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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5bcbbaf074
The Marvell PXA SSP block is the same or similiar to the MMP2 variant. The only difference in the binding is the PXA version supports DMA (and that's probably a binding difference rather than an actual h/w difference). The old binding didn't belong under 'serial' as it is not a UART. The SSP block also supports audio devices, so 'spi' is not a perfect fit either. As the existing schema for MMP2 is there, just leave things as-is. The examples in the old text binding were pretty out of sync with reality. 'clock-names' and 'ssp-id' aren't documented nor used. Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rob Herring (Arm) <robh@kernel.org> Link: https://msgid.link/r/20240522132859.3146335-1-robh@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
86 lines
1.6 KiB
YAML
86 lines
1.6 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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# Copyright 2019,2020 Lubomir Rintel <lkundrak@v3.sk>
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/spi/marvell,mmp2-ssp.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: PXA2xx SSP SPI Controller
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maintainers:
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- Lubomir Rintel <lkundrak@v3.sk>
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properties:
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compatible:
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enum:
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- marvell,mmp2-ssp
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- mrvl,ce4100-ssp
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- mvrl,pxa168-ssp
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- mrvl,pxa25x-ssp
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- mvrl,pxa25x-nssp
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- mrvl,pxa27x-ssp
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- mrvl,pxa3xx-ssp
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- mrvl,pxa910-ssp
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interrupts:
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maxItems: 1
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reg:
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maxItems: 1
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clocks:
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maxItems: 1
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dmas:
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items:
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- description: Receive DMA
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- description: Transmit DMA
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dma-names:
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items:
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- const: rx
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- const: tx
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ready-gpios:
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description: |
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GPIO used to signal a SPI master that the FIFO is filled and we're
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ready to service a transfer. Only useful in slave mode.
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maxItems: 1
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required:
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- compatible
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- reg
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- interrupts
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- clocks
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dependencies:
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ready-gpios: [ spi-slave ]
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allOf:
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- $ref: spi-controller.yaml#
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- if:
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properties:
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compatible:
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contains:
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const: marvell,mmp2-ssp
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then:
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properties:
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dmas: false
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dma-names: false
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/clock/marvell,mmp2.h>
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spi@d4035000 {
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compatible = "marvell,mmp2-ssp";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0xd4035000 0x1000>;
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clocks = <&soc_clocks MMP2_CLK_SSP0>;
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interrupts = <0>;
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};
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...
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