[PATCH] ARM: dts: omap4-droid4: add bluetooth

[PATCH] ARM: dts: omap4-droid4: add bluetooth

[Sebastian Reichel]

Droid 4 has wl1835 connected to the OMAP's UART4 port, which is
used for Bluetooth and most likely can also be used for controlling
the FM radio and GPS receivers.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
Hi,

Thanks to the work of Rob adding Bluetooth support for Droid 4 was
straight forward :) I did a short test scanning for available devices
using bluetoothctl. For that I had to rebind the bluetooth device,
since it has been initialized before rootfs/firmware was available
(builtin driver):

echo serial0-0 > /sys/bus/serial/drivers/hci-ti/unbind
echo serial0-0 > /sys/bus/serial/drivers/hci-ti/bind

According to my research the FM module should be functional on
Droid 4 and the wl1835's GPS is also used. Rob, do you have a
plans for supporting the extra resources?

-- Sebastian
---
 arch/arm/boot/dts/omap4-droid4-xt894.dts | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts
index e0fdfe6cc78c..2495faf79a43 100644
--- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
+++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
@@ -395,6 +395,15 @@
 		>;
 	};
 
+	uart4_pins: pinmux_uart4_pins {
+		pinctrl-single,pins = <
+		OMAP4_IOPAD(0x15c, PIN_INPUT | MUX_MODE0)		/* uart4_rx */
+		OMAP4_IOPAD(0x15e, PIN_OUTPUT | MUX_MODE0)		/* uart4_tx */
+		OMAP4_IOPAD(0x110, PIN_INPUT_PULLUP | MUX_MODE5)	/* uart4_cts */
+		OMAP4_IOPAD(0x112, PIN_OUTPUT_PULLUP | MUX_MODE5)	/* uart4_rts */
+		>;
+	};
+
 	mcbsp2_pins: pinmux_mcbsp2_pins {
 		pinctrl-single,pins = <
 			OMAP4_IOPAD(0x0f6, PIN_INPUT | MUX_MODE0)	/* abe_mcbsp2_clkx */
@@ -429,6 +438,17 @@
 			       &omap4_pmx_core 0x17c>;
 };
 
+&uart4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart4_pins>;
+
+	bluetooth {
+		compatible = "ti,wl1835-st";
+		enable-gpios = <&gpio6 14 GPIO_ACTIVE_HIGH>; /* gpio 174 */
+		max-speed = <3686400>;
+	};
+};
+
 &usbhsehci {
 	phys = <&hsusb1_phy>;
 };
-- 
2.11.0

Re: [PATCH] ARM: dts: omap4-droid4: add bluetooth

[Rob Herring]

On Sat, Apr 15, 2017 at 5:18 PM, Sebastian Reichel <sre@kernel.org> wrote:
> Droid 4 has wl1835 connected to the OMAP's UART4 port, which is
> used for Bluetooth and most likely can also be used for controlling
> the FM radio and GPS receivers.
>
> Signed-off-by: Sebastian Reichel <sre@kernel.org>
> ---
> Hi,
>
> Thanks to the work of Rob adding Bluetooth support for Droid 4 was
> straight forward :) I did a short test scanning for available devices
> using bluetoothctl. For that I had to rebind the bluetooth device,
> since it has been initialized before rootfs/firmware was available
> (builtin driver):
>
> echo serial0-0 > /sys/bus/serial/drivers/hci-ti/unbind
> echo serial0-0 > /sys/bus/serial/drivers/hci-ti/bind
>
> According to my research the FM module should be functional on
> Droid 4 and the wl1835's GPS is also used. Rob, do you have a
> plans for supporting the extra resources?

I don't think the h/w I have can do FM or GPS. At least there's no
headphone jack to serve as the FM antenna. For GPS, it seems support
for that is not publicly available. Maybe an antenna is not needed to
get the control interface working. It would be nice to integrate
though and then we can kill off the shared transport driver. Marcel
had mentioned that the Intel BT driver provides a regmap interface to
its FM driver. Not sure if that would work for TI.

Rob

Re: [PATCH] ARM: dts: omap4-droid4: add bluetooth

[Sebastian Reichel]

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Hi Michael,

On Sat, Apr 15, 2017 at 07:00:29PM -0700, Michael Scott wrote:
> On Apr 15, 2017 3:18 PM, "Sebastian Reichel" <sre@kernel.org> wrote:
>> Droid 4 has wl1835 connected to the OMAP's UART4 port, which is
> 
> Technically, I believe the Droid 4 has WL1283 WLAN chip.
>
> - Mike

iFixit [0] has a nice photo in step 15, which clearly shows,
that its a WL1285C, with 1835 looking similar I didn't notice
Rob's binding does not cover wl128x. I will resend with proper
compatible value (+ patches for the driver and binding).

[0] https://www.ifixit.com/Teardown/Motorola+Droid+4+Teardown/7759#s31961

-- Sebastian

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Re: [PATCH] ARM: dts: omap4-droid4: add bluetooth

[Rob Herring]

On Sun, Apr 16, 2017 at 10:26 AM, Sebastian Reichel <sre@kernel.org> wrote:
> Hi Michael,
>
> On Sat, Apr 15, 2017 at 07:00:29PM -0700, Michael Scott wrote:
>> On Apr 15, 2017 3:18 PM, "Sebastian Reichel" <sre@kernel.org> wrote:
>>> Droid 4 has wl1835 connected to the OMAP's UART4 port, which is
>>
>> Technically, I believe the Droid 4 has WL1283 WLAN chip.
>>
>> - Mike
>
> iFixit [0] has a nice photo in step 15, which clearly shows,
> that its a WL1285C, with 1835 looking similar I didn't notice
> Rob's binding does not cover wl128x. I will resend with proper
> compatible value (+ patches for the driver and binding).

I only documented what was publicly available as some parts have
failed to materialize. Any idea what the differences are?

Rob

Re: [PATCH] ARM: dts: omap4-droid4: add bluetooth

[Tony Lindgren]

* Sebastian Reichel <sre@kernel.org> [170415 15:21]:
> Droid 4 has wl1835 connected to the OMAP's UART4 port, which is
> used for Bluetooth and most likely can also be used for controlling
> the FM radio and GPS receivers.
...

> --- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
> +++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
> @@ -395,6 +395,15 @@
>  		>;
>  	};
>  
> +	uart4_pins: pinmux_uart4_pins {
> +		pinctrl-single,pins = <
> +		OMAP4_IOPAD(0x15c, PIN_INPUT | MUX_MODE0)		/* uart4_rx */
> +		OMAP4_IOPAD(0x15e, PIN_OUTPUT | MUX_MODE0)		/* uart4_tx */
> +		OMAP4_IOPAD(0x110, PIN_INPUT_PULLUP | MUX_MODE5)	/* uart4_cts */
> +		OMAP4_IOPAD(0x112, PIN_OUTPUT_PULLUP | MUX_MODE5)	/* uart4_rts */
> +		>;
> +	};
> +
>  	mcbsp2_pins: pinmux_mcbsp2_pins {
>  		pinctrl-single,pins = <
>  			OMAP4_IOPAD(0x0f6, PIN_INPUT | MUX_MODE0)	/* abe_mcbsp2_clkx */

This needs updating against v4.12-rc1 BTW, looks like you have
some audio patches in works here that mainline does not have
for mcbsp2.

Regards,

Tony