[RFC PATCH V2 02/12] dt-bindings: misc: Tegra configuration settings

Krishna Yarlagadda
2024-07-01T15:13:14Z

Config framework parses device tree and provides a list of register
settings with mask per mode to be applied by the controller.

Add binding document for config settings framework. Config settings
are defined as a property per field and have different modes per device.

Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
---
.../misc/nvidia,tegra-config-settings.yaml | 62 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 63 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml

diff --git a/Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml b/Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml
new file mode 100644
index 000000000000..4e5d52504c01
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/nvidia,tegra-config-settings.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Config properties for a device
+
+description:
+ Config setting is the configuration based on chip/board/system
+ characterization on interface/controller settings. This is needed for
+ - making the controller internal configuration to better perform
+ - making the interface to work proper by setting drive strength, slew
+ rates etc
+ - making the low power leakage.
+ There are two types of recommended configuration settings
+ - Controller register specific for internal operation of controller.
+ - Pad control/Pinmux/pincontrol registers for interfacing.
+ These configurations can further be categorized as static and dynamic.
+ - Static config does not change until a controller is reset.
+ - Dynamic config changes based on mode or condition, controller is
+ operating in.
+
+maintainers:
+ - Thierry Reding <thierry.reding@gmail.com>
+
+properties:
+ $nodename:
+ const: configsettings
+
+patternProperties:
+ "config-[a-z0-9_]+$":
+ description:
+ Config node representing properties of a device. Properties of
+ each device are listed under a unique subnode and referenced from
+ device node.
+ type: object
+ additionalProperties: false
+
+ patternProperties:
+ "^[a-z0-9_]+-cfg$":
+ description:
+ Config profiles applied conditionally.
+ type: object
+ patternProperties:
+ "nvidia,[a-z0-9_]+$":
+ description:
+ Register field configuration.
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+additionalProperties: true
+
+examples:
+ - |
+ configsettings {
+ configi2c1: config-i2c3160000 {
+ i2c-common-cfg {
+ nvidia,i2c-hs-sclk-high-period = <0x03>;
+ nvidia,i2c-hs-sclk-low-period = <0x08>;
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 8a60c98ac755..ac8410ed421f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22260,6 +22260,7 @@ M: Thierry Reding <thierry.reding@gmail.com>
R: Laxman Dewangan <ldewangan@nvidia.com>
R: Krishna Yarlagadda <kyarlagadda@nvidia.com>
S: Supported
+F: Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml
F: Documentation/misc-devices/tegra-cfg.rst

TEGRA PWM DRIVER
--
2.43.2