Re: [PATCH v6 1/4] dt-bindings: pci: mediatek: Modified the Device tree bindings

Rob Herring
2020-09-22T23:32:03Z

On Mon, Sep 14, 2020 at 07:26:56PM +0800, Chuanjia Liu wrote:
> Split the PCIe node and add pciecfg node to fix MSI issue.

What's the MSI issue?

This is not a compatible change. Please explain why that's okay.

>
> Signed-off-by: Chuanjia Liu <chuanjia.liu@mediatek.com>
> Acked-by: Ryder Lee <ryder.lee@mediatek.com>
> ---
> .../bindings/pci/mediatek-pcie-cfg.yaml | 37 +++++
> .../devicetree/bindings/pci/mediatek-pcie.txt | 139 +++++++++++-------
> 2 files changed, 123 insertions(+), 53 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/pci/mediatek-pcie-cfg.yaml
>
> diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie-cfg.yaml b/Documentation/devicetree/bindings/pci/mediatek-pcie-cfg.yaml
> new file mode 100644
> index 000000000000..cd72973c99d5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/mediatek-pcie-cfg.yaml
> @@ -0,0 +1,37 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/mediatek-pcie-cfg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek PCIECFG controller
> +
> +maintainers:
> + - Chuanjia Liu <chuanjia.liu@mediatek.com>
> + - Jianjun Wang <jianjun.wang@mediatek.com>
> +
> +description: |
> + The MediaTek PCIECFG controller controls some feature about
> + LTSSM, ASPM and so on.
> +
> +properties:
> + compatible:
> + items:
> + - enum:
> + - mediatek,generic-pciecfg
> + - const: syscon
> +
> + reg:
> + maxItems: 1
> +
> +required:
> + - compatible
> + - reg

additionalProperties: false

> +
> +examples:
> + - |
> + pciecfg: pciecfg@1a140000 {
> + compatible = "mediatek,generic-pciecfg", "syscon";
> + reg = <0x1a140000 0x1000>;
> + };
> +...
> diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie.txt b/Documentation/devicetree/bindings/pci/mediatek-pcie.txt
> index 7468d666763a..f849703dfb17 100644
> --- a/Documentation/devicetree/bindings/pci/mediatek-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/mediatek-pcie.txt
> @@ -8,7 +8,7 @@ Required properties:
> "mediatek,mt7623-pcie"
> "mediatek,mt7629-pcie"
> - device_type: Must be "pci"
> -- reg: Base addresses and lengths of the PCIe subsys and root ports.
> +- reg: Base addresses and lengths of the root ports.
> - reg-names: Names of the above areas to use during resource lookup.
> - #address-cells: Address representation for root ports (must be 3)
> - #size-cells: Size representation for root ports (must be 2)
> @@ -19,10 +19,10 @@ Required properties:
> - sys_ckN :transaction layer and data link layer clock
> Required entries for MT2701/MT7623:
> - free_ck :for reference clock of PCIe subsys
> - Required entries for MT2712/MT7622:
> + Required entries for MT2712/MT7622/MT7629:

Seems like a unrelated change.

> - ahb_ckN :AHB slave interface operating clock for CSR access and RC
> initiated MMIO access
> - Required entries for MT7622:
> + Required entries for MT7622/MT7629:
> - axi_ckN :application layer MMIO channel operating clock
> - aux_ckN :pe2_mac_bridge and pe2_mac_core operating clock when
> pcie_mac_ck/pcie_pipe_ck is turned off
> @@ -47,7 +47,7 @@ Required properties for MT7623/MT2701:
> - reset-names: Must be "pcie-rst0", "pcie-rst1", "pcie-rstN".. based on the
> number of root ports.
>
> -Required properties for MT2712/MT7622:
> +Required properties for MT2712/MT7622/MT7629:
> -interrupts: A list of interrupt outputs of the controller, must have one
> entry for each PCIe port
>
> @@ -143,56 +143,73 @@ Examples for MT7623:
>
> Examples for MT2712:
>
> - pcie: pcie@11700000 {
> + pcie1: pcie@112ff000 {
> compatible = "mediatek,mt2712-pcie";
> device_type = "pci";
> - reg = <0 0x11700000 0 0x1000>,
> - <0 0x112ff000 0 0x1000>;
> - reg-names = "port0", "port1";
> + reg = <0 0x112ff000 0 0x1000>;
> + reg-names = "port1";
> #address-cells = <3>;
> #size-cells = <2>;
> - interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&topckgen CLK_TOP_PE2_MAC_P0_SEL>,
> - <&topckgen CLK_TOP_PE2_MAC_P1_SEL>,
> - <&pericfg CLK_PERI_PCIE0>,
> + interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "pcie_irq";
> + clocks = <&topckgen CLK_TOP_PE2_MAC_P1_SEL>,
> <&pericfg CLK_PERI_PCIE1>;
> - clock-names = "sys_ck0", "sys_ck1", "ahb_ck0", "ahb_ck1";
> - phys = <&pcie0_phy PHY_TYPE_PCIE>, <&pcie1_phy PHY_TYPE_PCIE>;
> - phy-names = "pcie-phy0", "pcie-phy1";
> + clock-names = "sys_ck1", "ahb_ck1";
> + phys = <&u3port1 PHY_TYPE_PCIE>;
> + phy-names = "pcie-phy1";
> bus-range = <0x00 0xff>;
> - ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x10000000>;
> + ranges = <0x82000000 0 0x11400000 0x0 0x11400000 0 0x300000>;
> + status = "disabled";

