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: 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>
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Broadcom BCM2835 CPRMAN clocks
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This binding uses the common clock binding:
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Documentation/devicetree/bindings/clock/clock-bindings.txt
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The CPRMAN clock controller generates clocks in the audio power domain
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of the BCM2835. There is a level of PLLs deriving from an external
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oscillator, a level of PLL dividers that produce channels off of the
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few PLLs, and a level of mostly-generic clock generators sourcing from
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the PLL channels. Most other hardware components source from the
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clock generators, but a few (like the ARM or HDMI) will source from
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the PLL dividers directly.
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Required properties:
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- compatible: Should be "brcm,bcm2835-cprman"
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- #clock-cells: Should be <1>. The permitted clock-specifier values can be
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found in include/dt-bindings/clock/bcm2835.h
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- reg: Specifies base physical address and size of the registers
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- clocks: The external oscillator clock phandle
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Example:
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clk_osc: clock@3 {
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compatible = "fixed-clock";
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reg = <3>;
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#clock-cells = <0>;
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clock-output-names = "osc";
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clock-frequency = <19200000>;
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};
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clocks: cprman@7e101000 {
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compatible = "brcm,bcm2835-cprman";
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#clock-cells = <1>;
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reg = <0x7e101000 0x2000>;
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clocks = <&clk_osc>;
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};
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i2c0: i2c@7e205000 {
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compatible = "brcm,bcm2835-i2c";
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reg = <0x7e205000 0x1000>;
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interrupts = <2 21>;
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clocks = <&clocks BCM2835_CLOCK_VPU>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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47
include/dt-bindings/clock/bcm2835.h
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47
include/dt-bindings/clock/bcm2835.h
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/*
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* Copyright (C) 2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define BCM2835_PLLA 0
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#define BCM2835_PLLB 1
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#define BCM2835_PLLC 2
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#define BCM2835_PLLD 3
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#define BCM2835_PLLH 4
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#define BCM2835_PLLA_CORE 5
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#define BCM2835_PLLA_PER 6
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#define BCM2835_PLLB_ARM 7
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#define BCM2835_PLLC_CORE0 8
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#define BCM2835_PLLC_CORE1 9
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#define BCM2835_PLLC_CORE2 10
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#define BCM2835_PLLC_PER 11
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#define BCM2835_PLLD_CORE 12
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#define BCM2835_PLLD_PER 13
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#define BCM2835_PLLH_RCAL 14
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#define BCM2835_PLLH_AUX 15
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#define BCM2835_PLLH_PIX 16
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#define BCM2835_CLOCK_TIMER 17
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#define BCM2835_CLOCK_OTP 18
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#define BCM2835_CLOCK_UART 19
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#define BCM2835_CLOCK_VPU 20
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#define BCM2835_CLOCK_V3D 21
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#define BCM2835_CLOCK_ISP 22
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#define BCM2835_CLOCK_H264 23
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#define BCM2835_CLOCK_VEC 24
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#define BCM2835_CLOCK_HSM 25
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#define BCM2835_CLOCK_SDRAM 26
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#define BCM2835_CLOCK_TSENS 27
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#define BCM2835_CLOCK_EMMC 28
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#define BCM2835_CLOCK_PERI_IMAGE 29
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#define BCM2835_CLOCK_COUNT 30
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