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Date: Mon, 23 Mar 2020 15:58:41 +0100
From: Christophe Kerello <christophe.kerello@...com>
To: <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
<lee.jones@...aro.org>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <tony@...mide.com>
CC: <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>, <marex@...x.de>,
Christophe Kerello <christophe.kerello@...com>
Subject: [01/12] dt-bindings: mfd: stm32-fmc2: add STM32 FMC2 controller documentation
This patch adds the documentation of the device tree bindings for the STM32
FMC2 controller.
Signed-off-by: Christophe Kerello <christophe.kerello@...com>
---
.../devicetree/bindings/mfd/st,stm32-fmc2.yaml | 370 +++++++++++++++++++++
1 file changed, 370 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/st,stm32-fmc2.yaml
diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-fmc2.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-fmc2.yaml
new file mode 100644
index 0000000..0ce1340
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/st,stm32-fmc2.yaml
@@ -0,0 +1,370 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/st,stm32-fmc2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics Flexible Memory Controller 2 (FMC2) Bindings
+
+description: |
+ The FMC2 functional block makes the interface with: synchronous and
+ asynchronous static devices (such as PSNOR, PSRAM or other memory-mapped
+ peripherals) and NAND flash memories.
+ Its main purposes are:
+ - to translate AXI transactions into the appropriate external device
+ protocol
+ - to meet the access time requirements of the external devices
+ All external devices share the addresses, data and control signals with the
+ controller. Each external device is accessed by means of a unique Chip
+ Select. The FMC2 performs only one access at a time to an external device.
+
+maintainers:
+ - Christophe Kerello <christophe.kerello@...com>
+
+properties:
+ compatible:
+ const: st,stm32mp1-fmc2
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 1
+
+ ranges: true
+
+patternProperties:
+ "^ebi(@.*)?":
+ type: object
+
+ properties:
+ compatible:
+ const: st,stm32mp1-fmc2-ebi
+
+ "#address-cells":
+ const: 2
+
+ "#size-cells":
+ const: 1
+
+ ranges: true
+
+ patternProperties:
+ "^[a-zA-Z]*-ebi@[a-f0-9,]*$":
+ type: object
+
+ properties:
+ reg:
+ maxItems: 1
+
+ st,fmc2_ebi_cs_transaction_type:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 11
+ description: |
+ Select one of the transactions type supported
+ 0: Asynchronous mode 1 SRAM/FRAM
+ 1: Asynchronous mode 1 PSRAM.
+ 2: Asynchronous mode A SRAM/FRAM.
+ 3: Asynchronous mode A PSRAM.
+ 4: Asynchronous mode 2 NOR.
+ 5: Asynchronous mode B NOR.
+ 6: Asynchronous mode C NOR.
+ 7: Asynchronous mode D NOR.
+ 8: Synchronous read synchronous write PSRAM.
+ 9: Synchronous read asynchronous write PSRAM.
+ 10: Synchronous read synchronous write NOR.
+ 11: Synchronous read asynchronous write NOR.
+
+ st,fmc2_ebi_cs_cclk_enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: Continuous clock enable (first bank must be configured
+ in synchronous mode). The FMC_CLK is generated continuously
+ during asynchronous and synchronous access. By default, the
+ FMC_CLK is only generated during synchronous access.
+
+ st,fmc2_ebi_cs_mux_enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: Address/Data multiplexed on databus (valid only with
+ NOR and PSRAM transactions type). By default, Address/Data are
+ not multiplexed.
+
+ st,fmc2_ebi_cs_buswidth:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [ 8, 16 ]
+ - default: 16
+ description: Data bus width
+
+ st,fmc2_ebi_cs_waitpol_high:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: Wait signal polarity (NWAIT signal active high).
+ By default, NWAIT is active low.
+
+ st,fmc2_ebi_cs_waitcfg_enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: The NWAIT signal indicates wheither the data from the
+ device are valid or if a wait state must be inserted when
+ accessing the device in synchronous mode. By default, the NWAIT
+ signal is active one data cycle before wait state.
+
+ st,fmc2_ebi_cs_wait_enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: The NWAIT signal is enabled (its level is taken into
+ account after the programmed latency period to insert wait states
+ if asserted). By default, the NWAIT signal is disabled.
+
+ st,fmc2_ebi_cs_asyncwait_enable:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: The NWAIT signal is taken into account during
+ asynchronous transactions. By default, the NWAIT signal is not
+ taken into account during asynchronous transactions.
+
+ st,fmc2_ebi_cs_cpsize:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [ 0, 128, 256, 512, 1024 ]
+ - default: 0
+ description: CRAM page size. The controller splits the burst access
+ when the memory page is reached. By default, no burst split when
+ crossing page boundary.
+
+ st,fmc2_ebi_cs_byte_lane_setup:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property configures the byte lane setup timing
+ defined in ns from NBLx low to Chip Select NEx low.
+
+ st,fmc2_ebi_cs_address_setup:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the address
+ setup phase in ns used for asynchronous read/write transactions.
+
+ st,fmc2_ebi_cs_address_hold:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the address
+ hold phase in ns used for asynchronous multiplexed
+ read/write transactions.
+
+ st,fmc2_ebi_cs_data_setup:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the data
+ setup phase in ns used for asynchronous read/write transactions.
+
+ st,fmc2_ebi_cs_bus_turnaround:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the delay between the end of
+ current read/write transaction and the next transaction.
+
+ st,fmc2_ebi_cs_data_hold:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the data
+ hold phase in ns used for asynchronous read/write transactions.
+
+ st,fmc2_ebi_cs_clk_period:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the FMC_CLK output signal period in ns.
+
+ st,fmc2_ebi_cs_data_latency:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the data latency before reading or writing
+ the first data. This timing is expressed in FMC_CLK periods.
+
+ st,fmc2_ebi_cs_write_address_setup:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the address
+ setup phase in ns used for asynchronous write transactions.
+
+ st,fmc2_ebi_cs_write_address_hold:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the address hold phase in
+ ns used for asynchronous multiplexed write transactions.
+
+ st,fmc2_ebi_cs_write_data_setup:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the data setup phase in
+ ns used for asynchronous write transactions.
+
+ st,fmc2_ebi_cs_write_bus_turnaround:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the delay between the end of current
+ write transaction and the next transaction.
+
+ st,fmc2_ebi_cs_write_data_hold:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the duration of the data hold phase
+ in ns used for asynchronous write transactions.
+
+ st,fmc2_ebi_cs_max_low_pulse:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description: This property defines the maximum chip select low pulse duration
+ in ns for synchronous transactions. When this timing reaches 0,
+ the controller splits the current access, toggles NE to allow
+ device refresh and restarts a new access.
+
+ required:
+ - reg
+ - st,fmc2_ebi_cs_transaction_type
+
+ additionalProperties: false
+
+ required:
+ - compatible
+ - "#address-cells"
+ - "#size-cells"
+ - ranges
+
+ nand-controller:
+ allOf:
+ - $ref: "../mtd/nand-controller.yaml#"
+
+ type: object
+
+ properties:
+ compatible:
+ const: st,stm32mp1-fmc2-nand
+
+ reg:
+ items:
+ - description: Chip select 0 data
+ - description: Chip select 0 command
+ - description: Chip select 0 address space
+ - description: Chip select 1 data
+ - description: Chip select 1 command
+ - description: Chip select 1 address space
+
+ interrupts:
+ maxItems: 1
+
+ dmas:
+ items:
+ - description: tx DMA channel
+ - description: rx DMA channel
+ - description: ecc DMA channel
+
+ dma-names:
+ items:
+ - const: tx
+ - const: rx
+ - const: ecc
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ patternProperties:
+ "^nand@[a-f0-9]$":
+ type: object
+
+ properties:
+ nand-ecc-step-size:
+ const: 512
+
+ nand-ecc-strength:
+ enum: [1, 4 ,8 ]
+
+ additionalProperties: false
+
+ required:
+ - "#address-cells"
+ - "#size-cells"
+ - compatible
+ - reg
+ - interrupts
+
+ additionalProperties: false
+
+required:
+ - "#address-cells"
+ - "#size-cells"
+ - compatible
+ - reg
+ - clocks
+ - ranges
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/clock/stm32mp1-clks.h>
+ #include <dt-bindings/reset/stm32mp1-resets.h>
+ fmc@...02000 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "st,stm32mp1-fmc2";
+ reg = <0x58002000 0x1000>;
+ clocks = <&rcc FMC_K>;
+ resets = <&rcc FMC_R>;
+ ranges;
+
+ ebi@0 {
+ #address-cells = <2>;
+ #size-cells = <1>;
+ compatible = "st,stm32mp1-fmc2-ebi";
+ ranges = <0 0 0x60000000 0x4000000>,
+ <1 0 0x64000000 0x4000000>,
+ <2 0 0x68000000 0x4000000>,
+ <3 0 0x6c000000 0x4000000>;
+
+ psram-ebi@0,0 {
+ compatible = "mtd-ram";
+ reg = <0 0x00000000 0x100000>;
+ bank-width = <2>;
+
+ st,fmc2_ebi_cs_transaction_type = <1>;
+ st,fmc2_ebi_cs_address_setup = <60>;
+ st,fmc2_ebi_cs_data_setup = <30>;
+ st,fmc2_ebi_cs_bus_turnaround = <5>;
+ };
+ };
+
+ nand-controller@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "st,stm32mp1-fmc2-nand";
+ reg = <0x80000000 0x1000>,
+ <0x88010000 0x1000>,
+ <0x88020000 0x1000>,
+ <0x81000000 0x1000>,
+ <0x89010000 0x1000>,
+ <0x89020000 0x1000>;
+ interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
+ dmas = <&mdma1 20 0x2 0x12000a02 0x0 0x0>,
+ <&mdma1 20 0x2 0x12000a08 0x0 0x0>,
+ <&mdma1 21 0x2 0x12000a0a 0x0 0x0>;
+ dma-names = "tx", "rx", "ecc";
+
+ nand@0 {
+ reg = <0>;
+ nand-on-flash-bbt;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ };
+ };
+ };
+
+...
--
1.9.1
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