Patchwork [v3,2/2] Documentation: DT: Exynos: Bind SRAM though DT

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Submitter Sachin Kamat
Date May 8, 2014, 4:16 a.m.
Message ID <1399522592-23618-2-git-send-email-sachin.kamat@linaro.org>
Download mbox | patch
Permalink /patch/346881/
State New
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Comments

Sachin Kamat - May 8, 2014, 4:16 a.m.
Add SRAM binding documentation.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
No changes since v1.
---
 .../devicetree/bindings/arm/exynos/smp-sram.txt    |   38 ++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/exynos/smp-sram.txt
Tomasz Figa - May 8, 2014, 4:19 p.m.
Hi Sachin,

On 08.05.2014 06:16, Sachin Kamat wrote:
> Add SRAM binding documentation.
> 
> Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> ---
> No changes since v1.
> ---
>  .../devicetree/bindings/arm/exynos/smp-sram.txt    |   38 ++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/exynos/smp-sram.txt

Reviewed-by: Tomasz Figa <t.figa@samsung.com>

--
Best regards,
Tomasz
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Patch

diff --git a/Documentation/devicetree/bindings/arm/exynos/smp-sram.txt b/Documentation/devicetree/bindings/arm/exynos/smp-sram.txt
new file mode 100644
index 000000000000..c9ff2f58f9b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/exynos/smp-sram.txt
@@ -0,0 +1,38 @@ 
+Samsung Exynos SRAM for SMP bringup:
+------------------------------------
+
+Samsung SMP-capable Exynos SoCs use part of the SRAM for the bringup
+of the secondary cores. Once the core gets powered up it executes the
+code that is residing at some specific location of the SRAM.
+
+Therefore reserved section sub-nodes have to be added to the mmio-sram
+declaration. These nodes are of two types depending upon secure or
+non-secure execution environment.
+
+Required sub-node properties:
+- compatible : depending upon boot mode, should be
+		"samsung,exynos4210-sram" : for Secure SYSRAM
+		"samsung,exynos4210-sram-ns" : for Non-secure SYSRAM
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+	sram@02020000 {
+		compatible = "mmio-sram";
+		reg = <0x02020000 0x54000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0x02020000 0x54000>;
+
+		smp-sram@0 {
+			compatible = "samsung,exynos4210-sram";
+			reg = <0x0 0x1000>;
+		};
+
+		smp-sram@53000 {
+			compatible = "samsung,exynos4210-sram-ns";
+			reg = <0x53000 0x1000>;
+		};
+	};