[PATCH 0/3] wlcore/wl12xx: spi: add wifi support to cm-t335

[PATCH 0/3] wlcore/wl12xx: spi: add wifi support to cm-t335

[Uri Mashiach]

Add DT support for WLS1271 SPI driver.
Fix oops by adding a power callback.

Uri Mashiach (3):
  wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)
  wlcore/wl12xx: spi: add device tree support
  wlcore/wl12xx: spi: add wifi support to cm-t335

 .../bindings/net/wireless/ti,wlcore,spi.txt        |  35 +++++++
 arch/arm/boot/dts/am335x-cm-t335.dts               |  58 +++++++++++-
 drivers/net/wireless/ti/wlcore/spi.c               | 104 +++++++++++++++++++--
 3 files changed, 189 insertions(+), 8 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt

-- 
2.5.0

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[PATCH 1/3] wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)

[Uri Mashiach]

The power function uses a consumer regulator access to update the WiFi
enable GPIO value.

Fix the below Oops when trying to modprobe wlcore_spi.
The oops occurs because the wl1271_power_{off,on}()
function doesn't check the power() function pointer.

[   23.401447] Unable to handle kernel NULL pointer dereference at
virtual address 00000000
[   23.409954] pgd = c0004000
[   23.412922] [00000000] *pgd=00000000
[   23.416693] Internal error: Oops: 80000007 [#1] SMP ARM
[   23.422168] Modules linked in: wl12xx wlcore mac80211 cfg80211
musb_dsps musb_hdrc usbcore usb_common snd_soc_simple_card evdev joydev
omap_rng wlcore_spi snd_soc_tlv320aic23_i2c rng_core snd_soc_tlv320aic23
c_can_platform c_can can_dev snd_soc_davinci_mcasp snd_soc_edma
snd_soc_omap omap_wdt musb_am335x cpufreq_dt thermal_sys hwmon
[   23.453253] CPU: 0 PID: 36 Comm: kworker/0:2 Not tainted
4.2.0-00002-g951efee-dirty #233
[   23.461720] Hardware name: Generic AM33XX (Flattened Device Tree)
[   23.468123] Workqueue: events request_firmware_work_func
[   23.473690] task: de32efc0 ti: de4ee000 task.ti: de4ee000
[   23.479341] PC is at 0x0
[   23.482112] LR is at wl12xx_set_power_on+0x28/0x124 [wlcore]
[   23.488074] pc : [<00000000>]    lr : [<bf2581f0>]    psr: 60000013
[   23.488074] sp : de4efe50  ip : 00000002  fp : 00000000
[   23.500162] r10: de7cdd00  r9 : dc848800  r8 : bf27af00
[   23.505663] r7 : bf27a1a8  r6 : dcbd8a80  r5 : dce0e2e0  r4 :
dce0d2e0
[   23.512536] r3 : 00000000  r2 : 00000000  r1 : 00000001  r0 :
dc848810
[   23.519412] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
Segment kernel
[   23.527109] Control: 10c5387d  Table: 9cb78019  DAC: 00000015
[   23.533160] Process kworker/0:2 (pid: 36, stack limit = 0xde4ee218)
[   23.539760] Stack: (0xde4efe50 to 0xde4f0000)

[...]

[   23.665030] [<bf2581f0>] (wl12xx_set_power_on [wlcore]) from
[<bf25f7ac>] (wlcore_nvs_cb+0x118/0xa4c [wlcore])
[   23.675604] [<bf25f7ac>] (wlcore_nvs_cb [wlcore]) from [<c04387ec>]
(request_firmware_work_func+0x30/0x58)
[   23.685784] [<c04387ec>] (request_firmware_work_func) from
[<c0058e2c>] (process_one_work+0x1b4/0x4b4)
[   23.695591] [<c0058e2c>] (process_one_work) from [<c0059168>]
(worker_thread+0x3c/0x4a4)
[   23.704124] [<c0059168>] (worker_thread) from [<c005ee68>]
(kthread+0xd4/0xf0)
[   23.711747] [<c005ee68>] (kthread) from [<c000f598>]
(ret_from_fork+0x14/0x3c)
[   23.719357] Code: bad PC value
[   23.722760] ---[ end trace 981be8510db9b3a9 ]---

Fix this by adding a power() function implementation.

