| Message ID | 20161104174240.9688-2-afd@ti.com |
|---|---|
| State | Changes Requested, archived |
| Headers | show |
On Fri, Nov 04, 2016 at 12:42:39PM -0500, Andrew F. Davis wrote: > Add TI SCI reset controller binding. This describes the DT binding > details for a reset controller node providing reset management services > to hardware blocks (reset consumers) using the Texas Instrument's System > Control Interface (TI SCI) protocol to communicate to a system controller > block present on the SoC. > > Signed-off-by: Andrew F. Davis <afd@ti.com> > [s-anna@ti.com: revise the binding format] > Signed-off-by: Suman Anna <s-anna@ti.com> > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > .../devicetree/bindings/reset/ti,sci-reset.txt | 65 ++++++++++++++++++++++ > MAINTAINERS | 2 + > include/dt-bindings/reset/k2g.h | 22 ++++++++ > 3 files changed, 89 insertions(+) > create mode 100644 Documentation/devicetree/bindings/reset/ti,sci-reset.txt > create mode 100644 include/dt-bindings/reset/k2g.h > > diff --git a/Documentation/devicetree/bindings/reset/ti,sci-reset.txt b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt > new file mode 100644 > index 0000000..cb00679 > --- /dev/null > +++ b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt > @@ -0,0 +1,65 @@ > +Texas Instruments System Control Interface (TI-SCI) Reset Controller > +===================================================================== > + > +Some TI SoCs contain a system controller (like the Power Management Micro > +Controller (PMMC) on Keystone K2G SoC) that are responsible for controlling > +the state of the various hardware modules present on the SoC. Communication > +between the host processor running an OS and the system controller happens > +through a protocol called TI System Control Interface (TI-SCI protocol). > +For TI SCI details, please refer to the document, > +Documentation/devicetree/bindings/arm/keystone/ti,sci.txt > + > +TI-SCI Reset Controller Node > +============================ > +This reset controller node uses the TI SCI protocol to perform the reset > +management of various hardware modules present on the SoC. Needs to say must be a child of the SCI node somewhere in here. > + > +Required properties: > +-------------------- > + - compatible : Should be "ti,sci-reset" > + - #reset-cells : Should be 2. Please see the reset consumer node below for > + usage details. > + > +TI-SCI 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 and reset specifier pair, one pair for each reset > + signal that affects the device, or that the device manages. > + The phandle should point to the TI-SCI reset controller node, > + and the reset specifier should have 2 cell-values. The first > + cell should contain the device ID, the values of which are > + specified in the <dt-bindings/genpd/<soc>.h> include file. > + The second cell should contain the reset mask value used by > + system controller, the values of which are specified in the > + include file <dt-bindings/reset/<soc>.h>, where <soc> is the > + name of the SoC involved, for example 'k2g'. > + > +Please also refer to Documentation/devicetree/bindings/reset/reset.txt for > +common reset controller usage by consumers. > + > +Example: > +-------- > +The following example demonstrates both a TI-SCI reset controller node and a > +consumer (a DSP device) on the K2G SoC. > + > +#include <dt-bindings/genpd/k2g.h> > +#include <dt-bindings/reset/k2g.h> > + > +pmmc: pmmc { > + compatible = "ti,k2g-sci"; > + > + k2g_reset: k2g_reset { ...: reset-controller { > + compatible = "ti,sci-reset"; > + #reset-cells = <2>; > + }; > +}; > + > +dsp0: dsp0 { > + ... > + resets = <&k2g_reset K2G_DEV_CGEM0 K2G_DEV_CGEM0_DSP0_RESET>; > + ... > +}; -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/reset/ti,sci-reset.txt b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt new file mode 100644 index 0000000..cb00679 --- /dev/null +++ b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt @@ -0,0 +1,65 @@ +Texas Instruments System Control Interface (TI-SCI) Reset Controller +===================================================================== + +Some TI SoCs contain a system controller (like the Power Management Micro +Controller (PMMC) on Keystone K2G SoC) that are responsible for controlling +the state of the various hardware modules present on the SoC. Communication +between the host processor running an OS and the system controller happens +through a protocol called TI System Control Interface (TI-SCI protocol). +For TI SCI details, please refer to the document, +Documentation/devicetree/bindings/arm/keystone/ti,sci.txt + +TI-SCI Reset Controller Node +============================ +This reset controller node uses the TI SCI protocol to perform the reset +management of various hardware modules present on the SoC. + +Required properties: +-------------------- + - compatible : Should be "ti,sci-reset" + - #reset-cells : Should be 2. Please see the reset consumer node below for + usage details. + +TI-SCI 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 and reset specifier pair, one pair for each reset + signal that affects the device, or that the device manages. + The phandle should point to the TI-SCI reset controller node, + and the reset specifier should have 2 cell-values. The first + cell should contain the device ID, the values of which are + specified in the <dt-bindings/genpd/<soc>.h> include file. + The second cell should contain the reset mask value used by + system controller, the values of which are specified in the + include file <dt-bindings/reset/<soc>.h>, where <soc> is the + name of the SoC involved, for example 'k2g'. + +Please also refer to Documentation/devicetree/bindings/reset/reset.txt for +common reset controller usage by consumers. + +Example: +-------- +The following example demonstrates both a TI-SCI reset controller node and a +consumer (a DSP device) on the K2G SoC. + +#include <dt-bindings/genpd/k2g.h> +#include <dt-bindings/reset/k2g.h> + +pmmc: pmmc { + compatible = "ti,k2g-sci"; + + k2g_reset: k2g_reset { + compatible = "ti,sci-reset"; + #reset-cells = <2>; + }; +}; + +dsp0: dsp0 { + ... + resets = <&k2g_reset K2G_DEV_CGEM0 K2G_DEV_CGEM0_DSP0_RESET>; + ... +}; diff --git a/MAINTAINERS b/MAINTAINERS index 6e93976..accf991 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11899,6 +11899,8 @@ F: drivers/soc/ti/ti_sci_pm_domains.c F: Documentation/devicetree/bindings/clock/ti,sci-clk.txt F: include/dt-bindings/clock/k2g.h F: drivers/clk/keystone/sci-clk.c +F: Documentation/devicetree/bindings/reset/ti,sci-reset.txt +F: include/dt-bindings/reset/k2g.h THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER M: Hans Verkuil <hverkuil@xs4all.nl> diff --git a/include/dt-bindings/reset/k2g.h b/include/dt-bindings/reset/k2g.h new file mode 100644 index 0000000..00e2a9b --- /dev/null +++ b/include/dt-bindings/reset/k2g.h @@ -0,0 +1,22 @@ +/* + * TI K2G SoC reset definitions + * + * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/ + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __DT_BINDINGS_RESET_K2G_H__ +#define __DT_BINDINGS_RESET_K2G_H__ + +#define K2G_DEV_CGEM0_DSP0_RESET 0x1 + +#endif