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Wed, 04 Nov 2026 07:47:00 -0800 (PST) Received: from d.home.yangfl.dn42 ([2a09:bac1:7680:28::4:396]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cdb4694a0e0sm1372632a12.20.2026.11.04.07.46.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 07:46:58 -0800 (PST) From: David Yang To: dmaengine@vger.kernel.org Cc: David Yang , Vinod Koul , Frank Li , Philipp Zabel , linux-kernel@vger.kernel.org Subject: [PATCH 2/2] dmaengine: pl08x: Use the channel count from the device tree Date: Wed, 4 Nov 2026 23:45:39 +0800 Message-ID: <20261104154542.3131916-3-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261104154542.3131916-1-mmyangfl@gmail.com> References: <20261104154542.3131916-1-mmyangfl@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Hi3798MV100 DMAC is a plain PL080 except for the channel count: 4 instead of 8. The part ID does not say, and the driver takes the count from the matched vendor_data entry. dma-common.yaml already defines dma-channels for a controller node. Honor it. Signed-off-by: David Yang --- drivers/dma/amba-pl08x.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 33ad6c42cd7f..9bcb4a3cd5a0 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -2698,6 +2698,7 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) struct device_node *np = adev->dev.of_node; struct reset_control *rst; u32 tsfr_size; + u32 channels; int ret = 0; int i; @@ -2759,6 +2760,16 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) vd->dualmaster = !!(val & BIT(9)); } + /* Read the channel number from the node if specified */ + if (!of_property_read_u32(np, "dma-channels", &channels) && channels) { + if (channels > vd->channels) + dev_warn(&adev->dev, + "using %u channels, instead of %u from the node\n", + vd->channels, channels); + else + vd->channels = channels; + } + /* Initialize memcpy engine */ dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); pl08x->memcpy.dev = &adev->dev; -- 2.53.0