On Thu, Sep 03, 2020 at 08:34:57PM +0530, satya priya wrote: > Add sleep state for BT uart to support the wakeup feature. > > Signed-off-by: satya priya <[email protected]> > Reviewed-by: Akash Asthana <[email protected]> > --- > Changes in V2: > - This patch adds sleep state for BT UART. Newly added in V2. > > Changes in V3: > - Remove "output-high" for TX from both sleep and default states > as it is not required. Configure pull-up for TX in sleep state. > > Changes in V4: > - As per Matthias's comment, removed drive-strength for sleep state > and fixed nit-pick. > > arch/arm64/boot/dts/qcom/sc7180-idp.dts | 37 > +++++++++++++++++++++++++++++++++ > 1 file changed, 37 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts > b/arch/arm64/boot/dts/qcom/sc7180-idp.dts > index cecac3e..77e3523 100644 > --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts > +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts > @@ -507,6 +507,43 @@ > }; > }; > > +&qup_uart3_sleep { > + pinconf-cts { > + /* > + * Configure no-pull on CTS. As this is driven by BT, do not > + * specify any pull in order to not conflict with BT pulls. > + */ > + pins = "gpio38"; > + bias-disable; > + }; > + > + pinconf-rts { > + /* > + * Configure pull-down on RTS to make sure that the BT SoC can > + * wake up the system by sending wakeup bytes during suspend. > + */ > + pins = "gpio39"; > + bias-pull-down; > + }; > + > + pinconf-tx { > + /* Configure pull-up on TX when it isn't actively driven */ > + pins = "gpio40"; > + bias-pull-up; > + }; > + > + pinconf-rx { > + /* > + * Configure a pull-up on RX. This is needed to avoid > + * garbage data when the TX pin of the Bluetooth module is > + * in tri-state (module powered off or not driving the > + * signal yet). > + */ > + pins = "gpio41"; > + bias-pull-up; > + }; > +}; > + > &qup_uart8_default { > pinconf-tx { > pins = "gpio44";
Reviewed-by: Matthias Kaehlcke <[email protected]>
