mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 10:46:46 +07:00
ddfb157444
Add DT binding documentation for lpc1850-ccu clk driver. Signed-off-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Michael Turquette <mturquette@baylibre.com>
78 lines
2.6 KiB
Plaintext
78 lines
2.6 KiB
Plaintext
* NXP LPC1850 Clock Control Unit (CCU)
|
|
|
|
Each CGU base clock has several clock branches which can be turned on
|
|
or off independently by the Clock Control Units CCU1 or CCU2. The
|
|
branch clocks are distributed between CCU1 and CCU2.
|
|
|
|
- Above text taken from NXP LPC1850 User Manual.
|
|
|
|
This binding uses the common clock binding:
|
|
Documentation/devicetree/bindings/clock/clock-bindings.txt
|
|
|
|
Required properties:
|
|
- compatible:
|
|
Should be "nxp,lpc1850-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 the branch clock names defined in table below.
|
|
- clocks:
|
|
Shall contain a list of phandles for the base clocks routed
|
|
from the CGU to the specific CCU. See mapping of base clocks
|
|
and CCU in table below.
|
|
- clock-names:
|
|
Shall contain a list of names for the base clock routed
|
|
from the CGU to the specific CCU. Valid CCU clock names:
|
|
"base_usb0_clk", "base_periph_clk", "base_usb1_clk",
|
|
"base_cpu_clk", "base_spifi_clk", "base_spi_clk",
|
|
"base_apb1_clk", "base_apb3_clk", "base_adchs_clk",
|
|
"base_sdio_clk", "base_ssp0_clk", "base_ssp1_clk",
|
|
"base_uart0_clk", "base_uart1_clk", "base_uart2_clk",
|
|
"base_uart3_clk", "base_audio_clk"
|
|
|
|
Which branch clocks that are available on the CCU depends on the
|
|
specific LPC part. Check the user manual for your specific part.
|
|
|
|
A list of CCU clocks can be found in dt-bindings/clock/lpc18xx-ccu.h.
|
|
|
|
Example board file:
|
|
|
|
soc {
|
|
ccu1: clock-controller@40051000 {
|
|
compatible = "nxp,lpc1850-ccu";
|
|
reg = <0x40051000 0x1000>;
|
|
#clock-cells = <1>;
|
|
clocks = <&cgu BASE_APB3_CLK>, <&cgu BASE_APB1_CLK>,
|
|
<&cgu BASE_SPIFI_CLK>, <&cgu BASE_CPU_CLK>,
|
|
<&cgu BASE_PERIPH_CLK>, <&cgu BASE_USB0_CLK>,
|
|
<&cgu BASE_USB1_CLK>, <&cgu BASE_SPI_CLK>;
|
|
clock-names = "base_apb3_clk", "base_apb1_clk",
|
|
"base_spifi_clk", "base_cpu_clk",
|
|
"base_periph_clk", "base_usb0_clk",
|
|
"base_usb1_clk", "base_spi_clk";
|
|
};
|
|
|
|
ccu2: clock-controller@40052000 {
|
|
compatible = "nxp,lpc1850-ccu";
|
|
reg = <0x40052000 0x1000>;
|
|
#clock-cells = <1>;
|
|
clocks = <&cgu BASE_AUDIO_CLK>, <&cgu BASE_UART3_CLK>,
|
|
<&cgu BASE_UART2_CLK>, <&cgu BASE_UART1_CLK>,
|
|
<&cgu BASE_UART0_CLK>, <&cgu BASE_SSP1_CLK>,
|
|
<&cgu BASE_SSP0_CLK>, <&cgu BASE_SDIO_CLK>;
|
|
clock-names = "base_audio_clk", "base_uart3_clk",
|
|
"base_uart2_clk", "base_uart1_clk",
|
|
"base_uart0_clk", "base_ssp1_clk",
|
|
"base_ssp0_clk", "base_sdio_clk";
|
|
};
|
|
|
|
/* A user of CCU brach clocks */
|
|
uart1: serial@40082000 {
|
|
...
|
|
clocks = <&ccu2 CLK_APB0_UART1>, <&ccu1 CLK_CPU_UART1>;
|
|
...
|
|
};
|
|
};
|