Signed-off-by: Uri Mashiach <uri.mashiach-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
---
 drivers/net/wireless/ti/wlcore/spi.c | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
index 44f059f..d3a4bcb 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/regulator/consumer.h>
 
 #include "wlcore.h"
 #include "wl12xx_80211.h"
@@ -81,6 +82,7 @@
 struct wl12xx_spi_glue {
 	struct device *dev;
 	struct platform_device *core;
+	struct regulator *reg; /* Power regulator */
 };
 
 static void wl12xx_spi_reset(struct device *child)
@@ -318,11 +320,40 @@ static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
 	return 0;
 }
 
+/**
+ * wl12xx_spi_set_power - power on/off the wl12xx unit
+ * @child: wl12xx device handle.
+ * @enable: true/false to power on/off the unit.
+ *
+ * use the WiFi enable regulator to enable/disable the WiFi unit.
+ */
+static int wl12xx_spi_set_power(struct device *child, bool enable)
+{
+	int ret = 0;
+	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
+
+	WARN_ON(!glue->reg);
+
+	/* Update regulator state */
+	if (enable) {
+		ret = regulator_enable(glue->reg);
+		if (ret)
+			dev_err(child, "Power enable failure\n");
+	} else {
+		ret =  regulator_disable(glue->reg);
+		if (ret)
+			dev_err(child, "Power disable failure\n");
+	}
+
+	return ret;
+}
+
 static struct wl1271_if_operations spi_ops = {
 	.read		= wl12xx_spi_raw_read,
 	.write		= wl12xx_spi_raw_write,
 	.reset		= wl12xx_spi_reset,
 	.init		= wl12xx_spi_init,
+	.power		= wl12xx_spi_set_power,
 	.set_block_size = NULL,
 };
 
@@ -353,6 +384,12 @@ static int wl1271_probe(struct spi_device *spi)
 	 * comes from the board-peripherals file */
 	spi->bits_per_word = 32;
 
+	glue->reg = devm_regulator_get(&spi->dev, "vwlan");
+	if (IS_ERR(glue->reg)) {
+		dev_err(glue->dev, "can't get regulator\n");
+		return PTR_ERR(glue->reg);
+	}
+
 	ret = spi_setup(spi);
 	if (ret < 0) {
 		dev_err(glue->dev, "spi_setup failed\n");
-- 
2.5.0

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[PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Uri Mashiach]

Add DT support for the wl1271 SPI WiFi.

Add documentation file for the wl1271 SPI WiFi.

Signed-off-by: Uri Mashiach <uri.mashiach-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
---
 .../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
+- interrupt-parent :    Should be the phandle for the interrupt controller
+                        that services interrupts for this device
+- vwlan-supply :        Point the node of the regulator that controls the wl1271 chip WLAN_EN pin
+
+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;
+		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;
+	}
+
+	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;
+	}
+
 	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";
 
 	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 */
 	},
 
 	.probe		= wl1271_probe,
-- 
2.5.0

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[PATCH 3/3] wlcore/wl12xx: spi: add wifi support to cm-t335

[Uri Mashiach]

Device tree modifications:
- Pinmux for SPI0 and WiFi GPIOs.
- SPI0 node with wlcore as a child node.

Cc: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Uri Mashiach <uri.mashiach-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
Acked-by: Igor Grinberg <grinberg-lB3UumIvzKrRNpEZXGUFxA@public.gmane.org>
---
Prerequisites:
This patch applies on Tony's omap-for-v4.5/dt branch.

 arch/arm/boot/dts/am335x-cm-t335.dts | 58 +++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/am335x-cm-t335.dts b/arch/arm/boot/dts/am335x-cm-t335.dts
index 42e9b66..41242a5 100644
--- a/arch/arm/boot/dts/am335x-cm-t335.dts
+++ b/arch/arm/boot/dts/am335x-cm-t335.dts
@@ -11,6 +11,7 @@
 /dts-v1/;
 
 #include "am33xx.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	model = "CompuLab CM-T335";
@@ -40,6 +41,15 @@
 		regulator-max-microvolt = <3300000>;
 	};
 
