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Message-Id: <20250602141246.941448-1-Frank.Li@nxp.com>
Date: Mon, 2 Jun 2025 10:12:45 -0400
From: Frank Li <Frank.Li@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
Rob Herring <robh@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
linux-kernel@...r.kernel.org (open list:MEMORY CONTROLLER DRIVERS),
devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
Cc: imx@...ts.linux.dev
Subject: [PATCH 1/1] dt-bindings: memory-controllers: convert arm,pl172.txt to yaml format
Convert arm,pl172.txt to yaml format.
Additional changes:
- add mpmc,read-enable-delay property.
- allow gpio@...r and sram@...r as child node to match existed dts.
Signed-off-by: Frank Li <Frank.Li@....com>
---
.../bindings/memory-controllers/arm,pl172.txt | 127 ----------
.../memory-controllers/arm,pl172.yaml | 222 ++++++++++++++++++
2 files changed, 222 insertions(+), 127 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/memory-controllers/arm,pl172.txt
create mode 100644 Documentation/devicetree/bindings/memory-controllers/arm,pl172.yaml
diff --git a/Documentation/devicetree/bindings/memory-controllers/arm,pl172.txt b/Documentation/devicetree/bindings/memory-controllers/arm,pl172.txt
deleted file mode 100644
index 22b77ee02f583..0000000000000
--- a/Documentation/devicetree/bindings/memory-controllers/arm,pl172.txt
+++ /dev/null
@@ -1,127 +0,0 @@
-* Device tree bindings for ARM PL172/PL175/PL176 MultiPort Memory Controller
-
-Required properties:
-
-- compatible: Must be "arm,primecell" and exactly one from
- "arm,pl172", "arm,pl175" or "arm,pl176".
-
-- reg: Must contains offset/length value for controller.
-
-- #address-cells: Must be 2. The partition number has to be encoded in the
- first address cell and it may accept values 0..N-1
- (N - total number of partitions). The second cell is the
- offset into the partition.
-
-- #size-cells: Must be set to 1.
-
-- ranges: Must contain one or more chip select memory regions.
-
-- clocks: Must contain references to controller clocks.
-
-- clock-names: Must contain "mpmcclk" and "apb_pclk".
-
-- clock-ranges: Empty property indicating that child nodes can inherit
- named clocks. Required only if clock tree data present
- in device tree.
- See clock-bindings.txt
-
-Child chip-select (cs) nodes contain the memory devices nodes connected to
-such as NOR (e.g. cfi-flash) and NAND.
-
-Required child cs node properties:
-
-- #address-cells: Must be 2.
-
-- #size-cells: Must be 1.
-
-- ranges: Empty property indicating that child nodes can inherit
- memory layout.
-
-- clock-ranges: Empty property indicating that child nodes can inherit
- named clocks. Required only if clock tree data present
- in device tree.
-
-- mpmc,cs: Chip select number. Indicates to the pl0172 driver
- which chipselect is used for accessing the memory.
-
-- mpmc,memory-width: Width of the chip select memory. Must be equal to
- either 8, 16 or 32.
-
-Optional child cs node config properties:
-
-- mpmc,async-page-mode: Enable asynchronous page mode.
-
-- mpmc,cs-active-high: Set chip select polarity to active high.
-
-- mpmc,byte-lane-low: Set byte lane state to low.
-
-- mpmc,extended-wait: Enable extended wait.
-
-- mpmc,buffer-enable: Enable write buffer, option is not supported by
- PL175 and PL176 controllers.
-
-- mpmc,write-protect: Enable write protect.
-
-Optional child cs node timing properties:
-
-- mpmc,write-enable-delay: Delay from chip select assertion to write
- enable (WE signal) in nano seconds.
-
-- mpmc,output-enable-delay: Delay from chip select assertion to output
- enable (OE signal) in nano seconds.
-
-- mpmc,write-access-delay: Delay from chip select assertion to write
- access in nano seconds.
-
-- mpmc,read-access-delay: Delay from chip select assertion to read
- access in nano seconds.
-
-- mpmc,page-mode-read-delay: Delay for asynchronous page mode sequential
- accesses in nano seconds.
-
-- mpmc,turn-round-delay: Delay between access to memory banks in nano
- seconds.
-
-If any of the above timing parameters are absent, current parameter value will
-be taken from the corresponding HW reg.
-
-Example for pl172 with nor flash on chip select 0 shown below.
