Alphascale Clock Controller
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The ACC (Alphascale Clock Controller) is responsible of choising proper
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clock source, setting deviders and clock gates.
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Required properties for the ACC node:
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- compatible: must be "alphascale,asm9260-clock-controller"
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- reg: must contain the ACC register base and size
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- #clock-cells : shall be set to 1.
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Simple one-cell clock specifier format is used, where the only cell is used
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as an index of the clock inside the provider.
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It is encouraged to use dt-binding for clock index definitions. SoC specific
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dt-binding should be included to the device tree descriptor. For example
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Alphascale ASM9260:
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#include <dt-bindings/clock/alphascale,asm9260.h>
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This binding contains two types of clock providers:
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_AHB_ - AHB gate;
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_SYS_ - adjustable clock source. Not all peripheral have _SYS_ clock provider.
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All clock specific details can be found in the SoC documentation.
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CLKID_AHB_ROM 0
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CLKID_AHB_RAM 1
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CLKID_AHB_GPIO 2
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CLKID_AHB_MAC 3
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CLKID_AHB_EMI 4
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CLKID_AHB_USB0 5
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CLKID_AHB_USB1 6
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CLKID_AHB_DMA0 7
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CLKID_AHB_DMA1 8
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CLKID_AHB_UART0 9
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CLKID_AHB_UART1 10
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CLKID_AHB_UART2 11
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CLKID_AHB_UART3 12
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CLKID_AHB_UART4 13
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CLKID_AHB_UART5 14
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CLKID_AHB_UART6 15
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CLKID_AHB_UART7 16
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CLKID_AHB_UART8 17
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CLKID_AHB_UART9 18
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CLKID_AHB_I2S0 19
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CLKID_AHB_I2C0 20
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CLKID_AHB_I2C1 21
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CLKID_AHB_SSP0 22
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CLKID_AHB_IOCONFIG 23
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CLKID_AHB_WDT 24
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CLKID_AHB_CAN0 25
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CLKID_AHB_CAN1 26
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CLKID_AHB_MPWM 27
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CLKID_AHB_SPI0 28
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CLKID_AHB_SPI1 29
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CLKID_AHB_QEI 30
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CLKID_AHB_QUADSPI0 31
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CLKID_AHB_CAMIF 32
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CLKID_AHB_LCDIF 33
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CLKID_AHB_TIMER0 34
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CLKID_AHB_TIMER1 35
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CLKID_AHB_TIMER2 36
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CLKID_AHB_TIMER3 37
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CLKID_AHB_IRQ 38
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CLKID_AHB_RTC 39
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CLKID_AHB_NAND 40
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CLKID_AHB_ADC0 41
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CLKID_AHB_LED 42
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CLKID_AHB_DAC0 43
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CLKID_AHB_LCD 44
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CLKID_AHB_I2S1 45
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CLKID_AHB_MAC1 46
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CLKID_SYS_CPU 47
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CLKID_SYS_AHB 48
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CLKID_SYS_I2S0M 49
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CLKID_SYS_I2S0S 50
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CLKID_SYS_I2S1M 51
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CLKID_SYS_I2S1S 52
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CLKID_SYS_UART0 53
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CLKID_SYS_UART1 54
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CLKID_SYS_UART2 55
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CLKID_SYS_UART3 56
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CLKID_SYS_UART4 56
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CLKID_SYS_UART5 57
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CLKID_SYS_UART6 58
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CLKID_SYS_UART7 59
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CLKID_SYS_UART8 60
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CLKID_SYS_UART9 61
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CLKID_SYS_SPI0 62
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CLKID_SYS_SPI1 63
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CLKID_SYS_QUADSPI 64
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CLKID_SYS_SSP0 65
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CLKID_SYS_NAND 66
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CLKID_SYS_TRACE 67
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CLKID_SYS_CAMM 68
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CLKID_SYS_WDT 69
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CLKID_SYS_CLKOUT 70
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CLKID_SYS_MAC 71
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CLKID_SYS_LCD 72
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CLKID_SYS_ADCANA 73
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Example of clock consumer with _SYS_ and _AHB_ sinks.
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uart4: serial@80010000 {
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compatible = "alphascale,asm9260-uart";
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reg = <0x80010000 0x4000>;
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clocks = <&acc CLKID_SYS_UART4>, <&acc CLKID_AHB_UART4>;
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interrupts = <19>;
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};
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Clock consumer with only one, _AHB_ sink.
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timer0: timer@80088000 {
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compatible = "alphascale,asm9260-timer";
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reg = <0x80088000 0x4000>;
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clocks = <&acc CLKID_AHB_TIMER0>;
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interrupts = <29>;
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};
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