1 Device Tree Clock bindings for the Zynq 7000 EPP
3 The Zynq EPP has several different clk providers, each with there own bindings.
4 The purpose of this document is to document their usage.
6 See clock_bindings.txt for more information on the generic clock bindings.
7 See Chapter 25 of Zynq TRM for more information about Zynq clocks.
10 The clock controller is a logical abstraction of Zynq's clock tree. It reads
11 required input clock frequencies from the devicetree and acts as clock provider
12 for all clock consumers of PS clocks.
15 - #clock-cells : Must be 1
16 - compatible : "xlnx,ps7-clkc"
17 - ps-clk-frequency : Frequency of the oscillator providing ps_clk in HZ
18 (usually 33 MHz oscillators are used for Zynq platforms)
19 - clock-output-names : List of strings used to name the clock outputs. Shall be
20 a list of the outputs given below.
23 - clocks : as described in the clock bindings
24 - clock-names : as described in the clock bindings
25 - fclk-enable : Bit mask to enable FCLKs statically at boot time.
26 Bit [0..3] correspond to FCLK0..FCLK3. The corresponding
27 FCLK will only be enabled if it is actually running at
31 The following strings are optional parameters to the 'clock-names' property in
32 order to provide an optional (E)MIO clock source.
36 - mio_clk_XX # with XX = 00..53
92 compatible = "xlnx,ps7-clkc";
93 ps-clk-frequency = <33333333>;
94 clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
95 "cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
96 "dci", "lqspi", "smc", "pcap", "gem0", "gem1",
97 "fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
98 "sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
99 "dma", "usb0_aper", "usb1_aper", "gem0_aper",
100 "gem1_aper", "sdio0_aper", "sdio1_aper",
101 "spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
102 "i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
103 "gpio_aper", "lqspi_aper", "smc_aper", "swdt",
104 "dbg_trc", "dbg_apb";
106 clocks = <&clkc 16>, <&clk_foo>;
107 clock-names = "gem1_emio_clk", "can_mio_clk_23";