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CLK: Add binding document for Pistachio clock controllers 

Add a device-tree binding document describing the four clock
controllers present on the IMG Pistachio SoC.

Signed-off-by: Damien Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: James Hartley <james.hartley@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Damien Horsley <Damien.Horsley@imgtec.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Patchwork: https://patchwork.linux-mips.org/patch/9319/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Andrew Bresticker 2015-02-24 19:56:01 -08:00 committed by Ralf Baechle
parent b112e7c90e
commit 1006e3c931
2 changed files with 306 additions and 0 deletions
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123
Documentation/devicetree/bindings/clock/pistachio-clock.txt 100644
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Imagination Technologies Pistachio SoC clock controllers
========================================================
Pistachio has four clock controllers (core clock, peripheral clock, peripheral
general control, and top general control) which are instantiated individually
from the device-tree.
External clocks:
----------------
There are three external inputs to the clock controllers which should be
defined with the following clock-output-names:
- "xtal": External 52Mhz oscillator (required)
- "audio_clk_in": Alternate audio reference clock (optional)
- "enet_clk_in": Alternate ethernet PHY clock (optional)
Core clock controller:
----------------------
The core clock controller generates clocks for the CPU, RPU (WiFi + BT
co-processor), audio, and several peripherals.
Required properties:
- compatible: Must be "img,pistachio-clk".
- reg: Must contain the base address and length of the core clock controller.
- #clock-cells: Must be 1. The single cell is the clock identifier.
See dt-bindings/clock/pistachio-clk.h for the list of valid identifiers.
- clocks: Must contain an entry for each clock in clock-names.
- clock-names: Must include "xtal" (see "External clocks") and
"audio_clk_in_gate", "enet_clk_in_gate" which are generated by the
top-level general control.
Example:
clk_core: clock-controller@18144000 {
compatible = "img,pistachio-clk";
reg = <0x18144000 0x800>;
clocks = <&xtal>, <&cr_top EXT_CLK_AUDIO_IN>,
<&cr_top EXT_CLK_ENET_IN>;
clock-names = "xtal", "audio_clk_in_gate", "enet_clk_in_gate";
#clock-cells = <1>;
};
Peripheral clock controller:
----------------------------
The peripheral clock controller generates clocks for the DDR, ROM, and other
peripherals. The peripheral system clock ("periph_sys") generated by the core
clock controller is the input clock to the peripheral clock controller.
Required properties:
- compatible: Must be "img,pistachio-periph-clk".
- reg: Must contain the base address and length of the peripheral clock
controller.
- #clock-cells: Must be 1. The single cell is the clock identifier.
See dt-bindings/clock/pistachio-clk.h for the list of valid identifiers.
- clocks: Must contain an entry for each clock in clock-names.
- clock-names: Must include "periph_sys", the peripheral system clock generated
by the core clock controller.
Example:
clk_periph: clock-controller@18144800 {
compatible = "img,pistachio-clk-periph";
reg = <0x18144800 0x800>;
clocks = <&clk_core CLK_PERIPH_SYS>;
clock-names = "periph_sys";
#clock-cells = <1>;
};
Peripheral general control:
---------------------------
The peripheral general control block generates system interface clocks and
resets for various peripherals. It also contains miscellaneous peripheral
control registers. The system clock ("sys") generated by the peripheral clock
controller is the input clock to the system clock controller.
Required properties:
- compatible: Must include "img,pistachio-periph-cr" and "syscon".
- reg: Must contain the base address and length of the peripheral general
control registers.
- #clock-cells: Must be 1. The single cell is the clock identifier.
See dt-bindings/clock/pistachio-clk.h for the list of valid identifiers.
- clocks: Must contain an entry for each clock in clock-names.
- clock-names: Must include "sys", the system clock generated by the peripheral
clock controller.
Example:
cr_periph: syscon@18144800 {
compatible = "img,pistachio-cr-periph", "syscon";
reg = <0x18148000 0x1000>;
clocks = <&clock_periph PERIPH_CLK_PERIPH_SYS>;
clock-names = "sys";
#clock-cells = <1>;
};
Top-level general control:
--------------------------
The top-level general control block contains miscellaneous control registers and
gates for the external clocks "audio_clk_in" and "enet_clk_in".
Required properties:
- compatible: Must include "img,pistachio-cr-top" and "syscon".
