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Commit 2c74b539 authored by Eric Anholt's avatar Eric Anholt Committed by Stephen Boyd
Browse files

clk: bcm2835: Add binding docs for the new platform clock driver. 



Previously we've only supported a few fixed clocks based on
assumptions about how the firmware sets up the clocks, but this
binding will let us control the actual (audio power domain) clock
manager.

Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Acked-by: default avatarStephen Warren <swarren@wwwdotorg.org>
Acked-by: default avatarLee Jones <lee@kernel.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 4f61d8e2

Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt

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Broadcom BCM2835 CPRMAN clocks



This binding uses the common clock binding:

    Documentation/devicetree/bindings/clock/clock-bindings.txt



The CPRMAN clock controller generates clocks in the audio power domain

of the BCM2835.  There is a level of PLLs deriving from an external

oscillator, a level of PLL dividers that produce channels off of the

few PLLs, and a level of mostly-generic clock generators sourcing from

the PLL channels.  Most other hardware components source from the

clock generators, but a few (like the ARM or HDMI) will source from

the PLL dividers directly.



Required properties:

- compatible:	Should be "brcm,bcm2835-cprman"

- #clock-cells:	Should be <1>. The permitted clock-specifier values can be

		  found in include/dt-bindings/clock/bcm2835.h

- reg:		Specifies base physical address and size of the registers

- clocks:	The external oscillator clock phandle



Example:



	clk_osc: clock@3 {

		compatible = "fixed-clock";

		reg = <3>;

		#clock-cells = <0>;

		clock-output-names = "osc";

		clock-frequency = <19200000>;

	};



	clocks: cprman@7e101000 {

		compatible = "brcm,bcm2835-cprman";

		#clock-cells = <1>;

		reg = <0x7e101000 0x2000>;

		clocks = <&clk_osc>;

	};



	i2c0: i2c@7e205000 {

		compatible = "brcm,bcm2835-i2c";

		reg = <0x7e205000 0x1000>;

		interrupts = <2 21>;

		clocks = <&clocks BCM2835_CLOCK_VPU>;

		#address-cells = <1>;

		#size-cells = <0>;

	};

include/dt-bindings/clock/bcm2835.h

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/*

 * Copyright (C) 2015 Broadcom Corporation

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#define BCM2835_PLLA			0

#define BCM2835_PLLB			1

#define BCM2835_PLLC			2

#define BCM2835_PLLD			3

#define BCM2835_PLLH			4



#define BCM2835_PLLA_CORE		5

#define BCM2835_PLLA_PER		6

#define BCM2835_PLLB_ARM		7

#define BCM2835_PLLC_CORE0		8

#define BCM2835_PLLC_CORE1		9

#define BCM2835_PLLC_CORE2		10

#define BCM2835_PLLC_PER		11

#define BCM2835_PLLD_CORE		12

#define BCM2835_PLLD_PER		13

#define BCM2835_PLLH_RCAL		14

#define BCM2835_PLLH_AUX		15

#define BCM2835_PLLH_PIX		16



#define BCM2835_CLOCK_TIMER		17

#define BCM2835_CLOCK_OTP		18

#define BCM2835_CLOCK_UART		19

#define BCM2835_CLOCK_VPU		20

#define BCM2835_CLOCK_V3D		21

#define BCM2835_CLOCK_ISP		22

#define BCM2835_CLOCK_H264		23

#define BCM2835_CLOCK_VEC		24

#define BCM2835_CLOCK_HSM		25

#define BCM2835_CLOCK_SDRAM		26

#define BCM2835_CLOCK_TSENS		27

#define BCM2835_CLOCK_EMMC		28

#define BCM2835_CLOCK_PERI_IMAGE	29



#define BCM2835_CLOCK_COUNT		30