@@ -403,6 +403,129 @@ properties:
- qcom,sm8450-qrd
- const: qcom,sm8450
+ # Board compatibles go above
+
+ qcom,msm-id:
+ $ref: /schemas/types.yaml#/definitions/uint32-matrix
+ minItems: 1
+ maxItems: 8
+ items:
+ items:
+ - description: |
+ MSM chipset ID - an exact match value consisting of three bitfields::
+ - bits 0-15 - The unique MSM chipset ID
+ - bits 16-31 - Reserved; should be 0
+ - description: |
+ Hardware revision ID - a chipset specific 32-bit ID representing
+ the version of the chipset. It is best a match value - the
+ bootloader will look for the closest possible match.
+ deprecated: true
+ description:
+ The MSM chipset and hardware revision use by Qualcomm bootloaders. It
+ can optionally be an array of these to indicate multiple hardware that
+ use the same device tree. It is expected that the bootloader will use
+ this information at boot-up to decide which device tree to use when given
+ multiple device trees, some of which may not be compatible with the
+ actual hardware. It is the bootloader's responsibility to pass the
+ correct device tree to the kernel.
+ The property is deprecated - it is not expected on newer boards
+ (starting with SM8350).
+
+ qcom,board-id:
+ $ref: /schemas/types.yaml#/definitions/uint32-matrix
+ minItems: 1
+ maxItems: 8
+ items:
+ oneOf:
+ - maxItems: 2
+ items:
+ - description: |
+ Board ID consisting of three bitfields::
+ - bits 31-24 - Unused
+ - bits 23-16 - Platform Version Major
+ - bits 15-8 - Platform Version Minor
+ - bits 7-0 - Platform Type
+ Platform Type field is an exact match value. The
+ Platform Major/Minor field is a best match. The bootloader will
+ look for the closest possible match.
+ - description: |
+ Subtype ID unique to a Platform Type/Chipset ID. For a given
+ Platform Type, there will typically only be a single board and the
+ subtype_id will be 0. However in some cases board variants may
+ need to be distinguished by different subtype_id values.
+ # OnePlus uses a variant of board-id with four elements:
+ - minItems: 4
+ items:
+ - const: 8
+ - const: 0
+ - description: OnePlus board ID
+ - description: OnePlus subtype ID
+ deprecated: true
+ description:
+ The board type and revision information. It can optionally be an array
+ of these to indicate multiple boards that use the same device tree. It
+ is expected that the bootloader will use this information at boot-up to
+ decide which device tree to use when given multiple device trees, some of
+ which may not be compatible with the actual hardware. It is the
+ bootloader's responsibility to pass the correct device tree to the
+ kernel
+ The property is deprecated - it is not expected on newer boards
+ (starting with SM8350).
+
+allOf:
+ # Explicit allow-list for older SoCs. The legacy properties are not allowed
+ # on newer SoCs.
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - qcom,apq8026
+ - qcom,apq8094
+ - qcom,apq8096
+ - qcom,msm8992
+ - qcom,msm8994
+ - qcom,msm8996
+ - qcom,msm8998
+ - qcom,sdm630
+ - qcom,sdm632
+ - qcom,sdm845
+ - qcom,sdx55
+ - qcom,sdx65
+ - qcom,sm6125
+ - qcom,sm6350
+ - qcom,sm7225
+ - qcom,sm8150
+ - qcom,sm8250
+ then:
+ properties:
+ qcom,board-id: true
+ qcom,msm-id: true
+ else:
+ properties:
+ qcom,board-id: false
+ qcom,msm-id: false
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - oneplus,cheeseburger
+ - oneplus,dumpling
+ - oneplus,enchilada
+ - oneplus,fajita
+ then:
+ properties:
+ qcom,board-id:
+ items:
+ minItems: 4
+ else:
+ properties:
+ qcom,board-id:
+ items:
+ maxItems: 2
+
additionalProperties: true
...
new file mode 100644
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Linaro Ltd
+ * Author: Krzysztof Kozlowski <krzk@kernel.org> based on previous work of Kumar Gala.
+ */
+#ifndef _DT_BINDINGS_ARM_QCOM_IDS_H
+#define _DT_BINDINGS_ARM_QCOM_IDS_H
+
+/* qcom,msm-id */
+#define QCOM_ID_APQ8026 199
+#define QCOM_ID_MSM8916 206
+#define QCOM_ID_MSM8994 207
+#define QCOM_ID_MSM8996_3_0 246
+#define QCOM_ID_APQ8016 247
+#define QCOM_ID_MSM8216 248
+#define QCOM_ID_MSM8116 249
+#define QCOM_ID_MSM8616 250
+#define QCOM_ID_MSM8998 292
+#define QCOM_ID_SDM845 321
+
+/* qcom,board-id */
+#define QCOM_BOARD_ID(a, major, minor) \
+ (((major & 0xff) << 16) | ((minor & 0xff) << 8) | QCOM_BOARD_ID_##a)
+
+#define QCOM_BOARD_ID_MTP 8
+#define QCOM_BOARD_ID_DRAGONBOARD 10
+#define QCOM_BOARD_ID_SBC 24
+
+#endif /* _DT_BINDINGS_ARM_QCOM_IDS_H */
The top level qcom,msm-id and qcom,board-id properties are utilized by bootloaders on Qualcomm MSM platforms to determine which device tree should be used and passed to the kernel. The commit b32e592d3c28 ("devicetree: bindings: Document qcom board compatible format") from 2015 was a consensus during discussion about upstreaming qcom,msm-id and qcom,board-id fields. There are however still problems with that consensus: 1. It was reached 7 years ago but it turned out its implementation did not reach all possible products. 2. Initially additional tool (dtbTool) was needed for parsing these fields to create a QCDT image consisting of multiple DTBs, later the bootloaders were improved and they use these qcom,msm-id and qcom,board-id properties directly. 3. Extracting relevant information from the board compatible requires this additional tool (dtbTool), which makes the build process more complicated and not easily reproducible (DTBs are modified after the kernel build). 4. Some versions of Qualcomm bootloaders expect these properties even when booting with a single DTB. The community is stuck with these bootloaders thus they require properties in the DTBs. Since several upstreamed Qualcomm SoC-based boards require these properties to properly boot and the properties are reportedly used by bootloaders, document them. Link: https://lore.kernel.org/r/a3c932d1-a102-ce18-deea-18cbbd05ecab@linaro.org/ Co-developed-by: Kumar Gala <galak@codeaurora.org> Signed-off-by: Kumar Gala <galak@codeaurora.org> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> --- .../devicetree/bindings/arm/qcom.yaml | 123 ++++++++++++++++++ include/dt-bindings/arm/qcom,ids.h | 30 +++++ 2 files changed, 153 insertions(+) create mode 100644 include/dt-bindings/arm/qcom,ids.h