[PATCH v2 4/4] doc: dt: add documentation for lpc1850-ccu clk driver

[Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Add DT binding documentation for lpc1850-ccu clk driver.

Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 .../devicetree/bindings/clock/lpc1850-ccu.txt      | 146 +++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/lpc1850-ccu.txt

diff --git a/Documentation/devicetree/bindings/clock/lpc1850-ccu.txt b/Documentation/devicetree/bindings/clock/lpc1850-ccu.txt
new file mode 100644
index 000000000000..1b45bc9f004f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/lpc1850-ccu.txt
@@ -0,0 +1,146 @@
+* 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.
+
+Which brach clocks that are available on the CCU depends on the
+specific LPC part.
+
+CCU1 branch clocks:
+Base clock	Branch clock		Description
+BASE_APB3_CLK	CLK_APB3_BUS		APB3 bus clock.
+		CLK_APB3_I2C1		Clock to the I2C1 register interface
+					and I2C1 peripheral clock.
+		CLK_APB3_DAC		Clock to the DAC register interface.
+		CLK_APB3_ADC0		Clock to the ADC0 register interface
+					and ADC0 peripheral clock.
+		CLK_APB3_ADC1		Clock to the ADC1 register interface
+					and ADC1 peripheral clock.
+		CLK_APB3_CAN0		Clock to the C_CAN0 register interface
+					and C_CAN0 peripheral clock.
+BASE_APB1_CLK	CLK_APB1_BUS		APB1 bus clock.
+		CLK_APB1_MOTOCON_PWM	Clock to the PWM Motor control block and
+					PWM Motor control peripheral clock.
+		CLK_APB1_I2C0		Clock to the I2C0 register interface and
+					I2C0 peripheral clock.
+		CLK_APB1_I2S		Clock to the I2S0 and I2S1 register interfaces
+					and I2S0 and I2S1 peripheral clock.
+		CLK_APB1_CAN1		Clock to the C_CAN1 register interface and
+					C_CAN1 peripheral clock.
+BASE_SPIFI_CLK	CLK_SPIFI		Clock for the SPIFI SCKI clock input.
+BASE_CPU_CLK	CLK_CPU_BUS		M4 bus clock.
+		CLK_CPU_SPIFI		Clock to the SPIFI register interface.
+		CLK_CPU_GPIO		Clock to the GPIO register interface
+		CLK_CPU_LCD		Clock to the LCD register interface.
+		CLK_CPU_ETHERNET	Clock to the Ethernet register interface.
+		CLK_CPU_USB0		Clock to the USB0 register interface.
+		CLK_CPU_EMC		Clock to the External memory controller.
+		CLK_CPU_SDIO		Clock to the SD/MMC register interface.
+		CLK_CPU_DMA		Clock to the DMA register interface.
+		CLK_CPU_CORE		Clock to the Cortex-M core
+		CLK_CPU_SCT		Clock to the SCT register interface.
+		CLK_CPU_USB1		Clock to the USB1 register interface.
+		CLK_CPU_EMC_DIV		Clock to the EMC with clock divider.
+		CLK_CPU_FLASHA		Clock to the flash bank A.
+		CLK_CPU_FLASHB		Clock to the flash bank B.
+		CLK_CPU_M0APP		Clock to the M0APP coprocessor.
+		CLK_CPU_ADCHS		Clock to the ADCHS.
+		CLK_CPU_EEPROM		Clock to the EEPROM.
+		CLK_CPU_WWDT		Clock to the WWDT register interface.
+		CLK_CPU_UART0		Clock to the USART0 register interface.
+		CLK_CPU_UART1		Clock to the UART1 register interface.
+		CLK_CPU_SSP0		Clock to the SSP0 register interface.
+		CLK_CPU_TIMER0		Clock to the timer0 register interface and
+					timer0 peripheral clock.
+		CLK_CPU_TIMER1		Clock to the timer1 register interface and
+					timer1 peripheral clock.
+		CLK_CPU_SCU		Clock to the System control unit register interface.
+		CLK_CPU_CREG		Clock to the CREG register interface.
+		CLK_CPU_RITIMER		Clock to the RI timer register interface and
+					RI timer peripheral clock.
+		CLK_CPU_UART2		Clock to the UART2 register interface.
+		CLK_CPU_UART3		Clock to the UART3 register interface.
+		CLK_CPU_TIMER2		Clock to the timer2 register interface and
+					timer2 peripheral clock.
+		CLK_CPU_TIMER3		Clock to the timer3 register interface and
+					timer3 peripheral clock.
+		CLK_CPU_SSP1		Clock to the SSP1 register interface.
+		CLK_CPU_QEI		Clock to the QEI register interface and
+					QEI peripheral clock.
+BASE_PERIPH_CLK	CLK_PERIPH_BUS		Clock to the peripheral bus and the
+					Cortex-M0 subsystem AHB multilayer matrix.
+		CLK_PERIPH_CORE		Clock to the Cortex-M0 subsystem core.
+		CLK_PERIPH_SGPIO	Clock to the SGPIO interface.
+BASE_USB0_CLK	CLK_USB0		USB0 peripheral clock.
+BASE_USB1_CLK	CLK_USB1		USB1 peripheral clock.
+BASE_SPI_CLK	CLK_SPI			Clock to the SPI interface.
+BASE_ADCHS_CLK	CLK_ADCHS		ADCHS clock.
+
+CCU2 branch clocks:
+BASE_AUDIO_CLK	CLK_AUDIO		Audio system (I2S) clock.
+BASE_UART3_CLK	CLK_APB2_UART3		USART3 peripheral clock.
+BASE_UART2_CLK	CLK_APB2_UART2		USART2 peripheral clock.
+BASE_UART1_CLK	CLK_APB0_UART1		UART1 peripheral clock.
+BASE_UART0_CLK	CLK_APB0_UART0		USART0 peripheral clock.
+BASE_SSP1_CLK	CLK_APB2_SSP1		SSP1 peripheral clock.
+BASE_SSP0_CLK	CLK_APB0_SSP0		SSP0 peripheral clock.
+BASE_SDIO_CLK	CLK_SDIO		SD/MMC peripheral clock.
+
+Not all branch clocks are available on all LPC parts. Check the user
+manual for your specific part.
+
+Note that CLK_M3_x and CLK_M4_x have been renamed to CLK_CPU_x here
+be more generic since both LPC18xx (M3) and LPC43xx (M4) are
+supported.
+
+
+Example board file:
+
+soc {
+	ccu1: ccu@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>;
+	};
+
+	ccu2: ccu@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>;
+	};
+
+	/* A user of CCU brach clocks */
+	uart1: serial@40082000 {
+		...
+		clocks = <&ccu2 CLK_APB0_UART1>, <&ccu1 CLK_CPU_UART1>;
+		...
+	};
+};
-- 
1.8.0

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