linux-kernel - [PATCH v2 4/5] arm64: dtb: qcom: qrb5165-rb5: add bridge@0,0 to power up qca6391 chip

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Message-Id: <20210128175225.3102958-5-dmitry.baryshkov@linaro.org>
Date:   Thu, 28 Jan 2021 20:52:24 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.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>
Cc:     linux-arm-msm@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: [PATCH v2 4/5] arm64: dtb: qcom: qrb5165-rb5: add bridge@0,0 to power up qca6391 chip

If QCA6391 chip (connected to PCIe0) is not powered at the PCIe probe
time, PCIe0 bus probe will timeout and the device will not be detected.
So use qca6391 as pcie0's bridge power-domain.  This allows us to make
sure that QCA6391 chip is powered on before PCIe0 probe happens.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
index 2b0c1cc9333b..b39a9729395f 100644
--- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
+++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
@@ -581,6 +581,18 @@ &pcie0 {
 	wake-gpio = <&tlmm 81 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pcie0_default_state>;
+
+	bridge@0,0 {
+		compatible = "pci17cb,010b";
+                reg = <0 0 0 0 0>;
+
+                #address-cells = <3>;
+                #size-cells = <2>;
+                #interrupt-cells = <1>;
+
+		/* Power on QCA639x chip sitting behind this bridge. */
+		power-domains = <&qca6391>;
+	};
 };
 
 &pcie0_phy {
-- 
2.29.2