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X-CSE-ConnectionGUID: S27Cw1e1Tz+1WaSPY8icCA== X-CSE-MsgGUID: 9ZCcXhaCSpOmI6Bq7flNQA== X-IronPort-AV: E=McAfee;i="6800,10657,11905"; a="90218031" X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="90218031" Received: from fmviesa012.fm.intel.com ([10.60.135.152]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2026 23:47:33 -0700 X-CSE-ConnectionGUID: G7IZiRvjTG+wDabJyYvZwQ== X-CSE-MsgGUID: apAPhVFURX+XHpRIfNXygw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="2435704" Received: from carterle-desk.ger.corp.intel.com (HELO localhost) ([10.245.245.170]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2026 23:47:27 -0700 Date: Fri, 18 Sep 2026 09:47:24 +0300 From: Andy Shevchenko To: Frank.Li@oss.nxp.com Cc: Eugen Hristev , Jonathan Cameron , David Lechner , Nuno =?iso-8859-1?Q?S=E1?= , Andy Shevchenko , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Maxime Coquelin , Alexandre Torgue , Daniel Lezcano , Felix Gu , Stepan Ionichev , Shuvam Pandey , Antoniu Miclaus , Frank Li , Piyush Patle , Uwe =?iso-8859-1?Q?Kleine-K=F6nig_=28The_Capable_Hub=29?= , Takashi Sakamoto , Giorgi Tchankvetadze , Olivier Moysan , "Rob Herring (Arm)" , Pei Xiao , Shi Hao , Kees Cook , Michael Hennerich , "open list:MICROCHIP SAMA5D2-COMPATIBLE ADC DRIVER" , "moderated list:ARM/Microchip (AT91) SoC support" , open list , "moderated list:ARM/STM32 ARCHITECTURE" , imx@lists.linux.dev, vkoul@kernel.org Subject: Re: [PATCH 1/1] iio: use dmaengine_get_dma_device() instead of chan->device->dev Message-ID: References: <20260917203652.1279059-1-Frank.Li@oss.nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260917203652.1279059-1-Frank.Li@oss.nxp.com> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260917_234734_899255_E8EEEF3D X-CRM114-Status: GOOD ( 12.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 17, 2026 at 04:36:26PM -0400, Frank.Li@oss.nxp.com wrote: > Replace direct dma_chan::device::dev access with the proper > dmaengine_get_dma_device() accessor in IIO DMA consumers. > > chan->device->dev is not always the device used for DMA mapping. > Some DMA engines support per-channel IOMMU mappings, so different > channels may use different DMA devices. dmaengine_get_dma_device() > returns the correct device for each channel. > > This also prepares for making the DMA engine provider data structures > private. DMA consumers should not access DMA engine internals directly. ... > drivers/iio/adc/at91-sama5d2_adc.c | 9 ++++++--- > drivers/iio/adc/nxp-sar-adc.c | 2 +- > drivers/iio/adc/stm32-adc.c | 10 ++++++---- > drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++-- > drivers/iio/adc/ti_am335x_adc.c | 4 ++-- > drivers/iio/buffer/industrialio-buffer-dmaengine.c | 5 +++-- Strictly speaking this is two patches, one per ADC folder and the other against IIO core. But this one is not a big one, so up to Jonathan. Reviewed-by: Andy Shevchenko -- With Best Regards, Andy Shevchenko