linux-kernel - [PATCH v4 3/3] dt-bindings: firmware: qcom: scm: Separate VMIDs from header to bindings

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Date:   Mon,  9 Jan 2023 14:05:23 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH v4 3/3] dt-bindings: firmware: qcom: scm: Separate VMIDs from header to bindings

The SCM VMIDs represent predefined mappings that come from the
irreplaceable and non-omittable firmware that comes with every
Qualcomm SoC (unless you steal engineering samples from the factory)
and help clarify otherwise totally magic numbers which we are
required to pass to the secure world for some parts of the SoC to
work at all (with modem being the prime example).

On top of that, with changes to the rmtfs binding, secure VMIDs will
become useful to have in device trees for readability. Separate them
out and add to include/dt-bindings.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
v3 -> v4:
- Improve the commit message
- Dual-license
 include/dt-bindings/firmware/qcom,scm.h | 16 ++++++++++++++++
 include/linux/qcom_scm.h                |  7 ++-----
 2 files changed, 18 insertions(+), 5 deletions(-)
 create mode 100644 include/dt-bindings/firmware/qcom,scm.h

diff --git a/include/dt-bindings/firmware/qcom,scm.h b/include/dt-bindings/firmware/qcom,scm.h
new file mode 100644
index 000000000000..1a4e68fa0744
--- /dev/null
+++ b/include/dt-bindings/firmware/qcom,scm.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+/*
+ * Copyright (c) 2010-2015, 2018-2019 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2015 Linaro Ltd.
+ */
+
+#ifndef _DT_BINDINGS_FIRMWARE_QCOM_SCM_H
+#define _DT_BINDINGS_FIRMWARE_QCOM_SCM_H
+
+#define QCOM_SCM_VMID_HLOS		0x3
+#define QCOM_SCM_VMID_MSS_MSA		0xF
+#define QCOM_SCM_VMID_WLAN		0x18
+#define QCOM_SCM_VMID_WLAN_CE		0x19
+#define QCOM_SCM_VMID_NAV		0x2B
+
+#endif
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index 150b72edb879..1e449a5d7f5c 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -9,6 +9,8 @@
 #include <linux/types.h>
 #include <linux/cpumask.h>
 
+#include <dt-bindings/firmware/qcom,scm.h>
+
 #define QCOM_SCM_VERSION(major, minor)	(((major) << 16) | ((minor) & 0xFF))
 #define QCOM_SCM_CPU_PWR_DOWN_L2_ON	0x0
 #define QCOM_SCM_CPU_PWR_DOWN_L2_OFF	0x1
@@ -51,11 +53,6 @@ enum qcom_scm_ice_cipher {
 	QCOM_SCM_ICE_CIPHER_AES_256_CBC = 4,
 };
 
-#define QCOM_SCM_VMID_HLOS       0x3
-#define QCOM_SCM_VMID_MSS_MSA    0xF
-#define QCOM_SCM_VMID_WLAN       0x18
-#define QCOM_SCM_VMID_WLAN_CE    0x19
-#define QCOM_SCM_VMID_NAV        0x2B
 #define QCOM_SCM_PERM_READ       0x4
 #define QCOM_SCM_PERM_WRITE      0x2
 #define QCOM_SCM_PERM_EXEC       0x1
-- 
2.39.0