[PATCH V3 04/11] dt-bindings: PCI: tegra234: Add schema for tegra234 endpoint mode

From: Vidya Sagar
Date: Wed Jun 29 2022 - 02:05:25 EST

Add support for PCIe controllers that operate in the endpoint mode
in tegra234 chipset.

Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
---
V3:
* New patch in this series

.../bindings/pci/nvidia,tegra194-pcie-ep.yaml | 141 +++++++++++++++++-
1 file changed, 136 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml
index 4f7cb7fe378e..11778eb92c47 100644
--- a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml
@@ -17,6 +17,7 @@ description: |
in they can work either in root port mode or endpoint mode but one at a time.

On Tegra194, controllers C0, C4 and C5 support endpoint mode.
+ On Tegra234, controllers C5, C6, C7 and C10 support endpoint mode.

Note: On Tegra194's P2972-0000 platform, only C5 controller can be enabled to operate in the
endpoint mode because of the way the platform is designed.
@@ -25,6 +26,7 @@ properties:
compatible:
enum:
- nvidia,tegra194-pcie-ep
+ - nvidia,tegra234-pcie-ep

reg:
items:
@@ -87,6 +89,8 @@ properties:
name for the PCIe controller. Following are the specifiers for the different PCIe
controllers:

+ Tegra194
+
- TEGRA194_POWER_DOMAIN_PCIEX8B: C0
- TEGRA194_POWER_DOMAIN_PCIEX1A: C1
- TEGRA194_POWER_DOMAIN_PCIEX1A: C2
@@ -96,6 +100,22 @@ properties:

these specifiers are defined in "include/dt-bindings/power/tegra194-powergate.h" file.

+ Tegra234
+
+ - TEGRA234_POWER_DOMAIN_PCIEX4BA: C0
+ - TEGRA234_POWER_DOMAIN_PCIEX1A : C1
+ - TEGRA234_POWER_DOMAIN_PCIEX1A : C2
+ - TEGRA234_POWER_DOMAIN_PCIEX1A : C3
+ - TEGRA234_POWER_DOMAIN_PCIEX4BB: C4
+ - TEGRA234_POWER_DOMAIN_PCIEX8A : C5
+ - TEGRA234_POWER_DOMAIN_PCIEX4A : C6
+ - TEGRA234_POWER_DOMAIN_PCIEX8B : C7
+ - TEGRA234_POWER_DOMAIN_PCIEX4CA: C8
+ - TEGRA234_POWER_DOMAIN_PCIEX4CB: C9
+ - TEGRA234_POWER_DOMAIN_PCIEX4CC: C10
+
+ these specifiers are defined in "include/dt-bindings/power/tegra234-powergate.h" file.
+
interconnects:
items:
- description: memory read client
@@ -124,17 +144,30 @@ properties:
Must contain a pair of phandle to BPMP controller node followed by controller ID. Following
are the controller IDs for each controller:

+ Tegra194
+
0: C0
1: C1
2: C2
3: C3
4: C4
5: C5
- items:
- - items:
- - minimum: 0
- maximum: 0xffffffff
- - enum: [ 0, 1, 2, 3, 4, 5 ]
+
+ Tegra234
+
+ 0 : C0
+ 1 : C1
+ 2 : C2
+ 3 : C3
+ 4 : C4
+ 5 : C5
+ 6 : C6
+ 7 : C7
+ 8 : C8
+ 9 : C9
+ 10: C10
+
+ Platform constraints are described later

nvidia,aspm-cmrt-us:
description: Common Mode Restore Time for proper operation of ASPM to be specified in
@@ -154,9 +187,47 @@ properties:
enable REFCLK to controller from host
$ref: /schemas/types.yaml#/definitions/phandle-array

+ nvidia,enable-srns:
+ description: |
+ This boolean property needs to be present if the controller is configured
+ to operate in SRNS (Separate Reference Clocks with No Spread-Spectrum Clocking).
+ NOTE:- This is applicable only for Tegra234.
+
+ $ref: /schemas/types.yaml#/definitions/flag
+
allOf:
- $ref: "/schemas/pci/pci-ep.yaml#"

+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - nvidia,tegra194-pcie
+ then:
+ properties:
+ nvidia,bpmp:
+ items:
+ - items:
+ - minimum: 0
+ maximum: 0xffffffff
+ - enum: [ 0, 1, 2, 3, 4, 5 ]
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - nvidia,tegra234-pcie
+ then:
+ properties:
+ nvidia,bpmp:
+ items:
+ - items:
+ - minimum: 0
+ maximum: 0xffffffff
+ - enum: [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
+
unevaluatedProperties: false

required:
@@ -174,6 +245,7 @@ required:
- power-domains
- reset-gpios
- num-lanes
+ - vddio-pex-ctl-supply
- phys
- phy-names
- nvidia,bpmp
@@ -237,3 +309,62 @@ examples:
"p2u-5", "p2u-6", "p2u-7";
};
};
+
+ - |
+ #include <dt-bindings/clock/tegra234-clock.h>
+ #include <dt-bindings/gpio/tegra234-gpio.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/power/tegra234-powergate.h>
+ #include <dt-bindings/reset/tegra234-reset.h>
+
+ bus@0 {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges = <0x0 0x0 0x0 0x8 0x0>;
+
+ pcie-ep@141a0000 {
+ compatible = "nvidia,tegra234-pcie-ep";
+ power-domains = <&bpmp TEGRA234_POWER_DOMAIN_PCIEX8A>;
+ reg = <0x00 0x141a0000 0x0 0x00020000>, /* appl registers (128K) */
+ <0x00 0x3a040000 0x0 0x00040000>, /* iATU_DMA reg space (256K) */
+ <0x00 0x3a080000 0x0 0x00040000>, /* DBI reg space (256K) */
+ <0x27 0x40000000 0x4 0x00000000>; /* Address Space (16G) */
+ reg-names = "appl", "atu_dma", "dbi", "addr_space";
+
+ interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>; /* controller interrupt */
+ interrupt-names = "intr";
+
+ clocks = <&bpmp TEGRA234_CLK_PEX1_C5_CORE>;
+ clock-names = "core";
+
+ resets = <&bpmp TEGRA234_RESET_PEX1_CORE_5_APB>,
+ <&bpmp TEGRA234_RESET_PEX1_CORE_5>;
+ reset-names = "apb", "core";
+
+ nvidia,bpmp = <&bpmp 5>;
+
+ nvidia,enable-ext-refclk;
+ nvidia,aspm-cmrt-us = <60>;
+ nvidia,aspm-pwr-on-t-us = <20>;
+ nvidia,aspm-l0s-entrance-latency-us = <3>;
+
+ vddio-pex-ctl-supply = <&p3701_vdd_1v8_ls>;
+
+ reset-gpios = <&gpio TEGRA234_MAIN_GPIO(AF, 1) GPIO_ACTIVE_LOW>;
+
+ nvidia,refclk-select-gpios = <&gpio_aon
+ TEGRA234_AON_GPIO(AA, 4)
+ GPIO_ACTIVE_HIGH>;
+
+ num-lanes = <8>;
+ num-ib-windows = <2>;
+ num-ob-windows = <8>;
+
+ phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
+ <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
+ <&p2u_nvhs_6>, <&p2u_nvhs_7>;
+
+ phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
+ "p2u-5", "p2u-6", "p2u-7";
+ };
+ };
--
2.17.1