Re: [PATCH V3 5/6] arm64: dts: qcom: ipq9574: Enable PCIe PHYs and controllers

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On 5/8/2023 5:09 PM, Dmitry Baryshkov wrote:
On 08/05/2023 13:55, Devi Priya wrote:


On 4/22/2023 5:43 AM, Dmitry Baryshkov wrote:
On Fri, 21 Apr 2023 at 15:51, Devi Priya <quic_devipriy@xxxxxxxxxxx> wrote:

Enable the PCIe controller and PHY nodes corresponding to
RDP 433.

Signed-off-by: Devi Priya <quic_devipriy@xxxxxxxxxxx>
---
  Changes in V3:
         - No change

  arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts | 62 +++++++++++++++++++++
  1 file changed, 62 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
index 7be578017bf7..3ae38cf327ea 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
+++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
@@ -8,6 +8,7 @@

  /dts-v1/;

+#include <dt-bindings/gpio/gpio.h>
  #include "ipq9574.dtsi"

  / {
@@ -43,6 +44,42 @@
         };
  };

+&pcie1_phy {
+       status = "okay";
+};
+
+&pcie1 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pcie_1_pin>;
+
+       perst-gpios = <&tlmm 26 GPIO_ACTIVE_LOW>;

Usually qcom PCIe hosts also define wake-gpios.
In IPQ9574, we do not have hot plug support and host always starts the
enumeration for the device. Hence no wake pin is required.

None of the qcom PCIe hosts support hotplug, if I remember correctly. This is not a reason not to describe the hardware.

Okay, will add the pin definitions for wake and clkreq in the next spin.


+       status = "okay";
+};
+
+&pcie2_phy {
+       status = "okay";
+};
+
+&pcie2 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pcie_2_pin>;
+
+       perst-gpios = <&tlmm 29 GPIO_ACTIVE_LOW>;
+       status = "okay";
+};
+
+&pcie3_phy {
+       status = "okay";
+};
+
+&pcie3 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pcie_3_pin>;
+
+       perst-gpios = <&tlmm 32 GPIO_ACTIVE_LOW>;
+       status = "okay";
+};
+
  &sdhc_1 {
         pinctrl-0 = <&sdc_default_state>;
         pinctrl-names = "default";
@@ -60,6 +97,31 @@
  };

  &tlmm {
+
+       pcie_1_pin: pcie-1-state {
+               pins = "gpio26";
+               function = "gpio";
+               drive-strength = <8>;
+               bias-pull-down;
+               output-low;

No clkreq and no wake gpios?
We do not use any PCIe low power states and link is always in L0.

Again. We = software. Please describe the hardware here.
Got it.


Thanks,
Devi Priya

+       };
+
+       pcie_2_pin: pcie-2-state {
+               pins = "gpio29";
+               function = "gpio";
+               drive-strength = <8>;
+               bias-pull-down;
+               output-low;
+       };
+
+       pcie_3_pin: pcie-3-state {
+               pins = "gpio32";
+               function = "gpio";
+               drive-strength = <8>;
+               bias-pull-up;
+               output-low;
+       };
+
         sdc_default_state: sdc-default-state {
                 clk-pins {
                         pins = "gpio5";
--
2.17.1




Thanks,
Devi Priya



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