- reg: Must contain the base address and length of the top-level
control registers.
- clocks: Must contain an entry for each clock in clock-names.
- clock-names: Two optional clocks, "audio_clk_in" and "enet_clk_in" (see
"External clocks").
- #clock-cells: Must be 1. The single cell is the clock identifier.
See dt-bindings/clock/pistachio-clk.h for the list of valid identifiers.
Example:
cr_top: syscon@18144800 {
compatible = "img,pistachio-cr-top", "syscon";
reg = <0x18149000 0x200>;
clocks = <&audio_refclk>, <&ext_enet_in>;
clock-names = "audio_clk_in", "enet_clk_in";
#clock-cells = <1>;
};

183
include/dt-bindings/clock/pistachio-clk.h 100644
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/*
* Copyright (C) 2014 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#ifndef _DT_BINDINGS_CLOCK_PISTACHIO_H
#define _DT_BINDINGS_CLOCK_PISTACHIO_H
/* PLLs */
#define CLK_MIPS_PLL 0
#define CLK_AUDIO_PLL 1
#define CLK_RPU_V_PLL 2
#define CLK_RPU_L_PLL 3
#define CLK_SYS_PLL 4
#define CLK_WIFI_PLL 5
#define CLK_BT_PLL 6
/* Fixed-factor clocks */
#define CLK_WIFI_DIV4 16
#define CLK_WIFI_DIV8 17
/* Gate clocks */
#define CLK_MIPS 32
#define CLK_AUDIO_IN 33
#define CLK_AUDIO 34
#define CLK_I2S 35
#define CLK_SPDIF 36
#define CLK_AUDIO_DAC 37
#define CLK_RPU_V 38
#define CLK_RPU_L 39
#define CLK_RPU_SLEEP 40
#define CLK_WIFI_PLL_GATE 41
#define CLK_RPU_CORE 42
#define CLK_WIFI_ADC 43
#define CLK_WIFI_DAC 44
#define CLK_USB_PHY 45
#define CLK_ENET_IN 46
#define CLK_ENET 47
#define CLK_UART0 48
#define CLK_UART1 49
#define CLK_PERIPH_SYS 50
#define CLK_SPI0 51
#define CLK_SPI1 52
#define CLK_EVENT_TIMER 53
#define CLK_AUX_ADC_INTERNAL 54
#define CLK_AUX_ADC 55
#define CLK_SD_HOST 56
#define CLK_BT 57
#define CLK_BT_DIV4 58
#define CLK_BT_DIV8 59
#define CLK_BT_1MHZ 60
/* Divider clocks */
#define CLK_MIPS_INTERNAL_DIV 64
#define CLK_MIPS_DIV 65
#define CLK_AUDIO_DIV 66
#define CLK_I2S_DIV 67
#define CLK_SPDIF_DIV 68
#define CLK_AUDIO_DAC_DIV 69
#define CLK_RPU_V_DIV 70
#define CLK_RPU_L_DIV 71
#define CLK_RPU_SLEEP_DIV 72
#define CLK_RPU_CORE_DIV 73
#define CLK_USB_PHY_DIV 74
#define CLK_ENET_DIV 75
#define CLK_UART0_INTERNAL_DIV 76
#define CLK_UART0_DIV 77
#define CLK_UART1_INTERNAL_DIV 78
#define CLK_UART1_DIV 79
#define CLK_SYS_INTERNAL_DIV 80
#define CLK_SPI0_INTERNAL_DIV 81
#define CLK_SPI0_DIV 82
#define CLK_SPI1_INTERNAL_DIV 83
#define CLK_SPI1_DIV 84
#define CLK_EVENT_TIMER_INTERNAL_DIV 85
#define CLK_EVENT_TIMER_DIV 86
#define CLK_AUX_ADC_INTERNAL_DIV 87
#define CLK_AUX_ADC_DIV 88
#define CLK_SD_HOST_DIV 89
#define CLK_BT_DIV 90
