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Commit 7dccd2ec authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

Merge tag 'reset-for-4.8-3' of git://git.pengutronix.de/git/pza/linux into next/drivers 

Merge "Reset controller changes for v4.8, part 3" from Philipp Zabel:

- change request API to be more explicit about the difference between
  exclusive and shared resets (the former guarantee the reset line is
  asserted immediately when reset_control_assert is called, the latter
  are refcounted and do not guarantee this).
- add Hisilicon hi6220 media subsystem reset controller support
- add TI SYSCON based reset controller support

* tag 'reset-for-4.8-3' of git://git.pengutronix.de/git/pza/linux:
  reset: add TI SYSCON based reset driver
  Documentation: dt: reset: Add TI syscon reset binding
  reset: hisilicon: Add hi6220 media subsystem reset support
  reset: hisilicon: Change to syscon register access
  arm64: dts: hi6220: Add media subsystem reset dts
  reset: hisilicon: Add media reset controller binding
  reset: TRIVIAL: Add line break at same place for similar APIs
  reset: Supply *_shared variant calls when using *_optional APIs
  reset: Supply *_shared variant calls when using of_* API
  reset: Ensure drivers are explicit when requesting reset lines
  reset: Reorder inline reset_control_get*() wrappers
parents 358c7917 af3e1629

Documentation/devicetree/bindings/reset/hisilicon,hi6220-reset.txt

+3 −1
Original line number Diff line number Diff line
@@ -8,7 +8,9 @@ The reset controller registers are part of the system-ctl block on 
hi6220 SoC.



Required properties:

- compatible: may be "hisilicon,hi6220-sysctrl"

- compatible: should be one of the following:

  - "hisilicon,hi6220-sysctrl", "syscon" : For peripheral reset controller.

  - "hisilicon,hi6220-mediactrl", "syscon" : For media reset controller.

- reg: should be register base and length as documented in the

  datasheet

- #reset-cells: 1, see below

Documentation/devicetree/bindings/reset/ti-syscon-reset.txt

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+91 −0
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TI SysCon Reset Controller

=======================



Almost all SoCs have hardware modules that require reset control in addition

to clock and power control for their functionality. The reset control is

typically provided by means of memory-mapped I/O registers. These registers are

sometimes a part of a larger register space region implementing various

functionalities. This register range is best represented as a syscon node to

allow multiple entities to access their relevant registers in the common

register space.



A SysCon Reset Controller node defines a device that uses a syscon node

and provides reset management functionality for various hardware modules

present on the SoC.



SysCon Reset Controller Node

============================

Each of the reset provider/controller nodes should be a child of a syscon

node and have the following properties.



Required properties:

--------------------

 - compatible		: Should be,

			    "ti,k2e-pscrst"

			    "ti,k2l-pscrst"

			    "ti,k2hk-pscrst"

			    "ti,syscon-reset"

 - #reset-cells		: Should be 1. Please see the reset consumer node below

			  for usage details

 - ti,reset-bits	: Contains the reset control register information

			  Should contain 7 cells for each reset exposed to

			  consumers, defined as:

			    Cell #1 : offset of the reset assert control

			              register from the syscon register base

			    Cell #2 : bit position of the reset in the reset

			              assert control register

			    Cell #3 : offset of the reset deassert control

			              register from the syscon register base

			    Cell #4 : bit position of the reset in the reset

			              deassert control register

			    Cell #5 : offset of the reset status register

			              from the syscon register base

			    Cell #6 : bit position of the reset in the

			              reset status register

			    Cell #7 : Flags used to control reset behavior,

			              availible flags defined in the DT include

			              file <dt-bindings/reset/ti-syscon.h>



SysCon Reset Consumer Nodes

===========================

Each of the reset consumer nodes should have the following properties,

in addition to their own properties.



Required properties:

--------------------

 - resets	: A phandle to the reset controller node and an index number

		  to a reset specifier as defined above.



Please also refer to Documentation/devicetree/bindings/reset/reset.txt for

common reset controller usage by consumers.



Example:

--------

The following example demonstrates a syscon node, the reset controller node

using the syscon node, and a consumer (a DSP device) on the TI Keystone 2

Edison SoC.



/ {

	soc {

		psc: power-sleep-controller@02350000 {

			compatible = "syscon", "simple-mfd";

			reg = <0x02350000 0x1000>;



			pscrst: psc-reset {

				compatible = "ti,k2e-pscrst", "ti,syscon-reset";

				#reset-cells = <1>;



				ti,reset-bits = <

					0xa3c 8 0xa3c 8 0x83c 8 (ASSERT_SET|DEASSERT_CLEAR|STATUS_SET)   /* 0: pcrst-dsp0 */

					0xa40 5 0xa44 3 0     0 (ASSERT_SET|DEASSERT_CLEAR|STATUS_NONE)  /* 1: pcrst-example */

				>;

			};

		};



		dsp0: dsp0 {

			...

			resets = <&pscrst 0>;

			...

		};

	};

};

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

+2 −0
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@@ -5,6 +5,7 @@ 
 */



#include <dt-bindings/interrupt-controller/arm-gic.h>

#include <dt-bindings/reset/hisi,hi6220-resets.h>

#include <dt-bindings/clock/hi6220-clock.h>

#include <dt-bindings/pinctrl/hisi.h>

#include <dt-bindings/thermal/thermal.h>
@@ -252,6 +253,7 @@ 
			compatible = "hisilicon,hi6220-mediactrl", "syscon";

			reg = <0x0 0xf4410000 0x0 0x1000>;

			#clock-cells = <1>;

			#reset-cells = <1>;

		};



		pm_ctrl: pm_ctrl@f7032000 {

drivers/reset/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -17,6 +17,16 @@ if RESET_CONTROLLER 
config RESET_OXNAS

	bool



config TI_SYSCON_RESET

	tristate "TI SYSCON Reset Driver"

	depends on HAS_IOMEM

	select MFD_SYSCON

	help

	  This enables the reset driver support for TI devices with

	  memory-mapped reset registers as part of a syscon device node. If

	  you wish to use the reset framework for such memory-mapped devices,

	  say Y here. Otherwise, say N.



source "drivers/reset/sti/Kconfig"

source "drivers/reset/hisilicon/Kconfig"

drivers/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,3 +10,4 @@ obj-$(CONFIG_ARCH_HISI) += hisilicon/ 
obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o

obj-$(CONFIG_ATH79) += reset-ath79.o

obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o

obj-$(CONFIG_TI_SYSCON_RESET) += reset-ti-syscon.o