+	/* Regulator for WiFi */
+	vwlan_fixed: fixedregulator@2 {
+		compatible = "regulator-fixed";
+		regulator-name = "vwlan_fixed";
+		gpio = <&gpio0 20 GPIO_ACTIVE_HIGH>; /* gpio0_20 */
+		enable-active-high;
+		regulator-boot-off;
+	};
+
 	backlight {
 		compatible = "pwm-backlight";
 		pwms = <&ecap0 0 50000 0>;
@@ -50,7 +60,10 @@
 
 &am33xx_pinmux {
 	pinctrl-names = "default";
-	pinctrl-0 = <&bluetooth_pins>;
+	pinctrl-0 = <
+		  &bluetooth_pins
+		  &wifi_pins
+	>;
 
 	i2c0_pins: pinmux_i2c0_pins {
 		pinctrl-single,pins = <
@@ -223,6 +236,21 @@
 		>;
 	};
 
+	spi0_pins: pinmux_spi0_pins {
+		pinctrl-single,pins = <
+			/* spi0_sclk.spi0_sclk */
+			AM33XX_IOPAD(0x950, PIN_INPUT | MUX_MODE0)
+			/* spi0_d0.spi0_d0 */
+			AM33XX_IOPAD(0x954, PIN_OUTPUT_PULLUP | MUX_MODE0)
+			/* spi0_d1.spi0_d1 */
+			AM33XX_IOPAD(0x958, PIN_INPUT | MUX_MODE0)
+			/* spi0_cs0.spi0_cs0 */
+			AM33XX_IOPAD(0x95C, PIN_OUTPUT | MUX_MODE0)
+			/* spi0_cs1.spi0_cs1 */
+			AM33XX_IOPAD(0x960, PIN_OUTPUT | MUX_MODE0)
+		>;
+	};
+
 	/* wl1271 bluetooth */
 	bluetooth_pins: pinmux_bluetooth_pins {
 		pinctrl-single,pins = <
@@ -230,6 +258,16 @@
 			AM33XX_IOPAD(0x9b0, PIN_OUTPUT_PULLUP | MUX_MODE7)
 		>;
 	};
+
+	/* wl1271 WiFi */
+	wifi_pins: pinmux_wifi_pins {
+		pinctrl-single,pins = <
+			/* EMU1.gpio3_8 - WiFi IRQ */
+			AM33XX_IOPAD(0x9e8, PIN_INPUT_PULLUP | MUX_MODE7)
+			/* XDMA_EVENT_INTR1.gpio0_20 - WiFi enable */
+			AM33XX_IOPAD(0x9b4, PIN_OUTPUT | MUX_MODE7)
+		>;
+	};
 };
 
 &uart0 {
@@ -394,3 +432,21 @@ status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc1_pins>;
 };
+
+&spi0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_pins>;
+	ti,pindir-d0-out-d1-in = <1>;
+	/* WLS1271 WiFi */
+	wlcore: wlcore@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>;
+	};
+};
-- 
2.5.0

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Re: [PATCH 1/3] wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)

[Grygorii Strashko]

On 12/23/2015 10:35 AM, Uri Mashiach wrote:
> The power function uses a consumer regulator access to update the WiFi
> enable GPIO value.
> 
> Fix the below Oops when trying to modprobe wlcore_spi.
> The oops occurs because the wl1271_power_{off,on}()
> function doesn't check the power() function pointer.
> 
> [   23.401447] Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [   23.409954] pgd = c0004000
> [   23.412922] [00000000] *pgd=00000000
> [   23.416693] Internal error: Oops: 80000007 [#1] SMP ARM
> [   23.422168] Modules linked in: wl12xx wlcore mac80211 cfg80211
> musb_dsps musb_hdrc usbcore usb_common snd_soc_simple_card evdev joydev
> omap_rng wlcore_spi snd_soc_tlv320aic23_i2c rng_core snd_soc_tlv320aic23
> c_can_platform c_can can_dev snd_soc_davinci_mcasp snd_soc_edma
> snd_soc_omap omap_wdt musb_am335x cpufreq_dt thermal_sys hwmon
> [   23.453253] CPU: 0 PID: 36 Comm: kworker/0:2 Not tainted
> 4.2.0-00002-g951efee-dirty #233
> [   23.461720] Hardware name: Generic AM33XX (Flattened Device Tree)
> [   23.468123] Workqueue: events request_firmware_work_func
> [   23.473690] task: de32efc0 ti: de4ee000 task.ti: de4ee000
> [   23.479341] PC is at 0x0
> [   23.482112] LR is at wl12xx_set_power_on+0x28/0x124 [wlcore]

Why can't you just add proper check in wl1271_power_on/wl1271_power_off() instead?

