lkml.org 
[lkml]   [2020]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] dt-bindings: devfreq: Document L2 Krait CPU Cache devfreq driver
Date
Document dedicated L2 Krait CPU Cache devfreq scaling driver.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
.../bindings/devfreq/krait-cache-devfreq.yaml | 77 +++++++++++++++++++
1 file changed, 77 insertions(+)
create mode 100644 Documentation/devicetree/bindings/devfreq/krait-cache-devfreq.yaml

diff --git a/Documentation/devicetree/bindings/devfreq/krait-cache-devfreq.yaml b/Documentation/devicetree/bindings/devfreq/krait-cache-devfreq.yaml
new file mode 100644
index 000000000000..099ed978e022
--- /dev/null
+++ b/Documentation/devicetree/bindings/devfreq/krait-cache-devfreq.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/krait-cache-devfreq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DEVFREQ driver for Krait L2 Cpu Cache Frequency Scaling
+
+maintainers:
+ - Ansuel Smith <ansuelsmth@gmail.com>
+
+description: |
+ This Scale the Krait CPU L2 Cache Frequency and optionally voltage
+ when the Cpu Frequency is changed (using the cpufreq notifier).
+
+ Cache is scaled with the max frequency across all core and the cache
+ frequency will scale based on the configured threshold in the dts.
+
+ The cache thresholds can be set to 3+ frequency bin, idle, nominal and
+ high.
+
+properties:
+ compatible:
+ const: qcom,krait-cache
+
+ clocks:
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+ description: Phandle to the L2 CPU clock
+
+ clock-names:
+ const: "l2"
+
+ voltage-tolerance:
+ description: Same voltage tolerance of the Krait CPU
+
+ l2-cpufreq:
+ description: |
+ Threshold used by the driver to scale the L2 cache.
+ If the max CPU Frequency is more than the set frequency,
+ the driver will transition to the next frequency bin.
+ Value is in kHz
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 3
+ items:
+ - description: idle
+ - description: nominal
+ - description: high
+
+ l2-supply:
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+ description: Phandle to the L2 regulator supply.
+
+ opp-table: true
+
+required:
+ - compatible
+ - clocks
+ - clock-names
+ - voltage-tolerance
+ - l2-cpufreq
+
+examples:
+ - |
+ qcom-krait-cache {
+ compatible = "qcom,krait-cache";
+ clocks = <&kraitcc 4>;
+ clock-names = "l2";
+ l2-cpufreq = <384000 600000 1200000>;
+ l2-supply = <&smb208_s1a>;
+
+ operating-points = <
+ /* kHz uV */
+ 384000 1100000
+ 1000000 1100000
+ 1200000 1150000
+ >;
+ };
--
2.27.0
\
 
 \ /
  Last update: 2020-09-27 18:06    [W:0.042 / U:1.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site