linux-kernel - Re: [PATCH v2 2/5] arm64: qcom: dts: qrb5165-rb5: add qca6391 power device

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Date:   Sat, 30 Jan 2021 09:29:39 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 2/5] arm64: qcom: dts: qrb5165-rb5: add qca6391 power
 device

On Fri, Jan 29, 2021 at 09:47:37PM -0600, Bjorn Andersson wrote:
> On Thu 28 Jan 11:52 CST 2021, Dmitry Baryshkov wrote:
> 
> > Add qca6391 to device tree as a way to provide power domain to WiFi and
> > BT parts of the chip.
> > 
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 61 ++++++++++++++++++++++++
> >  1 file changed, 61 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > index 8aebc3660b11..2b0c1cc9333b 100644
> > --- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > +++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > @@ -151,6 +151,23 @@ vreg_s4a_1p8: vreg-s4a-1p8 {
> >  		regulator-max-microvolt = <1800000>;
> >  		regulator-always-on;
> >  	};
> > +
> > +	qca6391: qca6391 {
> > +		compatible = "qcom,qca6390";
> > +		#power-domain-cells = <0>;
> > +
> > +		vddaon-supply = <&vreg_s6a_0p95>;
> > +		vddpmu-supply = <&vreg_s2f_0p95>;
> > +		vddrfa1-supply = <&vreg_s2f_0p95>;
> > +		vddrfa2-supply = <&vreg_s8c_1p3>;
> > +		vddrfa3-supply = <&vreg_s5a_1p9>;
> > +		vddpcie1-supply = <&vreg_s8c_1p3>;
> > +		vddpcie2-supply = <&vreg_s5a_1p9>;
> > +		vddio-supply = <&vreg_s4a_1p8>;
> > +		pinctrl-names = "default", "active";
> > +		pinctrl-0 = <&wlan_default_state &bt_default_state>;
> > +		pinctrl-1 = <&wlan_active_state &bt_active_state>;
> 
> I dislike the use of pinctrl states for toggling the level of the gpio
> and would prefer that you use the gpio binding and api for this instead.
> 
> > +	};
> >  };
> >  
> >  &adsp {
> > @@ -1013,6 +1030,28 @@ &tlmm {
> >  		"HST_WLAN_UART_TX",
> >  		"HST_WLAN_UART_RX";
> >  
> > +	bt_default_state: bt-default-state {
> 
> Are you sure you need to drive the BT_EN pin in order to have WiFi
> working? On QCA6174 I believe the "WL_EN" was actually RESET_N and BT_EN
> was actually "blueooth enable" - so we wired that in the bluetooth node
> instead.
> 

IIRC, that's the case. We need both BT_EN and WL_EN for proper bringup of the
chip.

Thanks,
Mani