[v5,2/2] dt-bindings: introduce Command DB for QCOM SoCs

Message ID 20180314171330.1828-3-ilina@codeaurora.org
State Changes Requested, archived
Headers show
Series
  • Untitled series #33799
Related show

Commit Message

Lina Iyer March 14, 2018, 5:13 p.m.
From: Mahesh Sivasubramanian <msivasub@codeaurora.org>

Command DB provides information on shared resources like clocks,
regulators etc., probed at boot by the remote subsytem and made
available in shared memory.

Cc: devicetree@vger.kernel.org
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- Fix unwanted capitalization
	- Add reg property
---
 .../devicetree/bindings/soc/qcom/cmd-db.txt        | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/cmd-db.txt

Comments

Stephen Boyd March 16, 2018, 6:27 p.m. | #1
Quoting Lina Iyer (2018-03-14 10:13:30)
> +Properties:
> +- compatible:
> +       Usage: required
> +       Value type: <string>
> +       Definition: Should be "qcom,cmd-db"
> +
> +- reg:
> +       Usage: required
> +       Value type: <prop encoded array>
> +       Definition: The register address that points to the location of the
> +                   Command DB in memory. Additionally, specify the address
> +                   and size of the actual lacation in memory.

s/lacation/location/ (seems this was missed from last round)

> +
> +Example:
> +
> +       reserved-memory {
> +               [...]
> +               qcom,cmd-db@c3f000c {
> +                       reg = <0x0 0xc3f000c 0x0 0x8>,
> +                             <0x0 0x85fe0000 0x0 0x20000>;

I agree with Bjorn and replied so on v4.

> +                       compatible = "qcom,cmd-db";
> +               };
> +       };
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 
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Patch

diff --git a/Documentation/devicetree/bindings/soc/qcom/cmd-db.txt b/Documentation/devicetree/bindings/soc/qcom/cmd-db.txt
new file mode 100644
index 000000000000..5737ed2ac6e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/cmd-db.txt
@@ -0,0 +1,38 @@ 
+Command DB
+---------
+
+Command DB is a database that provides a mapping between resource key and the
+resource address for a system resource managed by a remote processor. The data
+is stored in a shared memory region and is loaded by the remote processor.
+
+Some of the Qualcomm Technologies Inc SoC's have hardware accelerators for
+controlling shared resources. Depending on the board configuration the shared
+resource properties may change. These properties are dynamically probed by the
+remote processor and made available in the shared memory.
+
+The bindings for Command DB is specified in the reserved-memory section in
+devicetree. The devicetree representation of the command DB driver should be:
+
+Properties:
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: Should be "qcom,cmd-db"
+
+- reg:
+	Usage: required
+	Value type: <prop encoded array>
+	Definition: The register address that points to the location of the
+		    Command DB in memory. Additionally, specify the address
+		    and size of the actual lacation in memory.
+
+Example:
+
+	reserved-memory {
+		[...]
+		qcom,cmd-db@c3f000c {
+			reg = <0x0 0xc3f000c 0x0 0x8>,
+			      <0x0 0x85fe0000 0x0 0x20000>;
+			compatible = "qcom,cmd-db";
+		};
+	};