-- 
regards,
-grygorii
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Re: [PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Grygorii Strashko]

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-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> ---
>   .../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)

> +
> +	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,
> 


-- 
regards,
-grygorii
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Re: [PATCH 1/3] wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)

[Uri Mashiach]

Hi Grygorii,

On 12/23/2015 12:08 PM, Grygorii Strashko wrote:
> On 12/23/2015 10:35 AM, Uri Mashiach wrote:
>> The power function uses a consumer regulator access to update the WiFi
>> enable GPIO value.
>>
>> Fix the below Oops when trying to modprobe wlcore_spi.
>> The oops occurs because the wl1271_power_{off,on}()
>> function doesn't check the power() function pointer.
>>
>> [   23.401447] Unable to handle kernel NULL pointer dereference at
>> virtual address 00000000
>> [   23.409954] pgd = c0004000
>> [   23.412922] [00000000] *pgd=00000000
>> [   23.416693] Internal error: Oops: 80000007 [#1] SMP ARM
>> [   23.422168] Modules linked in: wl12xx wlcore mac80211 cfg80211
>> musb_dsps musb_hdrc usbcore usb_common snd_soc_simple_card evdev joydev
>> omap_rng wlcore_spi snd_soc_tlv320aic23_i2c rng_core snd_soc_tlv320aic23
>> c_can_platform c_can can_dev snd_soc_davinci_mcasp snd_soc_edma
>> snd_soc_omap omap_wdt musb_am335x cpufreq_dt thermal_sys hwmon
>> [   23.453253] CPU: 0 PID: 36 Comm: kworker/0:2 Not tainted
>> 4.2.0-00002-g951efee-dirty #233
>> [   23.461720] Hardware name: Generic AM33XX (Flattened Device Tree)
>> [   23.468123] Workqueue: events request_firmware_work_func
>> [   23.473690] task: de32efc0 ti: de4ee000 task.ti: de4ee000
>> [   23.479341] PC is at 0x0
>> [   23.482112] LR is at wl12xx_set_power_on+0x28/0x124 [wlcore]
>
> Why can't you just add proper check in wl1271_power_on/wl1271_power_off() instead?
>

Will be done in v2.

Thanks,
Uri
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Re: [PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Uri Mashiach]

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-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
>> Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
>> ---
>>    .../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)
>

Maybe IRQ type should be provided by dts file 
(IRQ_TYPE_LEVEL_HIGH/IRQ_TYPE_EDGE_RISING...)
to enable support for additional controllers?

>> +- interrupt-parent :    Should be the phandle for the interrupt controller
> interrupt-parent is not required (also interrupts-extended can be used)
>

Will be done in v2.

>> +                        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
>
>

The controller's power might need toggling in some board implementation.
Maybe GPIO and regulator should be implemented?

>> +
>> +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)
>
>> +
>> +	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?
>
>

Is a support for CONFIG_OF=n needed?

>> +	}
>> +
>>    	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.
>
>

Will be done in v2.

>>
>>    	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,
>>
>
>

-- 
Regards,
Uri
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Re: [PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Tony Lindgren]

* Uri Mashiach <uri.mashiach-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org> [151223 06:38]:
> On 12/23/2015 12:25 PM, Grygorii Strashko wrote:
> 
> >>+                        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
> >
> >
> 
> The controller's power might need toggling in some board implementation.
> Maybe GPIO and regulator should be implemented?

Yes a regulator for wlcore is best here because to properly control it
and the wait needed.

Regards,

Tony
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Re: [PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Uri Mashiach]

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-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
>> Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
>> ---
>>    .../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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Re: [PATCH 2/3] wlcore/wl12xx: spi: add device tree support

[Rob Herring]

On Wed, Dec 23, 2015 at 10:35:43AM +0200, 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-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> ---
>  .../bindings/net/wireless/ti,wlcore,spi.txt        | 35 +++++++++++

For the binding:

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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