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

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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: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Lee Jones <lee@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Eric Anholt 2015-09-28 14:22:03 -07:00 committed by Stephen Boyd
parent 4f61d8e220
commit 2c74b5399d
2 changed files with 92 additions and 0 deletions
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45
Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt Normal file
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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>;
};

47
include/dt-bindings/clock/bcm2835.h Normal file
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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