Re: [PATCH v2 4/4] documentation: Add secure monitor binding documentation
From: Rob Herring <hidden>
Date: 2016-05-18 23:35:18
Also in:
linux-amlogic, linux-arm-kernel
On Wed, May 18, 2016 at 04:56:22PM +0200, Carlo Caione wrote:
quoted hunk
From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org> Add the binding documentation for the Amlogic secure monitor driver. Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org> --- .../devicetree/bindings/soc/meson/meson_sm.txt | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/meson/meson_sm.txtdiff --git a/Documentation/devicetree/bindings/soc/meson/meson_sm.txt b/Documentation/devicetree/bindings/soc/meson/meson_sm.txt new file mode 100644 index 0000000..f59c732 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/meson/meson_sm.txt
bindings/firmware/
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@@ -0,0 +1,45 @@ +* Amlogic Secure Monitor + +In the Amlogic SoCs the Secure Monitor code is used to provide access to the +NVMEM, enable JTAG, set USB boot, etc... + +Required properties for the secure monitor node: +- compatible: Should be "amlogic,meson-sm" +- amlogic,sm_cmd_input_base: SMC32 function identifier to read the physical + address of the input buffer +- amlogic,sm_cmd_output_base: SMC32 function identifier to read the physical + address of the output buffer
Use '-' rather than '_'.
+
+Example:
+
+ #include <dt-bindings/soc/meson-gxbb-sm.h>
+
+ ...
+
+ sm {Put this under a /firmware node.
+ compatible = "amlogic,meson-sm";
+ amlogic,sm_cmd_input_base = <SM_GET_SHARE_MEM_INPUT_BASE>;
+ amlogic,sm_cmd_output_base = <SM_GET_SHARE_MEM_OUTPUT_BASE>;
+ };
+
+Node of a device using the secure monitor must have a custom property to
+specify the SMC32 function the driver is going to use. The values of all the
+SMC function identifiers are listed in a SoC-specific header file:
+
+"include/dt-bindings/soc/meson-gxbb-sm.h" - for the Meson GXBB secure monitor.
+
+Example of the node using the secure monitor:
+
+ #include <dt-bindings/soc/meson-gxbb-sm.h>
+
+ ...
+
+ efuse: efuse {
+ compatible = "amlogic,meson-gxbb-efuse";
+ amlogic,sm_cmd_read_efuse = <SM_EFUSE_READ>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ ...
+ };
+
--
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