linux-kernel - Re: BCM2048 bluetooth connected over OMAP serial

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Date:	Wed, 10 Dec 2014 18:42:03 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pavel Machek <pavel@....cz>,
	"pali.rohar@...il.com" <pali.rohar@...il.com>,
	"sre@...ian.org" <sre@...ian.org>, "sre@...g0.de" <sre@...g0.de>,
	kernel list <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"khilman@...nel.org" <khilman@...nel.org>,
	"aaro.koskinen@....fi" <aaro.koskinen@....fi>,
	"ivo.g.dimitrov.75@...il.com" <ivo.g.dimitrov.75@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>
Subject: Re: BCM2048 bluetooth connected over OMAP serial

On Wed, Dec 10, 2014 at 05:02:42PM +0000, Arnd Bergmann wrote:
> On Wednesday 10 December 2014 17:43:33 Pavel Machek wrote:
> > 
> > So, there's bluetooth chip that's connected to the SoC by UART and some
> > GPIOs. What would be right representation in the device tree?
> > Something like this?
> > 
> >         bluetooth {
> >                   compatible = "broadcom,bcm2048";
> >                   uart = <&uart2>;
> >                   reset-gpios = <&gpio3 27 GPIO_ACTIVE_HIGH>; /* want 91 */
> >                   host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* want 101 */
> >                   bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* want 37 */
> >                   chip-type = >;
> >                   bt-sysclk = <2>;
> >                   reset-gpio-shared = <0>;
> >         };
> > 
> > Is there some way to prevent OMAP tty driver from binding to the
> > device and exporting the device to userspace?
> 
> I think from the driver perspective, you want this to be a tty line
> discipline rather than a driver that attaches to the physical
> uart.
> 
> For the DT representation, I fear we haven't got a precedent. A uart
> phandle sounds reasonable, but there might be other ways to do it
> and we should consider if there are better alternatives. It could
> possibly be a child node of the uart, but that would require other
> infrastructure in the kernel because we don't currently create
> devices for those.

I think the child node is the way to go; that would match what we do for
I2C and SPI. We might need new infrastructure, but I don't think we
should treat this differently simlpy because we don't have that yet.

Mark.
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