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@xxxxxx> [s-anna@xxxxxx: revise the binding format] Signed-off-by: Suman Anna <s-anna@xxxxxx> Signed-off-by: Nishanth Menon <nm@xxxxxx> --- .../devicetree/bindings/reset/ti,sci-reset.txt | 65 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 66 insertions(+) create mode 100644 Documentation/devicetree/bindings/reset/ti,sci-reset.txt 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..d8068df 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11899,6 +11899,7 @@ 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 THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER M: Hans Verkuil <hverkuil@xxxxxxxxx> -- 2.10.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html