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Tue, 14 Jul 2026 16:47:44 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: txx9dmac: use devm_platform_ioremap_resource() Date: Tue, 14 Jul 2026 16:47:42 -0700 Message-ID: <20260714234742.908956-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace the open-coded platform_get_resource() plus devm_request_mem_region= () and devm_ioremap() sequence with a single devm_platform_ioremap_resource() call, which folds the resource lookup, region reservation and mapping into one step and returns an ERR_PTR on failure, checked with IS_ERR() and propagated via PTR_ERR(). This is behaviorally equivalent: the driver already reserved the region with devm_request_mem_region(), so the non-overlapping reg requirement of devm_platform_ioremap_resource() was already satisfied. The txx9dmac platform device (arch/mips/txx9/generic/setup.c) provides a single IORESOURCE_MEM window per DMAC instance, and the child txx9dmac-chan devices carry only IRQ resources, so no region conflict is introduced. Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev --- drivers/dma/txx9dmac.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c index 05622b68a936..6595a54a4b97 100644 --- a/drivers/dma/txx9dmac.c +++ b/drivers/dma/txx9dmac.c @@ -1167,26 +1167,20 @@ static void txx9dmac_chan_remove(struct platform_de= vice *pdev) static int __init txx9dmac_probe(struct platform_device *pdev) { struct txx9dmac_platform_data *pdata =3D dev_get_platdata(&pdev->dev); - struct resource *io; struct txx9dmac_dev *ddev; + void __iomem *regs; u32 mcr; int err; =20 - io =3D platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!io) - return -EINVAL; + regs =3D devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(regs)) + return PTR_ERR(regs); =20 ddev =3D devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL); if (!ddev) return -ENOMEM; =20 - if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), - dev_name(&pdev->dev))) - return -EBUSY; - - ddev->regs =3D devm_ioremap(&pdev->dev, io->start, resource_size(io)); - if (!ddev->regs) - return -ENOMEM; + ddev->regs =3D regs; ddev->have_64bit_regs =3D pdata->have_64bit_regs; if (__is_dmac64(ddev)) ddev->descsize =3D sizeof(struct txx9dmac_hwdesc); --=20 2.55.0