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Commit 3a61a5da authored by Nicolas Ferre's avatar Nicolas Ferre
Browse files

ARM: at91/tc: add device tree support to atmel_tclib 



Device tree support added to atmel_tclib: the generic Timer Counter
library. This is used by the clocksource/clockevent driver tcb_clksrc.

The current DT enabled platforms are also modified to use it:
- .dtsi files are modified to add Timer Counter Block entries
- alias are created to allow identification of each block
- clkdev lookup tables are added for clocks identification.

Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 29831297

Documentation/devicetree/bindings/arm/atmel-at91.txt

+24 −0
Original line number Diff line number Diff line
@@ -6,3 +6,27 @@ PIT Timer required properties: 
- reg: Should contain registers location and length

- interrupts: Should contain interrupt for the PIT which is the IRQ line

  shared across all System Controller members.



TC/TCLIB Timer required properties:

- compatible: Should be "atmel,<chip>-pit".

  <chip> can be "at91rm9200" or "at91sam9x5"

- reg: Should contain registers location and length

- interrupts: Should contain all interrupts for the TC block

  Note that you can specify several interrupt cells if the TC

  block has one interrupt per channel.



Examples:



One interrupt per TC block:

	tcb0: timer@fff7c000 {

		compatible = "atmel,at91rm9200-tcb";

		reg = <0xfff7c000 0x100>;

		interrupts = <18 4>;

	};



One interrupt per TC channel in a TC block:

	tcb1: timer@fffdc000 {

		compatible = "atmel,at91rm9200-tcb";

		reg = <0xfffdc000 0x100>;

		interrupts = <26 4 27 4 28 4>;

	};

arch/arm/boot/dts/at91sam9g20.dtsi

+14 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
		gpio0 = &pioA;

		gpio1 = &pioB;

		gpio2 = &pioC;

		tcb0 = &tcb0;

		tcb1 = &tcb1;

	};

	cpus {

		cpu@0 {
@@ -63,6 +65,18 @@ 
				interrupts = <1 4>;

			};



			tcb0: timer@fffa0000 {

				compatible = "atmel,at91rm9200-tcb";

				reg = <0xfffa0000 0x100>;

				interrupts = <17 4 18 4 19 4>;

			};



			tcb1: timer@fffdc000 {

				compatible = "atmel,at91rm9200-tcb";

				reg = <0xfffdc000 0x100>;

				interrupts = <26 4 27 4 28 4>;

			};



			pioA: gpio@fffff400 {

				compatible = "atmel,at91rm9200-gpio";

				reg = <0xfffff400 0x100>;

arch/arm/boot/dts/at91sam9g45.dtsi

+15 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 
		gpio2 = &pioC;

		gpio3 = &pioD;

		gpio4 = &pioE;

		tcb0 = &tcb0;

		tcb1 = &tcb1;

	};

	cpus {

		cpu@0 {
@@ -64,6 +66,19 @@ 
				interrupts = <1 4>;

			};





			tcb0: timer@fff7c000 {

				compatible = "atmel,at91rm9200-tcb";

				reg = <0xfff7c000 0x100>;

				interrupts = <18 4>;

			};



			tcb1: timer@fffd4000 {

				compatible = "atmel,at91rm9200-tcb";

				reg = <0xfffd4000 0x100>;

				interrupts = <18 4>;

			};



			dma: dma-controller@ffffec00 {

				compatible = "atmel,at91sam9g45-dma";

				reg = <0xffffec00 0x200>;

arch/arm/mach-at91/at91sam9260.c

+7 −0
Original line number Diff line number Diff line
@@ -209,6 +209,13 @@ static struct clk_lookup periph_clocks_lookups[] = { 
	CLKDEV_CON_DEV_ID("usart", "fffd0000.serial", &usart3_clk),

	CLKDEV_CON_DEV_ID("usart", "fffd4000.serial", &usart4_clk),

	CLKDEV_CON_DEV_ID("usart", "fffd8000.serial", &usart5_clk),

	/* more tc lookup table for DT entries */

	CLKDEV_CON_DEV_ID("t0_clk", "fffa0000.timer", &tc0_clk),

	CLKDEV_CON_DEV_ID("t1_clk", "fffa0000.timer", &tc1_clk),

	CLKDEV_CON_DEV_ID("t2_clk", "fffa0000.timer", &tc2_clk),

	CLKDEV_CON_DEV_ID("t0_clk", "fffdc000.timer", &tc3_clk),

	CLKDEV_CON_DEV_ID("t1_clk", "fffdc000.timer", &tc4_clk),

	CLKDEV_CON_DEV_ID("t2_clk", "fffdc000.timer", &tc5_clk),

	/* fake hclk clock */

	CLKDEV_CON_DEV_ID("hclk", "at91_ohci", &ohci_clk),

	CLKDEV_CON_ID("pioA", &pioA_clk),

arch/arm/mach-at91/at91sam9260_devices.c

+17 −0
Original line number Diff line number Diff line
@@ -699,8 +699,25 @@ static struct platform_device at91sam9260_tcb1_device = { 
	.num_resources	= ARRAY_SIZE(tcb1_resources),

};



#if defined(CONFIG_OF)

static struct of_device_id tcb_ids[] = {

	{ .compatible = "atmel,at91rm9200-tcb" },

	{ /*sentinel*/ }

};

#endif



static void __init at91_add_device_tc(void)

{

#if defined(CONFIG_OF)

	struct device_node *np;



	np = of_find_matching_node(NULL, tcb_ids);

	if (np) {

		of_node_put(np);

		return;

	}

#endif



	platform_device_register(&at91sam9260_tcb0_device);

	platform_device_register(&at91sam9260_tcb1_device);

}