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Wed, 14 Oct 2020 00:38:33 -0700 (PDT) MIME-Version: 1.0 References: <20201013060623.1711-1-thunder.leizhen@huawei.com> <20201013060623.1711-2-thunder.leizhen@huawei.com> In-Reply-To: From: Arnd Bergmann Date: Wed, 14 Oct 2020 09:38:18 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/2] arm64: dts: broadcom: remove an unused property dma-ranges To: Florian Fainelli X-Provags-ID: V03:K1:xoyatiBcPFZvk3AuCFl5ojT7WEwmI5sKeeWup7MJ+aMG9gqyu95 ltjg7r2fGp5WT/Ru6ViukN7pXUtvzM36J0tNM7tMgFsu9kca/FXO/E0UVJZ8B7YyYs5r+OU LIbHDEB2xLzx/hHzVVK2x8IdjNypokn1pAWzolHGDTy787HTqvACIpW3K+orEOVWT8gaHPk VnjOUmFkvo/H37mmkhuEw== X-UI-Out-Filterresults: notjunk:1;V03:K0:kPKW7Tchq3k=:na9eh9Ux0fqrQ+83FkakZn fn8nE21ty43+HP0mPUpIEYEhIKtWv23noV4eHEfk14DaDSk/E3s5egCBVy0b7IQSeXCnmHCiG HaTNtsF/+V3GzTZyhB6RlpV+MY3+1uhhcULb483lTr0uLWDpPQqiIZRKbvNYZFUjwWYlXYrHD tVEPZFEahHs5FfXyB611hoEjTVmogVoVocMp7BtCB9Iref8/bqHZegSvZIuNTqewJBeV4QBh6 bNDJfyN75JGizQJWlgVyDyV08gDW5hAA1m+tqejhv5sv3xHEvmWIiCQDA0dVz4jvH3r4n73lv 81MLQiO2QMj0kJa5sSBah6GEPqmqw3BmCoMfrwZXW1VRYyJsD7EYbdMBS7CI/xVlLajDQ7qiE msET1ie9t7O2fGoVlFepMyGpa5npk4MhiKE4r+jhaWUeQfPxn0ztYwLmQ+J9UgFL5a1Rj98R7 DIt0bBmMSrbvarL+zjaQRrvh4u0hhM/O+gdK7ppbB+6ol/E404mG7qiysMEc9y/KRs3Jzxbiq QxB2ze4ICmngUFsqFgYmgdWNZzJ/w/t5eiDZuqAd06AvvxWsVWWlFrYE3nIOVoIvaUCWz1U7y Wi7tS/kOi7zXMboiFjkASbvOqwyOBzOLCmHuf2eSiCQ2gou5FPsZIT6idXdniwpy90nAdZ9l+ xfW9cSQHreCgh/UBfsdQBC1GKoOgDAMy8DEjI8em0w4kAdZ/omM0al+7ufhNXyTG1jMaX7q3h ohaCSAnsd/4x4Sk4bWoz8FO8OSW6pv3/CQBtb9RQZZfPcaA6ez+DF/oMf9DgLCNixeBGPWDzI BIo9EyP4Tg+ILY//ZCq6afV0CZGOaFBm//R7Z66Y5X1eUUUD/ICDVhZzgthBt1U6SurVNuR/3 poBYVAi0Pgy5uqZxmiYncnxyjUqIKzhFEXvbMO2m0n/dG5desCwwsUjBRQJhy7LyD8XDtBW3B BbZ7dW10mkpJkPnsamSwLE4Kf1kPgT4IlCWdNTgZ5fLvZwgRzrEwf X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201014_033839_016047_AF1522DE X-CRM114-Status: GOOD ( 20.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree , linux-kernel , Scott Branden , Ray Jui , linux-arm-msm , Andy Gross , Bjorn Andersson , Rob Herring , bcm-kernel-feedback-list , Zhen Lei , linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Oct 14, 2020 at 5:15 AM Florian Fainelli wrote: > On 10/12/2020 11:06 PM, Zhen Lei wrote: > > stingray-usb.dtsi is finally included by three dts files: > > bcm958802a802x.dts, bcm958742k.dts and bcm958742t.dts. I searched all > > these three entire expanded dts files, and each of them contains only one > > dma-ranges. No conversion range is specified, so it cannot work properly. > > I think this property "dma-ranges" is added by mistake, just remove it. > > Otherwise, the following error will be reported when any YAML detection > > is performed on arm64. > > > > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning \ > > (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but \ > > its #address-cells (1) differs from / (2) > > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning \ > > (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but \ > > its #size-cells (1) differs from / (2) > > > > Signed-off-by: Zhen Lei > > This looks fine to me, Scott, Ray do you want to Ack this patch before I > take it? Does it mean that there are no devices on this bus that can do DMA? Usually there should be a dma-ranges property to identify that DMA is possible and what the limits are, though we have failed to enforce that. Also note that the #address-cells=<1> means that any device under this bus is assumed to only support 32-bit addressing, and DMA will have to go through a slow swiotlb in the absence of an IOMMU. Arnd _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel