[PATCH v3 09/17] dt-bindings: PCI: dwc: Add clocks/resets common properties
Serge Semin
Sergey.Semin at baikalelectronics.ru
Fri Jun 10 01:56:57 PDT 2022
DW PCIe RP/EP reference manuals explicit define all the clocks and reset
requirements in [1] and [2]. Seeing the DW PCIe vendor-specific
DT-bindings have already started assigning random names to the same set of
the clocks and resets lines, let's define a generic names sets and add
them to the DW PCIe definitions in the common DT-schema. These definitions
will be used in the generic DW PCIe DT-schema and can be referenced in the
particular DW PCIe DT-bindings if they are compatible with them, otherwise
the platforms can be left with already defined clocks/resets properties.
[1] Synopsys DesignWare Cores PCI Express Controller Databook - DWC PCIe
Root Port, Version 5.40a, March 2019, p.55 - 78.
[2] Synopsys DesignWare Cores PCI Express Controller Databook - DWC PCIe
Endpoint, Version 5.40a, March 2019, p.58 - 81.
Signed-off-by: Serge Semin <Sergey.Semin at baikalelectronics.ru>
---
Changelog v3:
- This is a new patch unpinned from the next one:
https://lore.kernel.org/linux-pci/20220503214638.1895-2-Sergey.Semin@baikalelectronics.ru/
by the Rob' request. (@Rob)
- Drop synonymous from the names list since the device schemas create
their own enumerations anyway.
---
.../bindings/pci/samsung,exynos-pcie.yaml | 3 +-
.../bindings/pci/snps,dw-pcie-common.yaml | 100 ++++++++++++++++++
.../bindings/pci/snps,dw-pcie-ep.yaml | 26 +++++
.../devicetree/bindings/pci/snps,dw-pcie.yaml | 20 +++-
.../pci/socionext,uniphier-pcie-ep.yaml | 3 +-
5 files changed, 149 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
index 445eed94b53f..fedb774938f4 100644
--- a/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
@@ -16,7 +16,8 @@ description: |+
snps,dw-pcie.yaml.
allOf:
- - $ref: /schemas/pci/snps,dw-pcie.yaml#
+ - $ref: /schemas/pci/pci-bus.yaml#
+ - $ref: /schemas/pci/snps,dw-pcie-common.yaml#
properties:
compatible:
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
index c6a55f90ddd5..f22fb01c9bd0 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
@@ -58,6 +58,36 @@ properties:
minItems: 1
maxItems: 26
+ clocks:
+ description:
+ DWC PCIe reference manual explicitly defines a set of the clocks required
+ to get the controller working correctly. In general all of them can
+ be divided into two groups':' application and core clocks. Note the
+ platforms may have some of the clock sources unspecified in case if the
+ corresponding domains are fed up from a common clock source.
+ minItems: 1
+ maxItems: 7
+
+ clock-names:
+ minItems: 1
+ maxItems: 7
+
+ resets:
+ description:
+ DWC PCIe reference manual explicitly defines a set of the reset
+ signals required to be de-asserted to properly activate the controller
+ sub-parts. All of these signals can be divided into two sub-groups':'
+ application and core resets with respect to the main sub-domains they
+ are supposed to reset. Note the platforms may have some of these signals
+ unspecified in case if they are automatically handled or aggregated into
+ a comprehensive control module.
+ minItems: 1
+ maxItems: 10
+
+ reset-names:
+ minItems: 1
+ maxItems: 10
+
phys:
description:
There can be up to the number of possible lanes PHYs specified.
@@ -218,4 +248,74 @@ definitions:
uncorrectable error.
const: sft_ue
+ clock-names:
+ description:
+ Reference clock names common for the DWC PCIe Root Port and Endpoint
+ controllers.
+ anyOf:
+ - description:
+ Data Bus Interface (DBI) clock. Clock signal for the AXI-bus
+ interface of the Configuration-Dependent Module, which is
+ basically the set of the controller CSRs.
+ const: dbi
+ - description:
+ Application AXI-bus Master interface clock. Basically this is
+ a clock for the controller DMA interface (PCI-to-CPU).
+ const: mstr
+ - description:
+ Application AXI-bus Slave interface clock. This is a clock for
+ the CPU-to-PCI memory IO interface.
+ const: slv
+ - description:
+ Controller Core-PCS PIPE interface clock. It's normally
+ supplied by an external PCS-PHY.
