mirror of
https://github.com/torvalds/linux.git
synced 2026-04-22 00:33:58 -04:00
22a41e9a50
Absolute paths in $ref should always begin with '/schemas'. The tools mostly work with it omitted, but for correctness the path should be everything except the hostname as that is taken from the schema's $id value. This scheme is defined in the json-schema spec. Cc: Hector Martin <marcan@marcan.st> Cc: Sven Peter <sven@svenpeter.dev> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Vivien Didelot <vivien.didelot@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Vladimir Oltean <olteanv@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Mark Brown <broonie@kernel.org> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mukesh Savaliya <msavaliy@codeaurora.org> Cc: Akash Asthana <akashast@codeaurora.org> Cc: Bayi Cheng <bayi.cheng@mediatek.com> Cc: Chuanhong Guo <gch981213@gmail.com> Cc: Min Guo <min.guo@mediatek.com> Cc: netdev@vger.kernel.org Cc: linux-spi@vger.kernel.org Cc: linux-usb@vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Mark Brown <broonie@debian.org> Link: https://lore.kernel.org/r/20220325215652.525383-1-robh@kernel.org
105 lines
3.5 KiB
YAML
105 lines
3.5 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
|
|
|
|
%YAML 1.2
|
|
---
|
|
$id: "http://devicetree.org/schemas/spi/sprd,spi-adi.yaml#"
|
|
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
|
|
|
|
title: Spreadtrum ADI controller
|
|
|
|
maintainers:
|
|
- Orson Zhai <orsonzhai@gmail.com>
|
|
- Baolin Wang <baolin.wang7@gmail.com>
|
|
- Chunyan Zhang <zhang.lyra@gmail.com>
|
|
|
|
description: |
|
|
ADI is the abbreviation of Anolog-Digital interface, which is used to access
|
|
analog chip (such as PMIC) from digital chip. ADI controller follows the SPI
|
|
framework for its hardware implementation is alike to SPI bus and its timing
|
|
is compatile to SPI timing.
|
|
|
|
ADI controller has 50 channels including 2 software read/write channels and
|
|
48 hardware channels to access analog chip. For 2 software read/write channels,
|
|
users should set ADI registers to access analog chip. For hardware channels,
|
|
we can configure them to allow other hardware components to use it independently,
|
|
which means we can just link one analog chip address to one hardware channel,
|
|
then users can access the mapped analog chip address by this hardware channel
|
|
triggered by hardware components instead of ADI software channels.
|
|
|
|
Thus we introduce one property named "sprd,hw-channels" to configure hardware
|
|
channels, the first value specifies the hardware channel id which is used to
|
|
transfer data triggered by hardware automatically, and the second value specifies
|
|
the analog chip address where user want to access by hardware components.
|
|
|
|
Since we have multi-subsystems will use unique ADI to access analog chip, when
|
|
one system is reading/writing data by ADI software channels, that should be under
|
|
one hardware spinlock protection to prevent other systems from reading/writing
|
|
data by ADI software channels at the same time, or two parallel routine of setting
|
|
ADI registers will make ADI controller registers chaos to lead incorrect results.
|
|
Then we need one hardware spinlock to synchronize between the multiple subsystems.
|
|
|
|
The new version ADI controller supplies multiple master channels for different
|
|
subsystem accessing, that means no need to add hardware spinlock to synchronize,
|
|
thus change the hardware spinlock support to be optional to keep backward
|
|
compatibility.
|
|
|
|
allOf:
|
|
- $ref: /schemas/spi/spi-controller.yaml#
|
|
|
|
properties:
|
|
compatible:
|
|
enum:
|
|
- sprd,sc9860-adi
|
|
- sprd,sc9863-adi
|
|
- sprd,ums512-adi
|
|
|
|
reg:
|
|
maxItems: 1
|
|
|
|
hwlocks:
|
|
maxItems: 1
|
|
|
|
hwlock-names:
|
|
const: adi
|
|
|
|
sprd,hw-channels:
|
|
$ref: /schemas/types.yaml#/definitions/uint32-matrix
|
|
description: A list of hardware channels
|
|
minItems: 1
|
|
maxItems: 48
|
|
items:
|
|
items:
|
|
- description: The hardware channel id which is used to transfer data
|
|
triggered by hardware automatically, channel id 0-1 are for software
|
|
use, 2-49 are hardware channels.
|
|
minimum: 2
|
|
maximum: 49
|
|
- description: The analog chip address where user want to access by
|
|
hardware components.
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
- '#address-cells'
|
|
- '#size-cells'
|
|
|
|
unevaluatedProperties: false
|
|
|
|
examples:
|
|
- |
|
|
aon {
|
|
#address-cells = <2>;
|
|
#size-cells = <2>;
|
|
|
|
adi_bus: spi@40030000 {
|
|
compatible = "sprd,sc9860-adi";
|
|
reg = <0 0x40030000 0 0x10000>;
|
|
hwlocks = <&hwlock1 0>;
|
|
hwlock-names = "adi";
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
sprd,hw-channels = <30 0x8c20>;
|
|
};
|
|
};
|
|
...
|