[PATCH v2 0/3] Determine the number of DMA channels by 'dma-channels' property

From: Zong Li
Date: Tue Jan 11 2022 - 03:51:42 EST


The PDMA driver currently assumes there are four channels by default, it
might cause the error if there is actually less than four channels.
Change that by getting number of channel dynamically from device tree.
For backwards-compatible, it uses the default value (i.e. 4) when there
is no 'dma-channels' information in dts.

This patch set contains the dts and dt-bindings change.

Changed in v2:
- Rebase on tag v5.16
- Use 4 as default value of dma-channels

Zong Li (3):
riscv: dts: Add dma-channels property in dma node
dt-bindings: Add dma-channels for pdma device node
dmaengine: sf-pdma: Get number of channel by device tree

.../bindings/dma/sifive,fu540-c000-pdma.yaml | 7 +++++++
arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi | 1 +
arch/riscv/boot/dts/sifive/fu540-c000.dtsi | 1 +
drivers/dma/sf-pdma/sf-pdma.c | 15 +++++++++------
drivers/dma/sf-pdma/sf-pdma.h | 8 ++------
5 files changed, 20 insertions(+), 12 deletions(-)

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2.31.1