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