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Broadcom Kona Family Clocks
This binding is associated with Broadcom SoCs having "Kona" style
clock control units (CCUs). A CCU is a clock provider that manages
a set of clock signals. Each CCU is represented by a node in the
device tree.
This binding uses the common clock binding:
Documentation/devicetree/bindings/clock/clock-bindings.txt
Required properties:
- compatible
Shall have a value of the form "brcm,<model>-<which>-ccu",
where <model> is a Broadcom SoC model number and <which> is
the name of a defined CCU. For example:
"brcm,bcm11351-root-ccu"
The compatible strings used for each supported SoC family
are defined below.
- reg
Shall define the base and range of the address space
containing clock control registers
- #clock-cells
Shall have value <1>. The permitted clock-specifier values
are defined below.
- clock-output-names
Shall be an ordered list of strings defining the names of
the clocks provided by the CCU.
Device tree example:
slave_ccu: slave_ccu {
compatible = "brcm,bcm11351-slave-ccu";
reg = <0x3e011000 0x0f00>;
#clock-cells = <1>;
clock-output-names = "uartb",
"uartb2",
"uartb3",
"uartb4";
};
ref_crystal_clk: ref_crystal {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <26000000>;
};
uart@3e002000 {
compatible = "brcm,bcm11351-dw-apb-uart", "snps,dw-apb-uart";
status = "disabled";
reg = <0x3e002000 0x1000>;
clocks = <&slave_ccu BCM281XX_SLAVE_CCU_UARTB3>;
interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
};
BCM281XX family
---------------
CCU compatible string values for SoCs in the BCM281XX family are:
"brcm,bcm11351-root-ccu"
"brcm,bcm11351-aon-ccu"
"brcm,bcm11351-hub-ccu"
"brcm,bcm11351-master-ccu"
"brcm,bcm11351-slave-ccu"
The following table defines the set of CCUs and clock specifiers for
BCM281XX family clocks. When a clock consumer references a clocks,
its symbolic specifier (rather than its numeric index value) should
be used. These specifiers are defined in:
"include/dt-bindings/clock/bcm281xx.h"
CCU Clock Type Index Specifier
--- ----- ---- ----- ---------
root frac_1m peri 0 BCM281XX_ROOT_CCU_FRAC_1M
aon hub_timer peri 0 BCM281XX_AON_CCU_HUB_TIMER
aon pmu_bsc peri 1 BCM281XX_AON_CCU_PMU_BSC
aon pmu_bsc_var peri 2 BCM281XX_AON_CCU_PMU_BSC_VAR
hub tmon_1m peri 0 BCM281XX_HUB_CCU_TMON_1M
master sdio1 peri 0 BCM281XX_MASTER_CCU_SDIO1
master sdio2 peri 1 BCM281XX_MASTER_CCU_SDIO2
master sdio3 peri 2 BCM281XX_MASTER_CCU_SDIO3
master sdio4 peri 3 BCM281XX_MASTER_CCU_SDIO4
master dmac peri 4 BCM281XX_MASTER_CCU_DMAC
master usb_ic peri 5 BCM281XX_MASTER_CCU_USB_IC
master hsic2_48m peri 6 BCM281XX_MASTER_CCU_HSIC_48M
master hsic2_12m peri 7 BCM281XX_MASTER_CCU_HSIC_12M
slave uartb peri 0 BCM281XX_SLAVE_CCU_UARTB
slave uartb2 peri 1 BCM281XX_SLAVE_CCU_UARTB2
slave uartb3 peri 2 BCM281XX_SLAVE_CCU_UARTB3
slave uartb4 peri 3 BCM281XX_SLAVE_CCU_UARTB4
slave ssp0 peri 4 BCM281XX_SLAVE_CCU_SSP0
slave ssp2 peri 5 BCM281XX_SLAVE_CCU_SSP2
slave bsc1 peri 6 BCM281XX_SLAVE_CCU_BSC1
slave bsc2 peri 7 BCM281XX_SLAVE_CCU_BSC2
slave bsc3 peri 8 BCM281XX_SLAVE_CCU_BSC3
slave pwm peri 9 BCM281XX_SLAVE_CCU_PWM
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