Commit 19fbbbbc authored by Mike Looijmans's avatar Mike Looijmans Committed by Michael Turquette

Add TI CDCE925 I2C controlled clock synthesizer driver

This driver supports the TI CDCE925 programmable clock synthesizer.
The chip contains two PLLs with spread-spectrum clocking support and
five output dividers. The driver only supports the following setup,
and uses a fixed setting for the output muxes:
  Y1 is derived from the input clock
  Y2 and Y3 derive from PLL1
  Y4 and Y5 derive from PLL2
Given a target output frequency, the driver will set the PLL and
divider to best approximate the desired output.
Signed-off-by: default avatarMike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: default avatarMichael Turquette <mturquette@linaro.org>
parent 4d52b2ac
Binding for TO CDCE925 programmable I2C clock synthesizers.
Reference
This binding uses the common clock binding[1].
[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
[2] http://www.ti.com/product/cdce925
The driver provides clock sources for each output Y1 through Y5.
Required properties:
- compatible: Shall be "ti,cdce925"
- reg: I2C device address.
- clocks: Points to a fixed parent clock that provides the input frequency.
- #clock-cells: From common clock bindings: Shall be 1.
Optional properties:
- xtal-load-pf: Crystal load-capacitor value to fine-tune performance on a
board, or to compensate for external influences.
For both PLL1 and PLL2 an optional child node can be used to specify spread
spectrum clocking parameters for a board.
- spread-spectrum: SSC mode as defined in the data sheet.
- spread-spectrum-center: Use "centered" mode instead of "max" mode. When
present, the clock runs at the requested frequency on average. Otherwise
the requested frequency is the maximum value of the SCC range.
Example:
clockgen: cdce925pw@64 {
compatible = "cdce925";
reg = <0x64>;
clocks = <&xtal_27Mhz>;
#clock-cells = <1>;
xtal-load-pf = <5>;
/* PLL options to get SSC 1% centered */
PLL2 {
spread-spectrum = <4>;
spread-spectrum-center;
};
};
......@@ -78,6 +78,23 @@ config COMMON_CLK_SI570
This driver supports Silicon Labs 570/571/598/599 programmable
clock generators.
config COMMON_CLK_CDCE925
tristate "Clock driver for TI CDCE925 devices"
depends on I2C
depends on OF
select REGMAP_I2C
help
---help---
This driver supports the TI CDCE925 programmable clock synthesizer.
The chip contains two PLLs with spread-spectrum clocking support and
five output dividers. The driver only supports the following setup,
and uses a fixed setting for the output muxes.
Y1 is derived from the input clock
Y2 and Y3 derive from PLL1
Y4 and Y5 derive from PLL2
Given a target output frequency, the driver will set the PLL and
divider to best approximate the desired output.
config COMMON_CLK_S2MPS11
tristate "Clock driver for S2MPS1X/S5M8767 MFD"
depends on MFD_SEC_CORE
......
......@@ -38,6 +38,7 @@ obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o
obj-$(CONFIG_COMMON_CLK_CDCE925) += clk-cdce925.o
obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o
obj-$(CONFIG_ARCH_U300) += clk-u300.o
obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
......
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