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Fri, 24 May 2024 11:27:52 -0700 (PDT) Received: from raspberrypi.com ([188.39.149.98]) by smtp-relay.gmail.com with ESMTPS id ffacd0b85a97d-3557a1cd354sm56646f8f.101.2024.05.24.11.27.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 11:27:52 -0700 (PDT) X-Relaying-Domain: raspberrypi.com From: Dave Stevenson To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Vinod Koul , Maxime Ripard , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Ulf Hansson , Mark Brown , Christoph Hellwig , Marek Szyprowski , Robin Murphy , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Vladimir Murzin , Phil Elwell , Stefan Wahren , Serge Semin Cc: devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mmc@vger.kernel.org, linux-spi@vger.kernel.org, iommu@lists.linux.dev, linux-sound@vger.kernel.org, Stefan Wahren , Dave Stevenson Subject: [PATCH 02/18] dmaengine: bcm2835: Support common dma-channel-mask Date: Fri, 24 May 2024 19:26:46 +0100 Message-Id: <20240524182702.1317935-3-dave.stevenson@raspberrypi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> References: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Stefan Wahren Nowadays there is a generic property for dma-channel-mask in the DMA controller binding. So prefer this one instead of the old vendor specific one. Print a warning in case the old one is used. Btw use the result of of_property_read_u32() as return code in error case. Signed-off-by: Stefan Wahren Signed-off-by: Dave Stevenson --- drivers/dma/bcm2835-dma.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 9d74fe97452e..528c4593b45a 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -941,12 +941,19 @@ static int bcm2835_dma_probe(struct platform_device *pdev) } /* Request DMA channel mask from device tree */ - if (of_property_read_u32(pdev->dev.of_node, - "brcm,dma-channel-mask", - &chans_available)) { - dev_err(&pdev->dev, "Failed to get channel mask\n"); - rc = -EINVAL; - goto err_no_dma; + rc = of_property_read_u32(pdev->dev.of_node, "dma-channel-mask", + &chans_available); + + if (rc) { + /* Try deprecated property */ + if (of_property_read_u32(pdev->dev.of_node, + "brcm,dma-channel-mask", + &chans_available)) { + dev_err(&pdev->dev, "Failed to get channel mask\n"); + goto err_no_dma; + } + + dev_warn(&pdev->dev, "brcm,dma-channel-mask deprecated - please update DT\n"); } /* get irqs for each channel that we support */ -- 2.34.1