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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/bus/qcom,ssc-block-bus.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: The AHB Bus Providing a Global View of the SSC Block on (some) qcom SoCs
maintainers:
- Michael Srba <Michael.Srba@seznam.cz>
description: |
This binding describes the dependencies (clocks, resets, power domains) which
need to be turned on in a sequence before communication over the AHB bus
becomes possible.
Additionally, the reg property is used to pass to the driver the location of
two sadly undocumented registers which need to be poked as part of the sequence.
The SSC (Snapdragon Sensor Core) block contains a gpio controller, i2c/spi/uart
controllers, a hexagon core, and a clock controller which provides clocks for
the above.
properties:
compatible:
items:
- const: qcom,msm8998-ssc-block-bus
- const: qcom,ssc-block-bus
reg:
description: |
Shall contain the addresses of the SSCAON_CONFIG0 and SSCAON_CONFIG1
registers
minItems: 2
maxItems: 2
reg-names:
items:
- const: mpm_sscaon_config0
- const: mpm_sscaon_config1
'#address-cells':
enum: [ 1, 2 ]
'#size-cells':
enum: [ 1, 2 ]
ranges: true
clocks:
minItems: 6
maxItems: 6
clock-names:
items:
- const: xo
- const: aggre2
- const: gcc_im_sleep
- const: aggre2_north
- const: ssc_xo
- const: ssc_ahbs
power-domains:
description: Power domain phandles for the ssc_cx and ssc_mx power domains
minItems: 2
maxItems: 2
power-domain-names:
items:
- const: ssc_cx
- const: ssc_mx
resets:
description: |
Reset phandles for the ssc_reset and ssc_bcr resets (note: ssc_bcr is the
branch control register associated with the ssc_xo and ssc_ahbs clocks)
minItems: 2
maxItems: 2
reset-names:
items:
- const: ssc_reset
- const: ssc_bcr
qcom,halt-regs:
$ref: /schemas/types.yaml#/definitions/phandle-array
description: describes how to locate the ssc AXI halt register
items:
- items:
- description: Phandle reference to a syscon representing TCSR
- description: offset for the ssc AXI halt register
required:
- compatible
- reg
- reg-names
- '#address-cells'
- '#size-cells'
- ranges
- clocks
- clock-names
- power-domains
- power-domain-names
- resets
- reset-names
- qcom,halt-regs
additionalProperties:
type: object
examples:
- |
#include <dt-bindings/clock/qcom,gcc-msm8998.h>
#include <dt-bindings/clock/qcom,rpmcc.h>
#include <dt-bindings/power/qcom-rpmpd.h>
soc {
#address-cells = <1>;
#size-cells = <1>;
// devices under this node are physically located in the SSC block, connected to an ssc-internal bus;
ssc_ahb_slave: bus@10ac008 {
#address-cells = <1>;
#size-cells = <1>;
ranges;
compatible = "qcom,msm8998-ssc-block-bus", "qcom,ssc-block-bus";
reg = <0x10ac008 0x4>, <0x10ac010 0x4>;
reg-names = "mpm_sscaon_config0", "mpm_sscaon_config1";
clocks = <&xo>,
<&rpmcc RPM_SMD_AGGR2_NOC_CLK>,
<&gcc GCC_IM_SLEEP>,
<&gcc AGGRE2_SNOC_NORTH_AXI>,
<&gcc SSC_XO>,
<&gcc SSC_CNOC_AHBS_CLK>;
clock-names = "xo", "aggre2", "gcc_im_sleep", "aggre2_north", "ssc_xo", "ssc_ahbs";
resets = <&gcc GCC_SSC_RESET>, <&gcc GCC_SSC_BCR>;
reset-names = "ssc_reset", "ssc_bcr";
power-domains = <&rpmpd MSM8998_SSCCX>, <&rpmpd MSM8998_SSCMX>;
power-domain-names = "ssc_cx", "ssc_mx";
qcom,halt-regs = <&tcsr_mutex_regs 0x26000>;
};
};
|
