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Message-Id: <20200219022852.28065-2-vadivel.muruganx.ramuthevar@linux.intel.com>
Date: Wed, 19 Feb 2020 10:28:51 +0800
From: "Ramuthevar,Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com>
To: linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
broonie@...nel.org, vigneshr@...com
Cc: robh+dt@...nel.org, simon.k.r.goldschmidt@...il.com,
dinguyen@...nel.org, tien.fong.chee@...el.com, marex@...x.de,
cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
Ramuthevar Vadivel Murugan
<vadivel.muruganx.ramuthevar@...ux.intel.com>
Subject: [PATCH v10 1/2] 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/spi/cdns,qspi-nor.yaml | 147 +++++++++++++++++++++
1 file changed, 147 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
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..1a4d6e8d0d0b
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
@@ -0,0 +1,147 @@
+# 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.
+
+ - 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".
+ For Intel LGM SoC - "intel,lgm-qspi", "cdns,qspi-nor".
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - ti,k2g-qspi
+ - const: cdns,qspi-nor
+
+ - items:
+ - enum:
+ - ti,am654-ospi
+ - const: cdns,qspi-nor
+
+ - items:
+ - enum:
+ - intel,lgm-qspi
+ - const: cdns,qspi-nor
+
+ - items:
+ - const: cdns,qspi-nor
+
+ reg:
+ maxItems: 2
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ cdns,fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Size of the data FIFO in words.
+
+ cdns,fifo-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ 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:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Flag to indicate that QSPI return clock is used to latch the read data
+ rather than the QSPI clock. Make sure that QSPI return clock is populated
+ on the board before using this property.
+
+# subnode's properties
+patternProperties:
+ "^.*@[0-9a-fA-F]+$":
+ 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:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds for the length that the master mode chip select
+ outputs are de-asserted between transactions.
+
+ cdns,tsd2d-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds between one chip select being de-activated
+ and the activation of another.
+
+ cdns,tchsh-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds between last bit of current transaction and
+ deasserting the device chip select (qspi_n_ss_out).
+
+ cdns,tslch-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ 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:
+ - |
+ 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,fifo-depth = <128>;
+ cdns,fifo-width = <4>;
+ cdns,trigger-address = <0x00000000>;
+
+ flash0: n25q00@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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