From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Cc: Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Matthias Kaehlcke <mka@chromium.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-mtp: Add WCN3990 BT node
Date: Thu, 17 Jan 2019 13:53:24 -0800 [thread overview]
Message-ID: <20190117215323.GB12955@builder> (raw)
In-Reply-To: <aebd3bbb4bb3faac2570244af610b43d@codeaurora.org>
On Wed 16 Jan 22:10 PST 2019, Balakrishna Godavarthi wrote:
> Hi Anderson,
>
> On 2019-01-17 10:10, Bjorn Andersson wrote:
[..]
> > +&qup_uart6_default {
> > + pinmux {
> > + pins = "gpio45", "gpio46", "gpio47", "gpio48";
> > + function = "qup6";
> > + };
> > +
> > + ctsrx {
> > + pins = "gpio45", "gpio48";
> > + drive-strength = <2>;
> > + bias-no-pull;
> > + };
> > +
> > + rts {
> > + pins = "gpio46";
> > + drive-strength = <2>;
> > + bias-pull-down;
> > + };
> > +
> > + tx {
> > + pins = "gpio47";
> > + drive-strength = <2>;
> > + bias-pull-up;
> > + };
> > +};
> > +
> > &qup_uart9_default {
> > pinconf-tx {
> > pins = "gpio4";
>
>
> [Bala]:
> GPIO 45 is CTS
> GPIO 46 is RTS
> GPIO 47 is Tx
> GPIO 48 is Rx.
>
> Tx & RTS are inputs to APPS processor, bias should be disable as the
> source i.e. BT chip will pull them up.
> CTS & RX are outputs from APPS processor, where as CTS is GPIO which
> need to toggled, so the default state should be pull down.
> RX is should be pulled up.
> when TX & RX are pulled high it indicates that the lines are ideal
> i.e. no data.
>
> Above is just my assumption, not sure whether they work on MTP.
>
I will update and verify.
Thanks,
Bjorn
next prev parent reply other threads:[~2019-01-17 21:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-17 4:40 [PATCH] arm64: dts: qcom: sdm845-mtp: Add WCN3990 BT node Bjorn Andersson
2019-01-17 6:10 ` Balakrishna Godavarthi
2019-01-17 21:53 ` Bjorn Andersson [this message]
2019-01-17 19:28 ` Matthias Kaehlcke
2019-01-17 21:55 ` Bjorn Andersson
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