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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 one of the following values:
- "brcm,bcm11351-root-ccu"
- "brcm,bcm11351-aon-ccu"
- "brcm,bcm11351-hub-ccu"
- "brcm,bcm11351-master-ccu"
- "brcm,bcm11351-slave-ccu"
- 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.
BCM281XX family SoCs use Kona CCUs. The following table defines
the set of CCUs and clock specifiers for BCM281XX 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
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>;
};
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