spi-bus.txt
for optional SPI connection related properties,
Examples:
&spi1 {
wl1271@1 {
compatible = "ti,wl1271";
reg = <1>;
spi-max-frequency = <48000000>;
clock-xtal;
ref-clock-frequency = <38400000>;
interrupt-parent = <&gpio3>;
interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
vwlan-supply = <&vwlan_fixed>;
};
};

2
drivers/net/wireless/ti/wlcore/Kconfig
View File

@ -13,7 +13,7 @@ config WLCORE
config WLCORE_SPI
tristate "TI wlcore SPI support"
depends on WLCORE && SPI_MASTER
depends on WLCORE && SPI_MASTER && OF
select CRC7
---help---
This module adds support for the SPI interface of adapters using

47
drivers/net/wireless/ti/wlcore/spi.c
View File

@ -30,6 +30,7 @@
#include <linux/spi/spi.h>
#include <linux/wl12xx.h>
#include <linux/platform_device.h>
#include <linux/of_irq.h>
#include <linux/regulator/consumer.h>
#include "wlcore.h"
@ -357,6 +358,39 @@ static struct wl1271_if_operations spi_ops = {
.set_block_size = NULL,
};
static const struct of_device_id wlcore_spi_of_match_table[] = {
{ .compatible = "ti,wl1271" },
{ }
};
MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);
/**
* wlcore_probe_of - DT node parsing.
* @spi: SPI slave device parameters.
* @res: resource parameters.
* @glue: wl12xx SPI bus to slave device glue parameters.
* @pdev_data: wlcore device parameters
*/
static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue,
struct wlcore_platdev_data *pdev_data)
{
struct device_node *dt_node = spi->dev.of_node;
int ret;
if (of_find_property(dt_node, "clock-xtal", NULL))
pdev_data->ref_clock_xtal = true;
ret = of_property_read_u32(dt_node, "ref-clock-frequency",
&pdev_data->ref_clock_freq);
if (IS_ERR_VALUE(ret)) {
dev_err(glue->dev,
"can't get reference clock frequency (%d)\n", ret);
return ret;
}
return 0;
}
static int wl1271_probe(struct spi_device *spi)
{
struct wl12xx_spi_glue *glue;
@ -366,8 +400,6 @@ static int wl1271_probe(struct spi_device *spi)
memset(&pdev_data, 0x00, sizeof(pdev_data));
/* TODO: add DT parsing when needed */
pdev_data.if_ops = &spi_ops;
glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
@ -392,6 +424,13 @@ static int wl1271_probe(struct spi_device *spi)
return PTR_ERR(glue->reg);
}
ret = wlcore_probe_of(spi, glue, &pdev_data);
if (IS_ERR_VALUE(ret)) {
dev_err(glue->dev,
"can't get device tree parameters (%d)\n", ret);
return ret;
}
ret = spi_setup(spi);
if (ret < 0) {
dev_err(glue->dev, "spi_setup failed\n");
@ -409,7 +448,7 @@ static int wl1271_probe(struct spi_device *spi)
memset(res, 0x00, sizeof(res));
res[0].start = spi->irq;
res[0].flags = IORESOURCE_IRQ;
res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq);
res[0].name = "irq";
ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
@ -447,10 +486,10 @@ static int wl1271_remove(struct spi_device *spi)
return 0;
}
static struct spi_driver wl1271_spi_driver = {
.driver = {
.name = "wl1271_spi",
.of_match_table = of_match_ptr(wlcore_spi_of_match_table),
},
.probe = wl1271_probe,