From 296cc300bd91c13c51f9f0efa7710392532be0b5 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Wed, 8 Jun 2016 15:16:49 +0200 Subject: [PATCH] ARM: at91: Document new TCB bindings The current binding for the TCB is not flexible enough for some use cases and prevents proper utilization of all the channels. Acked-by: Rob Herring Cc: devicetree@vger.kernel.org Acked-by: Nicolas Ferre Signed-off-by: Alexandre Belloni --- .../devicetree/bindings/arm/atmel-at91.txt | 32 ------------- .../devicetree/bindings/mfd/atmel-tcb.txt | 56 ++++++++++++++++++++++ 2 files changed, 56 insertions(+), 32 deletions(-) create mode 100644 Documentation/devicetree/bindings/mfd/atmel-tcb.txt diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt index 91cb8e4..31220b5 100644 --- a/Documentation/devicetree/bindings/arm/atmel-at91.txt +++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt @@ -90,38 +90,6 @@ System Timer (ST) required properties: Its subnodes can be: - watchdog: compatible should be "atmel,at91rm9200-wdt" -TC/TCLIB Timer required properties: -- compatible: Should be "atmel,-tcb". - 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. -- clock-names: tuple listing input clock names. - Required elements: "t0_clk", "slow_clk" - Optional elements: "t1_clk", "t2_clk" -- clocks: phandles to input clocks. - -Examples: - -One interrupt per TC block: - tcb0: timer@fff7c000 { - compatible = "atmel,at91rm9200-tcb"; - reg = <0xfff7c000 0x100>; - interrupts = <18 4>; - clocks = <&tcb0_clk>; - clock-names = "t0_clk"; - }; - -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>; - clocks = <&tcb1_clk>; - clock-names = "t0_clk"; - }; - RSTC Reset Controller required properties: - compatible: Should be "atmel,-rstc". can be "at91sam9260" or "at91sam9g45" or "sama5d3" diff --git a/Documentation/devicetree/bindings/mfd/atmel-tcb.txt b/Documentation/devicetree/bindings/mfd/atmel-tcb.txt new file mode 100644 index 0000000..c4a83e3 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/atmel-tcb.txt @@ -0,0 +1,56 @@ +* Device tree bindings for Atmel Timer Counter Blocks +- compatible: Should be "atmel,-tcb", "simple-mfd", "syscon". + can be "at91rm9200" or "at91sam9x5" +- reg: Should contain registers location and length +- #address-cells: has to be 1 +- #size-cells: has to be 0 +- 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. +- clock-names: tuple listing input clock names. + Required elements: "t0_clk", "slow_clk" + Optional elements: "t1_clk", "t2_clk" +- clocks: phandles to input clocks. + +The TCB can expose multiple subdevices: + * a timer + - compatible: Should be "atmel,tcb-timer" + - reg: Should contain the TCB channels to be used. If the + counter width is 16 bits (at91rm9200-tcb), two consecutive + channels are needed. Else, only one channel will be used. + +Examples: + +One interrupt per TC block: + tcb0: timer@fff7c000 { + compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0xfff7c000 0x100>; + interrupts = <18 4>; + clocks = <&tcb0_clk>, <&clk32k>; + clock-names = "t0_clk", "slow_clk"; + + timer@0 { + compatible = "atmel,tcb-timer"; + reg = <0>, <1>; + }; + + timer@2 { + compatible = "atmel,tcb-timer"; + reg = <2>; + }; + }; + +One interrupt per TC channel in a TC block: + tcb1: timer@fffdc000 { + compatible = "atmel,at91rm9200-tcb", "simple-mfd", "syscon"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0xfffdc000 0x100>; + interrupts = <26 4>, <27 4>, <28 4>; + clocks = <&tcb1_clk>, <&clk32k>; + clock-names = "t0_clk", "slow_clk"; + }; + + -- 2.7.4