Don't show status in examples.

>
> - pcie0: pcie@0,0 {
> - reg = <0x0000 0 0 0 0>;
> + slot1: pcie@1,0 {

Since you are breaking everything, you don't really need these child
nodes. Just move interrupt-map and interrupt-controller up to the parent
like other PCI host bindings.

> + reg = <0x0800 0 0 0 0>;
> #address-cells = <3>;
> #size-cells = <2>;
> #interrupt-cells = <1>;
> ranges;
> interrupt-map-mask = <0 0 0 7>;
> - interrupt-map = <0 0 0 1 &pcie_intc0 0>,
> - <0 0 0 2 &pcie_intc0 1>,
> - <0 0 0 3 &pcie_intc0 2>,
> - <0 0 0 4 &pcie_intc0 3>;
> - pcie_intc0: interrupt-controller {
> + interrupt-map = <0 0 0 1 &pcie_intc1 0>,
> + <0 0 0 2 &pcie_intc1 1>,
> + <0 0 0 3 &pcie_intc1 2>,
> + <0 0 0 4 &pcie_intc1 3>;
> + pcie_intc1: interrupt-controller {
> interrupt-controller;
> #address-cells = <0>;
> #interrupt-cells = <1>;
> };
> };
> + };
>
> - pcie1: pcie@1,0 {
> - reg = <0x0800 0 0 0 0>;
> + pcie0: pcie@11700000 {
> + compatible = "mediatek,mt2712-pcie";
> + device_type = "pci";
> + reg = <0 0x11700000 0 0x1000>;
> + reg-names = "port0";
> + #address-cells = <3>;
> + #size-cells = <2>;
> + interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "pcie_irq";
> + clocks = <&topckgen CLK_TOP_PE2_MAC_P0_SEL>,
> + <&pericfg CLK_PERI_PCIE0>;
> + clock-names = "sys_ck0", "ahb_ck0";
> + phys = <&u3port0 PHY_TYPE_PCIE>;
> + phy-names = "pcie-phy0";
> + bus-range = <0x00 0xff>;
> + ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x10000000>;
> + status = "disabled";
> +
> + slot0: pcie@0,0 {
> + reg = <0x0000 0 0 0 0>;
> #address-cells = <3>;
> #size-cells = <2>;
> #interrupt-cells = <1>;
> ranges;
> interrupt-map-mask = <0 0 0 7>;
> - interrupt-map = <0 0 0 1 &pcie_intc1 0>,
> - <0 0 0 2 &pcie_intc1 1>,
> - <0 0 0 3 &pcie_intc1 2>,
> - <0 0 0 4 &pcie_intc1 3>;
> - pcie_intc1: interrupt-controller {
> + interrupt-map = <0 0 0 1 &pcie_intc0 0>,
> + <0 0 0 2 &pcie_intc0 1>,
> + <0 0 0 3 &pcie_intc0 2>,
> + <0 0 0 4 &pcie_intc0 3>;
> + pcie_intc0: interrupt-controller {
> interrupt-controller;
> #address-cells = <0>;
> #interrupt-cells = <1>;
> @@ -202,39 +219,30 @@ Examples for MT2712:
>
> Examples for MT7622:
>
> - pcie: pcie@1a140000 {
> + pcie0: pcie@1a143000 {
> compatible = "mediatek,mt7622-pcie";
> device_type = "pci";
> - reg = <0 0x1a140000 0 0x1000>,
> - <0 0x1a143000 0 0x1000>,
> - <0 0x1a145000 0 0x1000>;
> - reg-names = "subsys", "port0", "port1";
> + reg = <0 0x1a143000 0 0x1000>;
> + reg-names = "port0";