+ const: pipe
+ - description:
+ Controller Primary clock. It's assumed that all controller input
+ signals (except resets) are synchronous to this clock.
+ const: core
+ - description:
+ Auxiliary clock for the controller PMC domain. The controller
+ partitioning implies having some parts to operate with this
+ clock in some power management states.
+ const: aux
+ - description:
+ Generic reference clock. In case if there are several
+ interfaces fed up with a common clock source it's advisable to
+ define it with this name (for instance pipe, core and aux can
+ be connected to a single source of the periodic signal).
+ const: ref
+ - description:
+ Clock for the PHY registers interface. Originally this is
+ a PHY-viewport-based interface, but some platform may have
+ specifically designed one.
+ const: phy_reg
+
+ reset-names:
+ description:
+ Reset signal names common for the DWC PCIe Root Port and Endpoint
+ controllers.
+ anyOf:
+ - description: Data Bus Interface (DBI) domain reset
+ const: dbi
+ - description: AXI-bus Master interface reset
+ const: mstr
+ - description: AXI-bus Slave interface reset
+ const: slv
+ - description: Controller Non-sticky CSR flags reset
+ const: non-sticky
+ - description: Controller sticky CSR flags reset
+ const: sticky
+ - description: PIPE-interface (Core-PCS) logic reset
+ const: pipe
+ - description:
+ Controller primary reset (resets everything except PMC module)
+ const: core
+ - description: PCS/PHY block reset
+ const: phy
+ - description: PMC hot reset signal
+ const: hot
+ - description: Cold reset signal
+ const: pwr
+
...
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
index bfff723b529d..bb7e4381d392 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
@@ -74,6 +74,26 @@ properties:
items:
$ref: /schemas/pci/snps,dw-pcie-common.yaml#/definitions/interrupt-names
+ clocks:
+ minItems: 1
+ maxItems: 7
+
+ clock-names:
+ minItems: 1
+ maxItems: 7
+ items:
+ $ref: /schemas/pci/snps,dw-pcie-common.yaml#/definitions/clock-names
+
+ resets:
+ minItems: 1
+ maxItems: 10
+
+ reset-names:
+ minItems: 1
+ maxItems: 10
+ items:
+ $ref: /schemas/pci/snps,dw-pcie-common.yaml#/definitions/reset-names
+
max-functions:
maximum: 32
@@ -109,6 +129,12 @@ examples:
interrupts = <23>, <24>;
interrupt-names = "dma0", "dma1";
+ clocks = <&sys_clk 12>, <&sys_clk 24>;
+ clock-names = "dbi", "ref";
+
+ resets = <&sys_rst 12>, <&sys_rst 24>;
+ reset-names = "dbi", "phy";
+
phys = <&pcie_phy0>, <&pcie_phy1>, <&pcie_phy2>, <&pcie_phy3>;
phy-names = "pcie0", "pcie1", "pcie2", "pcie3";
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
index 9e96c6d0ef48..518fa5626c11 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
@@ -78,7 +78,25 @@ properties:
- contains:
const: msi
- clocks: true
+ clocks:
+ minItems: 1
+ maxItems: 7
+
+ clock-names:
+ minItems: 1
+ maxItems: 7
+ items:
+ $ref: /schemas/pci/snps,dw-pcie-common.yaml#/definitions/clock-names
+
+ resets:
+ minItems: 1
+ maxItems: 10
+
+ reset-names:
+ minItems: 1
+ maxItems: 10
+ items:
+ $ref: /schemas/pci/snps,dw-pcie-common.yaml#/definitions/reset-names
additionalProperties: true
diff --git a/Documentation/devicetree/bindings/pci/socionext,uniphier-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/socionext,uniphier-pcie-ep.yaml
index 1719a36952c0..8c2a8e8f96f9 100644
--- a/Documentation/devicetree/bindings/pci/socionext,uniphier-pcie-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/socionext,uniphier-pcie-ep.yaml
@@ -16,7 +16,8 @@ maintainers:
- Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
allOf:
- - $ref: /schemas/pci/snps,dw-pcie-ep.yaml#
+ - $ref: /schemas/pci/pci-ep.yaml#
+ - $ref: /schemas/pci/snps,dw-pcie-common.yaml#
properties:
compatible:
--
2.35.1
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