diff options
| author | Tony Han <tony.han@microchip.com> | 2025-12-03 15:11:43 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-01-01 14:45:16 +0300 |
| commit | d3824968dbd9056844bbd5041020a3e28c748558 (patch) | |
| tree | bf84aad8295dc74c504878532f55dc2c1670fce2 | |
| parent | c47422f4d0a26b25ff59709921eaaf8f916eec7d (diff) | |
| download | linux-d3824968dbd9056844bbd5041020a3e28c748558.tar.xz | |
dmaengine: at_xdmac: get the number of DMA channels from device tree
In case of kernel runs in non-secure mode, the number of DMA channels can
be got from device tree since the value read from GTYPE register is "0" as
it's always secured.
As the number of channels can never be negative, update them to the type
"unsigned".
This is required for LAN969x.
Signed-off-by: Tony Han <tony.han@microchip.com>
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://patch.msgid.link/20251203121208.1269487-1-robert.marko@sartura.hr
Signed-off-by: Vinod Koul <vkoul@kernel.org>
| -rw-r--r-- | drivers/dma/at_xdmac.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index ada96d490847..901971e8bae6 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -2247,12 +2247,29 @@ static int __maybe_unused atmel_xdmac_runtime_resume(struct device *dev) return clk_enable(atxdmac->clk); } +static inline int at_xdmac_get_channel_number(struct platform_device *pdev, + u32 reg, u32 *pchannels) +{ + int ret; + + if (reg) { + *pchannels = AT_XDMAC_NB_CH(reg); + return 0; + } + + ret = of_property_read_u32(pdev->dev.of_node, "dma-channels", pchannels); + if (ret) + dev_err(&pdev->dev, "can't get number of channels\n"); + + return ret; +} + static int at_xdmac_probe(struct platform_device *pdev) { struct at_xdmac *atxdmac; - int irq, nr_channels, i, ret; + int irq, ret; void __iomem *base; - u32 reg; + u32 nr_channels, i, reg; irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -2268,7 +2285,10 @@ static int at_xdmac_probe(struct platform_device *pdev) * of channels to do the allocation. */ reg = readl_relaxed(base + AT_XDMAC_GTYPE); - nr_channels = AT_XDMAC_NB_CH(reg); + ret = at_xdmac_get_channel_number(pdev, reg, &nr_channels); + if (ret) + return ret; + if (nr_channels > AT_XDMAC_MAX_CHAN) { dev_err(&pdev->dev, "invalid number of channels (%u)\n", nr_channels); |