linux-kernel - [PATCH 1/5] dt-bindings: firmware: qcom-scm: Add "allow-multi-call" property

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Date:   Mon, 27 Jun 2022 12:44:32 -0700
From:   Guru Das Srinagesh <quic_gurus@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     David Heidelberg <david@...t.cz>,
        Robert Marko <robimarko@...il.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>
Subject: [PATCH 1/5] dt-bindings: firmware: qcom-scm: Add "allow-multi-call" property

For firmware that supports it, allow multiple SCM calls to be passed
down to it by removing the serialization lock in the SCM driver.

There is a patch already [1] to convert the bindings to YAML. I will
make a patch against it when it gets accepted.

[1] https://lore.kernel.org/linux-arm-msm/20220626183247.142776-3-david@ixit.cz/

Signed-off-by: Guru Das Srinagesh <quic_gurus@...cinc.com>
---
 Documentation/devicetree/bindings/firmware/qcom,scm.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.txt b/Documentation/devicetree/bindings/firmware/qcom,scm.txt
index 0f4e5ab..8a68018 100644
--- a/Documentation/devicetree/bindings/firmware/qcom,scm.txt
+++ b/Documentation/devicetree/bindings/firmware/qcom,scm.txt
@@ -43,6 +43,8 @@ Required properties:
   clock and "bus" for the bus clock per the requirements of the compatible.
 - qcom,dload-mode: phandle to the TCSR hardware block and offset of the
 		   download mode control register (optional)
+- allow-multi-call: Specify this to remove SCM call serialization. Need to
+		    ensure that the firmware being used supports this.
 
 Example for MSM8916:
 
-- 
2.7.4