From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Torgue Subject: [PATCH v2 1/4] ARM: dts: stm32: add DMA memory pool on MCU which embed a cortex-M7 Date: Wed, 28 Feb 2018 14:10:55 +0100 Message-ID: <1519823458-27734-2-git-send-email-alexandre.torgue@st.com> References: <1519823458-27734-1-git-send-email-alexandre.torgue@st.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1519823458-27734-1-git-send-email-alexandre.torgue@st.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Maxime Coquelin , arnd@arndb.de, robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, patrice.chotard@st.com, lee.jones@linaro.org Cc: devicetree@vger.kernel.org, vladimir.murzin@arm.com, Alexandre Torgue , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org On cortex-M7 MCU, DMA have to use a non cache-able memory area. For this reason a dedicated memory pool is created for DMA. This patch creates a DMA memory pool of 1MB of each STM32 MCU which embeds a cortex-M7 except stm32f746-disco. Indeed, as stm32f746-disco has only a 8MB SDRAM and it's tricky to reduce memory used by Kernel. Reviewed-by: Vladimir Murzin Signed-off-by: Alexandre Torgue diff --git a/arch/arm/boot/dts/stm32746g-eval.dts b/arch/arm/boot/dts/stm32746g-eval.dts index e3f5a83..92651c3 100644 --- a/arch/arm/boot/dts/stm32746g-eval.dts +++ b/arch/arm/boot/dts/stm32746g-eval.dts @@ -58,6 +58,19 @@ reg = <0xc0000000 0x2000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + linux,dma-default; + no-map; + reg = <0xc1f00000 0x100000>; + }; + }; + aliases { serial0 = &usart1; }; diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts index d712260..c526853 100644 --- a/arch/arm/boot/dts/stm32f769-disco.dts +++ b/arch/arm/boot/dts/stm32f769-disco.dts @@ -59,6 +59,19 @@ reg = <0xC0000000 0x1000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + linux,dma-default; + no-map; + reg = <0xc0f00000 0x100000>; + }; + }; + aliases { serial0 = &usart1; }; diff --git a/arch/arm/boot/dts/stm32h743i-disco.dts b/arch/arm/boot/dts/stm32h743i-disco.dts index 45e088c..3689e70 100644 --- a/arch/arm/boot/dts/stm32h743i-disco.dts +++ b/arch/arm/boot/dts/stm32h743i-disco.dts @@ -57,6 +57,19 @@ reg = <0xd0000000 0x2000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + linux,dma-default; + no-map; + reg = <0xc1f00000 0x100000>; + }; + }; + aliases { serial0 = &usart2; }; diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts index c7187e1..b9af696 100644 --- a/arch/arm/boot/dts/stm32h743i-eval.dts +++ b/arch/arm/boot/dts/stm32h743i-eval.dts @@ -57,6 +57,19 @@ reg = <0xd0000000 0x2000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + linux,dma-default; + no-map; + reg = <0xc1f00000 0x100000>; + }; + }; + aliases { serial0 = &usart1; }; -- 2.7.4