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dt-bindings: convert mtk-quadspi binding doc for spi-mtk-nor

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spi-mtk-nor is a driver to replace mtk-quadspi and they have almost
the same device-tree bindings. Reuse this binding documentation and
convert it for new driver:

1. "Mediatek SoCs" -> "Mediatek ARM SoCs" because MTK MIPS SoCs
   use different controllers.
2. document "interrupts" as a required property because it's
   available on all SoCs with this controller and new driver takes
   advantages of it. It's implemented as optional only to maintain
   backward compatibility.
3. add a dummy interrupt binding in example.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Link: https://lore.kernel.org/r/20200306085052.28258-4-gch981213@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chuanhong Guo 2020-03-06 16:50:51 +08:00 committed by Mark Brown
parent 881d1ee9fe
commit 13a971046a
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1 changed files with 6 additions and 9 deletions
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15
Documentation/devicetree/bindings/mtd/mtk-quadspi.txt → Documentation/devicetree/bindings/spi/spi-mtk-nor.txt
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@ -1,4 +1,4 @@
* Serial NOR flash controller for MediaTek SoCs
* Serial NOR flash controller for MediaTek ARM SoCs
Required properties:
- compatible: For mt8173, compatible should be "mediatek,mt8173-nor",
@ -13,6 +13,7 @@ Required properties:
"mediatek,mt7629-nor", "mediatek,mt8173-nor"
"mediatek,mt8173-nor"
- reg: physical base address and length of the controller's register
- interrupts: Interrupt number used by the controller.
- clocks: the phandle of the clocks needed by the nor controller
- clock-names: the names of the clocks
the clocks should be named "spi" and "sf". "spi" is used for spi bus,
@ -22,20 +23,16 @@ Required properties:
- #address-cells: should be <1>
- #size-cells: should be <0>
The SPI flash must be a child of the nor_flash node and must have a
compatible property. Also see jedec,spi-nor.txt.
Required properties:
- compatible: May include a device-specific string consisting of the manufacturer
and name of the chip. Must also include "jedec,spi-nor" for any
SPI NOR flash that can be identified by the JEDEC READ ID opcode (0x9F).
- reg : Chip-Select number
There should be only one spi slave device following generic spi bindings.
It's not recommended to use this controller for devices other than SPI NOR
flash due to limited transfer capability of this controller.
Example:
nor_flash: spi@1100d000 {
compatible = "mediatek,mt8173-nor";
reg = <0 0x1100d000 0 0xe0>;
interrupts = <&spi_flash_irq>;
clocks = <&pericfg CLK_PERI_SPI>,
<&topckgen CLK_TOP_SPINFI_IFR_SEL>;
clock-names = "spi", "sf";