41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
From 0dcafa8ab800d1f534bb0cb51cd02a082cf34be6 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 30 Apr 2020 12:43:05 +0100
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Subject: [PATCH] ARM: dts: bcm2711: Allow 40-bit DMA for SPI
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Add the spi_dma4 DT parameter to enable use of the 40-bit DMA channels
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to drive SPI. Note that there are only 3-4 40-bit channels available,
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and using this parameter claims 2 of them.
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Usage: dtparam=spi_dma4
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++
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arch/arm/boot/dts/overlays/README | 4 ++++
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2 files changed, 6 insertions(+)
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--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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@@ -554,5 +554,7 @@
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eth_led0 = <&phy1>,"led-modes:0";
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eth_led1 = <&phy1>,"led-modes:4";
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+ spi_dma4 = <&spi0>, "dmas:0=", <&dma40>,
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+ <&spi0>, "dmas:8=", <&dma40>;
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};
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};
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -159,6 +159,10 @@ Params:
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spi Set to "on" to enable the spi interfaces
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(default "off")
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+ spi_dma4 Use to enable 40-bit DMA on spi interfaces
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+ (the assigned value doesn't matter)
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+ (2711 only)
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+
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random Set to "on" to enable the hardware random
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number generator (default "on")
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