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Message-Id: <20240724092950.752536-6-victor.liu@nxp.com>
Date: Wed, 24 Jul 2024 17:29:36 +0800
From: Liu Ying <victor.liu@....com>
To: dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org,
imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-phy@...ts.infradead.org
Cc: p.zabel@...gutronix.de,
airlied@...il.com,
daniel@...ll.ch,
maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
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Subject: [PATCH v3 05/19] dt-bindings: display: imx: Add i.MX8qxp Display Controller AXI performance counter
i.MX8qxp Display Controller contains a AXI performance counter which allows
measurement of average bandwidth and latency during operation.
Signed-off-by: Liu Ying <victor.liu@....com>
---
v3:
* New patch. (Rob)
...sl,imx8qxp-dc-axi-performance-counter.yaml | 57 +++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml
diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml
new file mode 100644
index 000000000000..1d6501afc7f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qxp Display Controller AXI Performance Counter
+
+description: |
+ Performance counters are provided to allow measurement of average bandwidth
+ and latency during operation. The following features are supported:
+
+ * Manual and timer controlled measurement mode.
+
+ * Measurement counters:
+ - GLOBAL_COUNTER for overall measurement time
+ - BUSY_COUNTER for number of data bus busy cycles
+ - DATA_COUNTER for number of data transfer cycles
+ - TRANSFER_COUNTER for number of transfers
+ - ADDRBUSY_COUNTER for number of address bus busy cycles
+ - LATENCY_COUNTER for average latency
+
+ * Counter overflow detection.
+
+ * Outstanding Transfer Counters (OTC) which are used for latency measurement
+ have to run immediately after reset, but can be disabled by software when
+ there is no need for latency measurement.
+
+maintainers:
+ - Liu Ying <victor.liu@....com>
+
+properties:
+ compatible:
+ const: fsl,imx8qxp-dc-axi-performance-counter
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/imx8-lpcg.h>
+
+ pmu@...8f000 {
+ compatible = "fsl,imx8qxp-dc-axi-performance-counter";
+ reg = <0x5618f000 0x90>;
+ clocks = <&dc0_lpcg IMX_LPCG_CLK_5>;
+ };
--
2.34.1
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