> #address-cells = <3>;
> #size-cells = <2>;
> - interrupts = <GIC_SPI 228 IRQ_TYPE_LEVEL_LOW>,
> - <GIC_SPI 229 IRQ_TYPE_LEVEL_LOW>;
> + interrupts = <GIC_SPI 228 IRQ_TYPE_LEVEL_LOW>;
> + interrupt-names = "pcie_irq";
> clocks = <&pciesys CLK_PCIE_P0_MAC_EN>,
> - <&pciesys CLK_PCIE_P1_MAC_EN>,
> <&pciesys CLK_PCIE_P0_AHB_EN>,
> - <&pciesys CLK_PCIE_P1_AHB_EN>,
> <&pciesys CLK_PCIE_P0_AUX_EN>,
> - <&pciesys CLK_PCIE_P1_AUX_EN>,
> <&pciesys CLK_PCIE_P0_AXI_EN>,
> - <&pciesys CLK_PCIE_P1_AXI_EN>,
> <&pciesys CLK_PCIE_P0_OBFF_EN>,
> - <&pciesys CLK_PCIE_P1_OBFF_EN>,
> - <&pciesys CLK_PCIE_P0_PIPE_EN>,
> - <&pciesys CLK_PCIE_P1_PIPE_EN>;
> - clock-names = "sys_ck0", "sys_ck1", "ahb_ck0", "ahb_ck1",
> - "aux_ck0", "aux_ck1", "axi_ck0", "axi_ck1",
> - "obff_ck0", "obff_ck1", "pipe_ck0", "pipe_ck1";
> - phys = <&pcie0_phy PHY_TYPE_PCIE>, <&pcie1_phy PHY_TYPE_PCIE>;
> - phy-names = "pcie-phy0", "pcie-phy1";
> + <&pciesys CLK_PCIE_P0_PIPE_EN>;
> + clock-names = "sys_ck0", "ahb_ck0", "aux_ck0",
> + "axi_ck0", "obff_ck0", "pipe_ck0";
> +
> power-domains = <&scpsys MT7622_POWER_DOMAIN_HIF0>;
> bus-range = <0x00 0xff>;
> - ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x10000000>;
> + ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x8000000>;
> + status = "disabled";
>
> - pcie0: pcie@0,0 {
> + slot0: pcie@0,0 {
> reg = <0x0000 0 0 0 0>;
> #address-cells = <3>;
> #size-cells = <2>;
> @@ -251,8 +259,33 @@ Examples for MT7622:
> #interrupt-cells = <1>;
> };
> };
> + };
> +
> + pcie1: pcie@1a145000 {
> + compatible = "mediatek,mt7622-pcie";
> + device_type = "pci";
> + reg = <0 0x1a145000 0 0x1000>;
> + reg-names = "port1";
> + #address-cells = <3>;
> + #size-cells = <2>;
> + interrupts = <GIC_SPI 229 IRQ_TYPE_LEVEL_LOW>;
> + interrupt-names = "pcie_irq";
> + clocks = <&pciesys CLK_PCIE_P1_MAC_EN>,
> + /* designer has connect RC1 with p0_ahb clock */
> + <&pciesys CLK_PCIE_P0_AHB_EN>,
> + <&pciesys CLK_PCIE_P1_AUX_EN>,
> + <&pciesys CLK_PCIE_P1_AXI_EN>,
> + <&pciesys CLK_PCIE_P1_OBFF_EN>,
> + <&pciesys CLK_PCIE_P1_PIPE_EN>;
> + clock-names = "sys_ck1", "ahb_ck1", "aux_ck1",
> + "axi_ck1", "obff_ck1", "pipe_ck1";
> +
> + power-domains = <&scpsys MT7622_POWER_DOMAIN_HIF0>;
> + bus-range = <0x00 0xff>;
> + ranges = <0x82000000 0 0x28000000 0x0 0x28000000 0 0x8000000>;
> + status = "disabled";
>
> - pcie1: pcie@1,0 {
> + slot1: pcie@1,0 {
> reg = <0x0800 0 0 0 0>;
> #address-cells = <3>;
> #size-cells = <2>;
> --
> 2.18.0