-
-emc: memory-controller@...05000 {
- compatible = "arm,pl172", "arm,primecell";
- reg = <0x40005000 0x1000>;
- clocks = <&ccu1 CLK_CPU_EMCDIV>, <&ccu1 CLK_CPU_EMC>;
- clock-names = "mpmcclk", "apb_pclk";
- #address-cells = <2>;
- #size-cells = <1>;
- ranges = <0 0 0x1c000000 0x1000000
- 1 0 0x1d000000 0x1000000
- 2 0 0x1e000000 0x1000000
- 3 0 0x1f000000 0x1000000>;
-
- cs0 {
- #address-cells = <2>;
- #size-cells = <1>;
- ranges;
-
- mpmc,cs = <0>;
- mpmc,memory-width = <16>;
- mpmc,byte-lane-low;
- mpmc,write-enable-delay = <0>;
- mpmc,output-enable-delay = <0>;
- mpmc,read-enable-delay = <70>;
- mpmc,page-mode-read-delay = <70>;
-
- flash@0,0 {
- compatible = "sst,sst39vf320", "cfi-flash";
- reg = <0 0 0x400000>;
- bank-width = <2>;
- #address-cells = <1>;
- #size-cells = <1>;
- partition@0 {
- label = "data";
- reg = <0 0x400000>;
- };
- };
- };
-};
diff --git a/Documentation/devicetree/bindings/memory-controllers/arm,pl172.yaml b/Documentation/devicetree/bindings/memory-controllers/arm,pl172.yaml
new file mode 100644
index 0000000000000..c1b702669bd9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/arm,pl172.yaml
@@ -0,0 +1,222 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/arm,pl172.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM PL172/PL175/PL176 MultiPort Memory Controller
+
+maintainers:
+ - Frank Li <Frank.Li@....com>
+
+# We need a select here so we don't match all nodes with 'arm,primecell'
+select:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - arm,pl172
+ - arm,pl175
+ - arm,pl176
+ required:
+ - compatible
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - arm,pl172
+ - arm,pl175
+ - arm,pl176
+ - const: arm,primecell
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 2
+
+ '#size-cells':
+ const: 1
+
+ ranges: true
+
+ clocks:
+ maxItems: 2
+
+ clock-names:
+ items:
+ - const: mpmcclk
+ - const: apb_pclk
+
+ clock-ranges: true
+
+ resets:
+ maxItems: 1
+
+patternProperties:
+ "^cs[0-9]$":
+ type: object
+ additionalProperties: false
+ patternProperties:
+ "^flash@[0-9],[0-9a-f]+$":
+ type: object
+ $ref: /schemas/mtd/mtd-physmap.yaml#
+ unevaluatedProperties: false
+
+ "^(gpio|sram)@[0-9],[0-9a-f]+$":
+ type: object
+ additionalProperties: true
+
+ properties:
+ '#address-cells':
+ const: 2
+
+ '#size-cells':
+ const: 1
+
+ ranges: true
+
+ clocks:
+ maxItems: 2
+
+ clock-ranges: true
+
+ mpmc,cs:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Chip select number. Indicates to the pl0172 driver
+ which chipselect is used for accessing the memory.
+
+ mpmc,memory-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [8, 16, 32]
+ description:
+ Width of the chip select memory. Must be equal to either 8, 16 or 32.
+
+ mpmc,async-page-mode:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Enable asynchronous page mode.
+
+ mpmc,cs-active-high:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Set chip select polarity to active high.
+
+ mpmc,byte-lane-low:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Set byte lane state to low.
+
+ mpmc,extended-wait:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Enable extended wait.
+
+ mpmc,buffer-enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Enable write buffer, option is not supported by
+ PL175 and PL176 controllers.
+
+ mpmc,write-protect:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Enable write protect.
+
+ mpmc,read-enable-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay from chip select assertion to read
+ enable (RE signal) in nano seconds.
+
+ mpmc,write-enable-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay from chip select assertion to write
+ enable (WE signal) in nano seconds.
+
+ mpmc,output-enable-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay from chip select assertion to output
+ enable (OE signal) in nano seconds.
+
+ mpmc,write-access-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay from chip select assertion to write
+ access in nano seconds.
+
+ mpmc,read-access-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay from chip select assertion to read
+ access in nano seconds.
+
+ mpmc,page-mode-read-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay for asynchronous page mode sequential
+ accesses in nano seconds.
+
+ mpmc,turn-round-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay between access to memory banks in nano
+ seconds.
+
+required:
+ - compatible
+ - reg
+ - '#address-cells'
+ - '#size-cells'
+ - ranges
+ - clocks
+ - clock-names
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/lpc18xx-ccu.h>
+
+ memory-controller@...05000 {
+ compatible = "arm,pl172", "arm,primecell";
+ reg = <0x40005000 0x1000>;
+ clocks = <&ccu1 CLK_CPU_EMCDIV>, <&ccu1 CLK_CPU_EMC>;
+ clock-names = "mpmcclk", "apb_pclk";
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges = <0 0 0x1c000000 0x1000000
+ 1 0 0x1d000000 0x1000000
+ 2 0 0x1e000000 0x1000000
+ 3 0 0x1f000000 0x1000000>;
+
+ cs0 {
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges;
+
+ mpmc,cs = <0>;
+ mpmc,memory-width = <16>;
+ mpmc,byte-lane-low;
+ mpmc,write-enable-delay = <0>;
+ mpmc,output-enable-delay = <0>;
+ mpmc,read-enable-delay = <70>;
+ mpmc,page-mode-read-delay = <70>;
+
+ flash@0,0 {
+ compatible = "sst,sst39vf320", "cfi-flash";
+ reg = <0 0 0x400000>;
+ bank-width = <2>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ partition@0 {
+ label = "data";
+ reg = <0 0x400000>;
+ };
+ };
+ };
+ };
--
2.34.1
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