Document the device tree binding for Broadcom iProc architecture based
clock controller
Signed-off-by: Ray Jui <rjui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <sbranden@xxxxxxxxxxxx>
---
brcm,iproc-clocks.txt | 178 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 178 insertions(+)
create mode 100644 brcm,iproc-clocks.txt
diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
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+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+ Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+ Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+ Must be <0>
+
+- reg:
+ Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+ The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+ PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+ osc: oscillator {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <25000000>;
+ };
+
+ genpll: genpll {
+ #clock-cells = <0>;
+ compatible = "brcm,cygnus-genpll";
+ reg = <0x0301d000 0x2c>,
+ <0x0301c020 0x4>;
+ clocks = <&osc>;
+ };
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+ Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+ Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+ Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+ The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+ An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+ genpll: genpll {
+ #clock-cells = <0>;
+ compatible = "brcm,cygnus-genpll";
+ reg = <0x0301d000 0x2c>,
+ <0x0301c020 0x4>;
+ clocks = <&osc>;
+ };
+
+ genpll_clks: genpll_clks {
+ #clock-cells = <1>;
+ compatible = "brcm,cygnus-genpll-clk";
+ reg = <0x0301d000 0x2c>;
+ clocks = <&genpll>;
+ clock-output-names = "axi21", "250mhz", "ihost_sys",
+ "enet_sw", "audio_125", "can";
+ };
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+ Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+ Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+ Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+ The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+ An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+ osc: oscillator {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <25000000>;
+ };
+
+ asiu_clks: asiu_clks {
+ #clock-cells = <1>;
+ compatible = "brcm,cygnus-asiu-clk";
+ reg = <0x0301d048 0xc>,
+ <0x180aa024 0x4>;
+ clocks = <&osc>;
+ clock-output-names = "keypad", "adc/touch", "pwm";
+ };
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+ "brcm,cygnus-armpll"
+ "brcm,cygnus-genpll"
+ "brcm,cygnus-lcpll0"
+ "brcm,cygnus-mipipll"
+ "brcm,cygnus-genpll-clk"
+ "brcm,cygnus-lcpll0-clk"
+ "brcm,cygnus-mipipll-clk"
+ "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+ "include/dt-bindings/clock/bcm-cygnus.h"
+
+ Clock Source Index ID
+ --- ----- ----- ---------
+ crystal N/A N/A N/A
+
+ armpll crystal N/A N/A
+ genpll crystal N/A N/A
+ lcpll0 crystal N/A N/A
+ mipipll crystal N/A N/A
+
+ keypad crystal (ASIU) 0 BCM_CYGNUS_ASIU_KEYPAD_CLK
+ adc/tsc crystal (ASIU) 1 BCM_CYGNUS_ASIU_ADC_CLK
+ pwm crystal (ASIU) 2 BCM_CYGNUS_ASIU_PWM_CLK
+
+ axi21 genpll 0 BCM_CYGNUS_GENPLL_AXI21_CLK
+ 250mhz genpll 1 BCM_CYGNUS_GENPLL_250MHZ_CLK
+ ihost_sys genpll 2 BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+ enet_sw genpll 3 BCM_CYGNUS_GENPLL_ENET_SW_CLK
+ audio_125 genpll 4 BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+ can genpll 5 BCM_CYGNUS_GENPLL_CAN_CLK
+
+ pcie_phy lcpll0 0 BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+ ddr_phy lcpll0 1 BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+ sdio lcpll0 2 BCM_CYGNUS_LCPLL0_SDIO_CLK
+ usb_phy lcpll0 3 BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+ smart_card lcpll0 4 BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+ ch5 lcpll0 5 BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+ ch0_unused mipipll 0 BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+ ch1_lcd mipipll 1 BCM_CYGNUS_MIPIPLL_CH1_LCD
+ ch2_unused mipipll 2 BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+ ch3_unused mipipll 3 BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+ ch4_unused mipipll 4 BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+ ch5_unused mipipll 5 BCM_CYGNUS_MIPIPLL_CH5_UNUSED
--
1.7.9.5
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