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Mon, 08 Jun 2020 01:30:46 -0700 (PDT) From: dillon.minfei@gmail.com To: robh+dt@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux@armlinux.org.uk, vladimir.murzin@arm.com, kstewart@linuxfoundation.org, allison@lohutok.net, info@metux.net, tglx@linutronix.de Subject: [PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap Date: Mon, 8 Jun 2020 16:30:37 +0800 Message-Id: <1591605038-8682-2-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1591605038-8682-1-git-send-email-dillon.minfei@gmail.com> References: <1591605038-8682-1-git-send-email-dillon.minfei@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200608_013047_506587_5B2EA2D3 X-CRM114-Status: GOOD ( 11.03 ) 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@vger.kernel.org, dillon min , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: dillon min To mmap a framebuffer or v4l2 buffer from kernel to userspace on no-mmu platform, we need rely on 'arm_nommu_dma_ops' from arch/arm/mm/dma-mapping-nommu.c , so setup 4M bytes memory reserved for this purpose. Signed-off-by: dillon min --- arch/arm/boot/dts/stm32f469-disco.dts | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/boot/dts/stm32f469-disco.dts b/arch/arm/boot/dts/stm32f469-disco.dts index 9397db0c43de..082b24ee81f7 100644 --- a/arch/arm/boot/dts/stm32f469-disco.dts +++ b/arch/arm/boot/dts/stm32f469-disco.dts @@ -65,6 +65,20 @@ reg = <0x00000000 0x1000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + size = <0x400000>; + no-map; + linux,dma-default; + }; + + }; + aliases { serial0 = &usart3; }; -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel