From: David Summers <beagleboard@davidjohnsummers.uk>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-bluetooth@vger.kernel.org, devicetree <devicetree@vger.kernel.org>
Subject: Re: [PATCH v4 2/2] dt-bindings: Create the file for Realtek Bluetooth serial devices
Date: Fri, 25 Jan 2019 19:03:08 +0000 [thread overview]
Message-ID: <1fee0e05-5b41-ab24-8fe7-0f8c58479f19@davidjohnsummers.uk> (raw)
In-Reply-To: <CAGb2v64j=hGFhb3GVocRo9B1uY+tFBjbrm6F71L4ejA+cruUvA@mail.gmail.com>
Hi Chen-Yu,
Thanks for the interest, and sorry for the slow reply - I've been away
on business.
The latter was why my patches were so terse. I'd done v3 at the weekend:
https://www.spinics.net/lists/linux-bluetooth/msg78694.html
But Rob and Marcel wanted minor changes:
https://www.spinics.net/lists/linux-bluetooth/msg78706.html
https://www.spinics.net/lists/linux-bluetooth/msg78713.html
Now as I was going away, I quickly made the changes requested, and
posted night before I left.
Your questions are good, but without a clear answer. What I will say is
that
* the device drive hci_h5 is a bluetooth hci 3 wire driver
* I take this to be GND,RX,TX
* I also assume this means BCSP
* BCSP is either 3 wire or 5 wire
* The device tree hooks I took from
https://github.com/TinkerBoard/debian_kernel/commit/6a3128ade33f758887048578ada61a4b7ab8e678
* a patch direct from ASUS, and so I take it this is how the board is
wired up.
* If you look at the datasheet:
http://files.pine64.org/doc/datasheet/pine64/RTL8723BS.pdf
* You can see as well and RX and TX on pin 42,42 there is a UART_CTS
on 44, BT_WAKE on 6, BT_HOST_WAKE
* So I'm guessing these are wired up as described in the asus device tree
Now my problem is I don't have a board, I'm trying to mainline this your
Arm Arch users.
So really this asks the question as to if the hci_h5 is the correct
driver for the RTL8723BS; I think hci_h5 is intended just for 3 wire -
so probably can't get changes there. Does make you wonder if there
should be a more general driver?
Anyway, I'm not expert here. Really just want to get this chip supported
in the device tree. So I just did the minimal to load the module.
If you have any thoughts though, do let the thread know.
Regards,
David.
On 22/01/2019 02:40, Chen-Yu Tsai wrote:
> Hi,
>
> Interested party here. I'd like to get this working on the Pine64 which has
> an RTL8723BS module. I had made some changes and had it working but didn't
> get around to doing the patches yet.
>
> On Tue, Jan 22, 2019 at 4:39 AM David Summers
> <beagleboard@davidjohnsummers.uk> wrote:
>> With the changes requested by Marcel Holtmann and Rob Herring.
>>
>> Capitalisation as requested.
>>
>> Signed-off-by: David Summers <beagleboard@davidjohnsummers.uk>
> The commit log is a bit lacking, as it doesn't provide any context or details
> relevant to the changes in this patch, but also has details that should be
> in the changelog, and not the commit log.
>
>> ---
>> .../bindings/net/realtek-bluetooth-serial.txt | 32 +++++++++++++++++++
>> 1 file changed, 32 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/net/realtek-bluetooth-serial.txt
>>
>> diff --git a/Documentation/devicetree/bindings/net/realtek-bluetooth-serial.txt b/Documentation/devicetree/bindings/net/realtek-bluetooth-serial.txt
>> new file mode 100644
>> index 000000000000..2eddde1a0cf1
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/realtek-bluetooth-serial.txt
>> @@ -0,0 +1,32 @@
>> +Realtek Bluetooth devices connected via a UART.
>> +These devices typically also have a WI-FI connected via SDIO - the
>> +compatible described here is used just for referencing the Bluetooth.
>> +
>> +- compatible: should be "realtek,<name>-bt"
>> + except for "realtek,trl8761atv" - which only has a serial Bluetooth connection
>> + "realtek,rtl8723as-bt"
>> + "realtek,rtl8723bs-bt"
>> + "realtek,rtl8723ds-bt"
>> + "realtek,rtl8761atv"
>> + "realtek,rtl8821as-bt"
>> + "realtek,rtl8821cs-bt"
>> + "realtek,rtl8822bs-bt"
>> +
>> +Example:
>> +
>> +&uart0 {
>> + status = "okay";
>> + pinctrl-0 = <&uart0_xfer>, <&uart0_cts>;
>> + bluetooth {
>> + compatible = "realtek,rtl8723bs-bt";
>> + uart_rts_gpios = <&gpio4 19 GPIO_ACTIVE_LOW>;
>> + pinctrl-names = "default","rts_gpio";
>> + pinctrl-0 = <&uart0_rts>;
>> + pinctrl-1 = <&uart0_gpios>;
>> + BT,reset_gpio = <&gpio4 29 GPIO_ACTIVE_HIGH>;
>> + BT,wake_gpio = <&gpio4 26 GPIO_ACTIVE_HIGH>;
>> + BT,wake_host_irq = <&gpio4 31 GPIO_ACTIVE_HIGH>;
> You haven't listed these three properties in the bindings.
>
> Second, for the last one, the property name says irq, but it takes
> a GPIO phandle. This is slightly misleading.
>
> Furthermore, ACPI already uses the names "device-wake-gpios",
> "enable-gpios", and "host-wake-gpios". Would it be possible to
> stick to those?
>
> Last, you don't actually add support for them in the driver.
>
> So why are they there?
>
> Regards
> ChenYu
>
>> + };
>> +};
>> +
>> +this ensures that the Bluetooth device is tied to the correct uart.
>> --
>> beagleboard@davidjohnsummers.uk
>>
next prev parent reply other threads:[~2019-01-25 19:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-21 20:39 [PATCH v4 1/2] Bluetooth: hci_h5: Add the Realtek compatible flags for the device tree David Summers
2019-01-21 20:39 ` [PATCH v4 2/2] dt-bindings: Create the file for Realtek Bluetooth serial devices David Summers
2019-01-22 2:40 ` Chen-Yu Tsai
2019-01-25 19:03 ` David Summers [this message]
2019-01-25 19:46 ` Rob Herring
2019-01-26 14:26 ` David Summers
2019-01-22 2:42 ` [PATCH v4 1/2] Bluetooth: hci_h5: Add the Realtek compatible flags for the device tree Chen-Yu Tsai
2019-01-26 14:28 ` David Summers
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