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Message-Id: <20200512004919.40685-1-vadivel.muruganx.ramuthevar@linux.intel.com>
Date: Tue, 12 May 2020 08:49:19 +0800
From: "Ramuthevar,Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com>
To: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
robh+dt@...nel.org
Cc: vigneshr@...com, broonie@...nel.org, cheol.yong.kim@...el.com,
qi-ming.wu@...el.com,
Ramuthevar Vadivel Murugan
<vadivel.muruganx.ramuthevar@...ux.intel.com>
Subject: [PATCH v1] dt-bindings: spi: Add schema for Cadence QSPI Controller driver
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
Add dt-bindings documentation for Cadence-QSPI controller to support
spi based flash memories.
Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
---
.../devicetree/bindings/mtd/cadence-quadspi.txt | 67 -----------
.../devicetree/bindings/spi/cdns,qspi-nor.yaml | 127 +++++++++++++++++++++
2 files changed, 127 insertions(+), 67 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
create mode 100644 Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
deleted file mode 100644
index 945be7d5b236..000000000000
--- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
+++ /dev/null
@@ -1,67 +0,0 @@
-* Cadence Quad SPI controller
-
-Required properties:
-- compatible : should be one of the following:
- Generic default - "cdns,qspi-nor".
- For TI 66AK2G SoC - "ti,k2g-qspi", "cdns,qspi-nor".
- For TI AM654 SoC - "ti,am654-ospi", "cdns,qspi-nor".
-- reg : Contains two entries, each of which is a tuple consisting of a
- physical address and length. The first entry is the address and
- length of the controller register set. The second entry is the
- address and length of the QSPI Controller data area.
-- interrupts : Unit interrupt specifier for the controller interrupt.
-- clocks : phandle to the Quad SPI clock.
-- cdns,fifo-depth : Size of the data FIFO in words.
-- cdns,fifo-width : Bus width of the data FIFO in bytes.
-- cdns,trigger-address : 32-bit indirect AHB trigger address.
-
-Optional properties:
-- cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
-- cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch
- the read data rather than the QSPI clock. Make sure that QSPI return
- clock is populated on the board before using this property.
-
-Optional subnodes:
-Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
-custom properties:
-- cdns,read-delay : Delay for read capture logic, in clock cycles
-- cdns,tshsl-ns : Delay in nanoseconds for the length that the master
- mode chip select outputs are de-asserted between
- transactions.
-- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being
- de-activated and the activation of another.
-- cdns,tchsh-ns : Delay in nanoseconds between last bit of current
- transaction and deasserting the device chip select
- (qspi_n_ss_out).
-- cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low
- and first bit transfer.
-- resets : Must contain an entry for each entry in reset-names.
- See ../reset/reset.txt for details.
-- reset-names : Must include either "qspi" and/or "qspi-ocp".
-
-Example:
-
- qspi: spi@...05000 {
- compatible = "cdns,qspi-nor";
- #address-cells = <1>;
- #size-cells = <0>;
- reg = <0xff705000 0x1000>,
- <0xffa00000 0x1000>;
- interrupts = <0 151 4>;
- clocks = <&qspi_clk>;
- cdns,is-decoded-cs;
- cdns,fifo-depth = <128>;
- cdns,fifo-width = <4>;
- cdns,trigger-address = <0x00000000>;
- resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>;
- reset-names = "qspi", "qspi-ocp";
-
- flash0: n25q00@0 {
- ...
- cdns,read-delay = <4>;
- cdns,tshsl-ns = <50>;
- cdns,tsd2d-ns = <50>;
- cdns,tchsh-ns = <4>;
- cdns,tslch-ns = <4>;
- };
- };
diff --git a/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
new file mode 100644
index 000000000000..28112b38e6a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
@@ -0,0 +1,127 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/spi/cdns,qspi-nor.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Cadence QSPI Flash Controller support
+
+maintainers:
+ - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
+
+allOf:
+ - $ref: "spi-controller.yaml#"
+
+description: |
+ Binding Documentation for Cadence QSPI controller,This controller is
+ present in the Intel LGM, Altera SoCFPGA and TI SoCs and this driver
+ has been tested On Intel's LGM SoC.
+
+properties:
+ compatible:
+ enum:
+ - cdns,qspi-nor
+ - ti,k2g-qspi
+ - ti,am654-ospi
+ - intel,lgm-qspi
+
+ reg:
+ maxItems: 2
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ cdns,fifo-depth:
+ description:
+ Depth of hardware FIFOs.
+ allOf:
+ - $ref: "/schemas/types.yaml#/definitions/uint32"
+ - enum: [ 128, 256 ]
+ - default: 128
+
+ cdns,fifo-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ 4 byte bus width of the data FIFO in bytes.
+
+ cdns,trigger-address:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ 32-bit indirect AHB trigger address.
+
+ cdns,rclk-en:
+ type: boolean
+ description: |
+ Flag to indicate that QSPI return clock is used to latch the read data
+ rather than the QSPI clock. Make sure that QSPI return clock is populated
+ on the board before using this property.
+
+# subnode's properties
+patternProperties:
+ "^.*@[0-9a-fa-f]+$":
+ type: object
+ description:
+ flash device uses the subnodes below defined properties.
+
+ cdns,read-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay for read capture logic, in clock cycles.
+
+ cdns,tshsl-ns:
+ description: |
+ Delay in nanoseconds for the length that the master mode chip select
+ outputs are de-asserted between transactions.
+
+ cdns,tsd2d-ns:
+ description: |
+ Delay in nanoseconds between one chip select being de-activated
+ and the activation of another.
+
+ cdns,tchsh-ns:
+ description: |
+ Delay in nanoseconds between last bit of current transaction and
+ deasserting the device chip select (qspi_n_ss_out).
+
+ cdns,tslch-ns:
+ description: |
+ Delay in nanoseconds between setting qspi_n_ss_out low and
+ first bit transfer.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - cdns,fifo-depth
+ - cdns,fifo-width
+ - cdns,trigger-address
+
+examples:
+ - |
+ spi@...05000 {
+ compatible = "cdns,qspi-nor";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0xff705000 0x1000>,
+ <0xffa00000 0x1000>;
+ interrupts = <0 151 4>;
+ clocks = <&qspi_clk>;
+ cdns,fifo-depth = <128>;
+ cdns,fifo-width = <4>;
+ cdns,trigger-address = <0x00000000>;
+
+ flash@0 {
+ compatible = "jedec,spi-nor";
+ reg = <0x0>;
+ cdns,read-delay = <4>;
+ cdns,tshsl-ns = <50>;
+ cdns,tsd2d-ns = <50>;
+ cdns,tchsh-ns = <4>;
+ cdns,tslch-ns = <4>;
+ };
+ };
+
--
2.11.0
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