devicetree: bindings: Document qcom,msm-id and qcom,board-id

The top level qcom,msm-id and qcom,board-id are utilized by bootloaders
on Qualcomm MSM platforms to determine which device tree should be
utilized and passed to the kernel.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/arm/msm/ids.txt b/Documentation/devicetree/bindings/arm/msm/ids.txt
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+* MSM-ID
+
+The qcom,msm-id entry specifies the MSM chipset and hardware revision.  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.
+
+PROPERTIES
+
+- qcom,msm-id:
+       Usage: required
+       Value type: <prop-encoded-array> (<chipset_id, rev_id> [, <c2, r2> ..])
+       Definition:
+               The "chipset_id" consists of three fields as below:
+
+               bits 0-15  = The unique MSM chipset id.
+               bits 16-31 = Reserved.  Should be 0
+
+               chipset_id is an exact match value
+
+               The "rev_id" is a chipset specific 32-bit id that represents
+               the version of the chipset.
+
+               The rev_id is a best match id.  The bootloader will look for
+               the closest possible patch.
+
+* BOARD-ID
+
+The qcom,board-id entry specifies 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.
+
+PROPERTIES
+
+- qcom,board-id:
+       Usage: required
+       Value type: <prop-encoded-array> (<board_id, subtype_id> [, <b2, s2> ..])
+       Definition:
+               The "board_id" consists of three fields as below:
+
+               bits 31-24 = Unusued.
+               bits 23-16 = Platform Version Major
+               bits 15-8  = Platfrom 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.
+
+               The "subtype_id" is 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 distinquished by different subtype_id
+               values.
+
+               subtype_id is an exact match value.
+
+EXAMPLE:
+       qcom,board-id = <15 2>;
+       qcom,msm-id = <0x1007e 0>;

diff --git a/include/dt-bindings/arm/qcom-ids.h b/include/dt-bindings/arm/qcom-ids.h
new file mode 100644 (file)
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+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#ifndef __DT_BINDINGS_QCOM_IDS_H
+#define __DT_BINDINGS_QCOM_IDS_H
+
+/* qcom,msm-id */
+#define QCOM_ID_MSM8916                206
+#define QCOM_ID_APQ8016                247
+#define QCOM_ID_MSM8216                248
+#define QCOM_ID_MSM8116                249
+#define QCOM_ID_MSM8616                250
+
+/* qcom,board-id */
+#define QCOM_BRD_ID(a, major, minor) \
+       (((major & 0xff) << 16) | ((minor & 0xff) << 8) | QCOM_BRD_ID_##a)
+
+#define QCOM_BRD_ID_MTP                8
+#define QCOM_BRD_ID_DRAGONBRD  10
+#define QCOM_BRD_ID_SBC                24
+
+#define QCOM_BRD_SUBTYPE_DEFAULT               0
+#define QCOM_BRD_SUBTYPE_MTP8916_SMB1360       1
+
+#endif