linux-kernel - [RFC PATCH 03/11] soc: tegra: config settings binding document

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Date: Tue, 7 May 2024 04:21:31 +0530
From: Krishna Yarlagadda <kyarlagadda@...dia.com>
To: <linux-tegra@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <corbet@....net>,
	<andi.shyti@...nel.org>, <wsa+renesas@...g-engineering.com>,
	<ulf.hansson@...aro.org>, <adrian.hunter@...el.com>, <digetx@...il.com>,
	<ldewangan@...dia.com>, <kyarlagadda@...dia.com>, <mkumard@...dia.com>
Subject: [RFC PATCH 03/11] soc: tegra: config settings binding document

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@...dia.com>
---
 .../misc/nvidia,tegra-config-settings.yaml    | 50 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 51 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..e379cbd5b597
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml
@@ -0,0 +1,50 @@
+# 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@...il.com>
+
+patternProperties:
+  "^[a-z0-9_]*$":
+    description:
+      Config name to be applied on controller.
+    type: object
+
+additionalProperties: true
+
+examples:
+  - |
+        config {
+            common {
+                nvidia,i2c-hs-sclk-high-period = <0x03>;
+                nvidia,i2c-hs-sclk-low-period = <0x08>;
+            };
+            fast {
+                nvidia,i2c-clk-divisor-fs-mode = <0x3c>;
+                nvidia,i2c-sclk-high-period = <0x02>;
+            };
+            fastplus {
+                nvidia,i2c-clk-divisor-fs-mode = <0x4f>;
+                nvidia,i2c-sclk-high-period = <0x07>;
+            };
+        };
diff --git a/MAINTAINERS b/MAINTAINERS
index 9eeb749ef234..a8c0cfd1d5a6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21996,6 +21996,7 @@ M:	Thierry Reding <thierry.reding@...il.com>
 R:	Laxman Dewangan <ldewangan@...dia.com>
 R:	Krishna Yarlagadda <kyarlagadda@...dia.com>
 S:	Supported
+F:	Documentation/devicetree/bindings/misc/nvidia,tegra-config-settings.yaml
 F:	Documentation/misc-devices/tegra-cfg.rst
 F:	drivers/soc/tegra/tegra-cfg.c
 
-- 
2.43.2