#define CLK_BT_DIV4_DIV 91
#define CLK_BT_DIV8_DIV 92
#define CLK_BT_1MHZ_INTERNAL_DIV 93
#define CLK_BT_1MHZ_DIV 94
/* Mux clocks */
#define CLK_AUDIO_REF_MUX 96
#define CLK_MIPS_PLL_MUX 97
#define CLK_AUDIO_PLL_MUX 98
#define CLK_AUDIO_MUX 99
#define CLK_RPU_V_PLL_MUX 100
#define CLK_RPU_L_PLL_MUX 101
#define CLK_RPU_L_MUX 102
#define CLK_WIFI_PLL_MUX 103
#define CLK_WIFI_DIV4_MUX 104
#define CLK_WIFI_DIV8_MUX 105
#define CLK_RPU_CORE_MUX 106
#define CLK_SYS_PLL_MUX 107
#define CLK_ENET_MUX 108
#define CLK_EVENT_TIMER_MUX 109
#define CLK_SD_HOST_MUX 110
#define CLK_BT_PLL_MUX 111
#define CLK_DEBUG_MUX 112
#define CLK_NR_CLKS 113
/* Peripheral gate clocks */
#define PERIPH_CLK_SYS 0
#define PERIPH_CLK_SYS_BUS 1
#define PERIPH_CLK_DDR 2
#define PERIPH_CLK_ROM 3
#define PERIPH_CLK_COUNTER_FAST 4
#define PERIPH_CLK_COUNTER_SLOW 5
#define PERIPH_CLK_IR 6
#define PERIPH_CLK_WD 7
#define PERIPH_CLK_PDM 8
#define PERIPH_CLK_PWM 9
#define PERIPH_CLK_I2C0 10
#define PERIPH_CLK_I2C1 11
#define PERIPH_CLK_I2C2 12
#define PERIPH_CLK_I2C3 13
/* Peripheral divider clocks */
#define PERIPH_CLK_ROM_DIV 32
#define PERIPH_CLK_COUNTER_FAST_DIV 33
#define PERIPH_CLK_COUNTER_SLOW_PRE_DIV 34
#define PERIPH_CLK_COUNTER_SLOW_DIV 35
#define PERIPH_CLK_IR_PRE_DIV 36
#define PERIPH_CLK_IR_DIV 37
#define PERIPH_CLK_WD_PRE_DIV 38
#define PERIPH_CLK_WD_DIV 39
#define PERIPH_CLK_PDM_PRE_DIV 40
#define PERIPH_CLK_PDM_DIV 41
#define PERIPH_CLK_PWM_PRE_DIV 42
#define PERIPH_CLK_PWM_DIV 43
#define PERIPH_CLK_I2C0_PRE_DIV 44
#define PERIPH_CLK_I2C0_DIV 45
#define PERIPH_CLK_I2C1_PRE_DIV 46
#define PERIPH_CLK_I2C1_DIV 47
#define PERIPH_CLK_I2C2_PRE_DIV 48
#define PERIPH_CLK_I2C2_DIV 49
#define PERIPH_CLK_I2C3_PRE_DIV 50
#define PERIPH_CLK_I2C3_DIV 51
#define PERIPH_CLK_NR_CLKS 52
/* System gate clocks */
#define SYS_CLK_I2C0 0
#define SYS_CLK_I2C1 1
#define SYS_CLK_I2C2 2
#define SYS_CLK_I2C3 3
#define SYS_CLK_I2S_IN 4
#define SYS_CLK_PAUD_OUT 5
#define SYS_CLK_SPDIF_OUT 6
#define SYS_CLK_SPI0_MASTER 7
#define SYS_CLK_SPI0_SLAVE 8
#define SYS_CLK_PWM 9
#define SYS_CLK_UART0 10
#define SYS_CLK_UART1 11
#define SYS_CLK_SPI1 12
#define SYS_CLK_MDC 13
#define SYS_CLK_SD_HOST 14
#define SYS_CLK_ENET 15
#define SYS_CLK_IR 16
#define SYS_CLK_WD 17
#define SYS_CLK_TIMER 18
#define SYS_CLK_I2S_OUT 24
#define SYS_CLK_SPDIF_IN 25
#define SYS_CLK_EVENT_TIMER 26
#define SYS_CLK_HASH 27
#define SYS_CLK_NR_CLKS 28
/* Gates for external input clocks */
#define EXT_CLK_AUDIO_IN 0
#define EXT_CLK_ENET_IN 1
#define EXT_CLK_NR_CLKS 2
#endif /* _DT_BINDINGS_CLOCK_PISTACHIO_H */