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