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Commit 433683a6 authored by Pawel Moll's avatar Pawel Moll
Browse files

ARM: vexpress: Remove motherboard dependencies in the DTS files 



The way the VE motherboard Device Trees were constructed
enforced naming and structure of daughterboard files. This
patch makes it possible to simply include the motherboard
description anywhere in the main Device Tree and retires
the "arm,v2m-timer" alias - any of the motherboard SP804
timers will be used instead.

Signed-off-by: default avatarPawel Moll <pawel.moll@arm.com>
parent 38669e04

Documentation/devicetree/bindings/arm/vexpress.txt

+22 −10
Original line number Diff line number Diff line
@@ -141,14 +141,19 @@ can be used to obtain required phandle in the tile's "aliases" node: 
- SP804 timers:

	v2m_timer01 and v2m_timer23



Current Linux implementation requires a "arm,v2m_timer" alias

pointing at one of the motherboard's SP804 timers, if it is to be

used as the system timer. This alias should be defined in the

motherboard files.



The tile description must define "ranges", "interrupt-map-mask" and

"interrupt-map" properties to translate the motherboard's address

and interrupt space into one used by the tile's processor.

The tile description should define a "smb" node, describing the

Static Memory Bus between the tile and motherboard. It must define

the following properties:

- "simple-bus" compatible value (to ensure creation of the children)

	compatible = "simple-bus";

- mapping of the SMB CS/offset addresses into main address space:

	#address-cells = <2>;

	#size-cells = <1>;

	ranges = <...>;

- interrupts mapping:

	#interrupt-cells = <1>;

	interrupt-map-mask = <0 0 63>;

	interrupt-map = <...>;





Example of a VE tile description (simplified)
@@ -200,13 +205,20 @@ Example of a VE tile description (simplified) 
		};

	};



	motherboard {

	smb {

		compatible = "simple-bus";



		#address-cells = <2>;

		#size-cells = <1>;

		/* CS0 is visible at 0x08000000 */

		ranges = <0 0 0x08000000 0x04000000>;



		#interrupt-cells = <1>;

		interrupt-map-mask = <0 0 63>;

		/* Active high IRQ 0 is connected to GIC's SPI0 */

		interrupt-map = <0 0 0 &gic 0 0 4>;



		/include/ "vexpress-v2m-rs1.dtsi"

	};

};

/include/ "vexpress-v2m-rs1.dtsi"

arch/arm/boot/dts/vexpress-v2m-rs1.dtsi

+4 −7
Original line number Diff line number Diff line
@@ -17,18 +17,16 @@ 
 * CHANGES TO vexpress-v2m.dtsi!

 */



/ {

	aliases {

		arm,v2m_timer = &v2m_timer01;

	};



	motherboard {

		compatible = "simple-bus";

		model = "V2M-P1";

		arm,hbi = <0x190>;

		arm,vexpress,site = <0>;

		arm,v2m-memory-map = "rs1";

		compatible = "arm,vexpress,v2m-p1", "simple-bus";

		#address-cells = <2>; /* SMB chipselect number and offset */

		#size-cells = <1>;

		#interrupt-cells = <1>;

		ranges;



		flash@0,00000000 {

			compatible = "arm,vexpress-flash", "cfi-flash";
@@ -340,4 +338,3 @@ 
			};

		};

	};
 
};

arch/arm/boot/dts/vexpress-v2m.dtsi

+4 −7
Original line number Diff line number Diff line
@@ -17,17 +17,15 @@ 
 * CHANGES TO vexpress-v2m-rs1.dtsi!

 */



/ {

	aliases {

		arm,v2m_timer = &v2m_timer01;

	};



	motherboard {

		compatible = "simple-bus";

		model = "V2M-P1";

		arm,hbi = <0x190>;

		arm,vexpress,site = <0>;

		compatible = "arm,vexpress,v2m-p1", "simple-bus";

		#address-cells = <2>; /* SMB chipselect number and offset */

		#size-cells = <1>;

		#interrupt-cells = <1>;

		ranges;



		flash@0,00000000 {

			compatible = "arm,vexpress-flash", "cfi-flash";
@@ -339,4 +337,3 @@ 
			};

		};

	};
 
};

arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts

+8 −3
Original line number Diff line number Diff line
@@ -220,7 +220,11 @@ 
		};

	};



	motherboard {

	smb {

		compatible = "simple-bus";



		#address-cells = <2>;

		#size-cells = <1>;

		ranges = <0 0 0 0x08000000 0x04000000>,

			 <1 0 0 0x14000000 0x04000000>,

			 <2 0 0 0x18000000 0x04000000>,
@@ -228,6 +232,7 @@ 
			 <4 0 0 0x0c000000 0x04000000>,

			 <5 0 0 0x10000000 0x04000000>;



		#interrupt-cells = <1>;

		interrupt-map-mask = <0 0 63>;

		interrupt-map = <0 0  0 &gic 0  0 4>,

				<0 0  1 &gic 0  1 4>,
@@ -272,7 +277,7 @@ 
				<0 0 40 &gic 0 40 4>,

				<0 0 41 &gic 0 41 4>,

				<0 0 42 &gic 0 42 4>;

	};

};



		/include/ "vexpress-v2m-rs1.dtsi"

	};

};

arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts

+8 −3
Original line number Diff line number Diff line
@@ -305,7 +305,11 @@ 
		};

	};



	motherboard {

	smb {

		compatible = "simple-bus";



		#address-cells = <2>;

		#size-cells = <1>;

		ranges = <0 0 0 0x08000000 0x04000000>,

			 <1 0 0 0x14000000 0x04000000>,

			 <2 0 0 0x18000000 0x04000000>,
@@ -313,6 +317,7 @@ 
			 <4 0 0 0x0c000000 0x04000000>,

			 <5 0 0 0x10000000 0x04000000>;



		#interrupt-cells = <1>;

		interrupt-map-mask = <0 0 63>;

		interrupt-map = <0 0  0 &gic 0  0 4>,

				<0 0  1 &gic 0  1 4>,
@@ -357,7 +362,7 @@ 
				<0 0 40 &gic 0 40 4>,

				<0 0 41 &gic 0 41 4>,

				<0 0 42 &gic 0 42 4>;

	};

};



		/include/ "vexpress-v2m-rs1.dtsi"

	};

};