Hi Grygorii,
On 12/23/2015 12:25 PM, Grygorii Strashko wrote:
On 12/23/2015 10:35 AM, Uri Mashiach wrote:
Add DT support for the wl1271 SPI WiFi.
Add documentation file for the wl1271 SPI WiFi.
Signed-off-by: Uri Mashiach <uri.mashiach@xxxxxxxxxxxxxx>
Acked-by: Igor Grinberg <grinberg@xxxxxxxxxxxxxx>
---
.../bindings/net/wireless/ti,wlcore,spi.txt | 35 +++++++++++
drivers/net/wireless/ti/wlcore/spi.c | 67 +++++++++++++++++++---
2 files changed, 95 insertions(+), 7 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
diff --git a/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
new file mode 100644
index 0000000..a3e7eb7
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
@@ -0,0 +1,35 @@
+* 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
+- interrupts : Should contain interrupt line and trigger type
It's good to describe here number of IRQ lines your device have and IRQ types (edge/level)
+- interrupt-parent : Should be the phandle for the interrupt controller
interrupt-parent is not required (also interrupts-extended can be used)
+ that services interrupts for this device
+- vwlan-supply : Point the node of the regulator that controls the wl1271 chip WLAN_EN pin
Pls, use gpio if this is required just to toggle WLAN_EN pin.
[ti,] power-gpio or en-gpio
+
+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,just
+
+Examples:
+
+&spi1 {
+ wl1271@1 {
+ compatible = "ti,wl1271";
+
+ reg = <1>;
+ spi-max-frequency = <48000000>;
+ clock-xtal;
+ interrupt-parent = <&gpio3>;
+ interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
+ wifi-supply = <&wifi_fixed>;
+ };
+};
diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
index d3a4bcb..7281f5a 100644
--- a/drivers/net/wireless/ti/wlcore/spi.c
+++ b/drivers/net/wireless/ti/wlcore/spi.c
@@ -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 +358,54 @@ static struct wl1271_if_operations spi_ops = {
.set_block_size = NULL,
};
+#ifdef CONFIG_OF
+static const struct of_device_id wlcore_spi_of_match_table[] = {
+ { .compatible = "ti,wl1271" },
+ { }
+};
+
+/**
+ * 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 resource *res,
+ struct wl12xx_spi_glue *glue,
+ struct wlcore_platdev_data *pdev_data)
+{
+ struct device_node *dt_node = spi->dev.of_node;
+ int ret;
+
+ ret = of_irq_to_resource(dt_node, 0, &res[0]);
+ if (spi->irq != ret) {
+ dev_err(glue->dev, "can't get interrupt resource\n");
+ return -EINVAL;
+ }
SPI core will parse IRQ for you (see below)
The IRQ type should be stored in res[0].flags.
Is there an alternative to of_irq_to_resource() for getting the IRQ type?
+
+ 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;
+}
+#else /* CONFIG_OF */
+static int wlcore_probe_of(struct spi_device *spi, struct resource *res,
+ struct wl12xx_spi_glue *glue,
+ struct wlcore_platdev_data *pdev_data)
+{
+ return -ENODATA;
+}
+#endif /* CONFIG_OF */
+
static int wl1271_probe(struct spi_device *spi)
{
struct wl12xx_spi_glue *glue;
@@ -365,8 +414,7 @@ static int wl1271_probe(struct spi_device *spi)
int ret;
memset(&pdev_data, 0x00, sizeof(pdev_data));
-
- /* TODO: add DT parsing when needed */
+ memset(res, 0x00, sizeof(res));
pdev_data.if_ops = &spi_ops;
@@ -390,6 +438,13 @@ static int wl1271_probe(struct spi_device *spi)
return PTR_ERR(glue->reg);
}
+ ret = wlcore_probe_of(spi, &res[0], glue, &pdev_data);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(glue->dev,
+ "can't get device tree parameters (%d)\n", ret);
+ return ret;
So, wl1271_probe will fail always if CONFIG_OF=n. Right?
+ }
+
ret = spi_setup(spi);
if (ret < 0) {
dev_err(glue->dev, "spi_setup failed\n");
@@ -404,10 +459,6 @@ static int wl1271_probe(struct spi_device *spi)
glue->core->dev.parent = &spi->dev;
- memset(res, 0x00, sizeof(res));
-
- res[0].start = spi->irq;
- res[0].flags = IORESOURCE_IRQ;
res[0].name = "irq";
Above code might be left unchaenged.
ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
@@ -445,10 +496,12 @@ static int wl1271_remove(struct spi_device *spi)
return 0;
}
-
static struct spi_driver wl1271_spi_driver = {
.driver = {
.name = "wl1271_spi",
+#ifdef CONFIG_OF
+ .of_match_table = of_match_ptr(wlcore_spi_of_match_table),
+#endif /* CONFIG_OF */
These ifdefs are not needed - see of_match_ptr() definition
},
.probe = wl1271_probe,
--
Thanks,
Uri
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