There are devices in the wild with non-updatable firmware coming with ACPI tables with rejected compatibles, e.g. "ltr,ltrf216a". Linux kernel still supports this device via ACPI PRP0001, however the compatible was never accepted to bindings. There are also several early PowerPC or SPARC platforms using compatibles for their OpenFirmware, but without in-tree DTS. Often the legacy compatible is not correct in terms of current Devicetree specification, e.g. missing vendor prefix. Finally there are also Linux-specific tools and test code with compatibles. Add a schema covering above cases purely to satisfy the DT schema and scripts/checkpatch.pl checks for undocumented compatibles. For ltr,ltrf216a this also documents the consensus: compatible is allowed only via ACPI PRP0001, but not bindings. Link: https://lore.kernel.org/all/20240705095047.90558-1-marex@xxxxxxx/ Link: https://lore.kernel.org/lkml/20220731173446.7400bfa8@jic23-huawei/T/#me55be502302d70424a85368c2645c89f860b7b40 Cc: Marek Vasut <marex@xxxxxxx> Cc: Jonathan Cameron <jic23@xxxxxxxxxx> Cc: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> --- Changes in v3: 1. Incorrect->Legacy 2. Drop ohci-littledian 3. Drop unittest Changes in v2: 1. Rename to incomplete-devices.yaml 2. Add many compatibles based on Rob's feedback, rewrite descriptions in the schema. --- .../bindings/incomplete-devices.yaml | 137 ++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 Documentation/devicetree/bindings/incomplete-devices.yaml diff --git a/Documentation/devicetree/bindings/incomplete-devices.yaml b/Documentation/devicetree/bindings/incomplete-devices.yaml new file mode 100644 index 000000000000..cfc1d39441b1 --- /dev/null +++ b/Documentation/devicetree/bindings/incomplete-devices.yaml @@ -0,0 +1,137 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/incomplete-devices.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Rejected, Legacy or Incomplete Devices + +maintainers: + - Rob Herring <robh@xxxxxxxxxx> + +description: + Some devices will not or should not get a proper Devicetree bindings, but + their compatibles are present in Linux drivers for various reasons. + + Examples are devices using ACPI PRP0001 with non-updatable firmware/ACPI + tables or old PowerPC platforms without in-tree DTS. + + Following list of devices is an incomplete schema with a goal to pass DT schema + checks on undocumented compatibles but also reject any DTS file using such + un-approved compatible. + + Usage of any of following compatibles is not allowed in Devicetree sources, + even if they come from immutable firmware. + +properties: + compatible: + oneOf: + - description: + Rejected compatibles in Devicetree, but used in ACPI-based devices + with non-updatable firmware/ACPI tables (via ACPI PRP0001) + enum: + - broadcom,bcm5241 + - ltr,ltrf216a + + - description: Legacy compatibles used on Macintosh devices + enum: + - adm1030 + - bmac+ + - heathrow-media-bay + - keylargo-media-bay + - lm87cimt + - MAC,adm1030 + - MAC,ds1775 + - max6690 + - ohare-media-bay + - ohare-swim3 + - smu-sat + - swim3 + + - description: Legacy compatibles used on other PowerPC devices + enum: + - 1682m-rng + - IBM,lhca + - IBM,lhea + - IBM,lhea-ethernet + - mpc5200b-fec-phy + - mpc5200-serial + - mpc5200-sram + - ohci-be + - ohci-bigendian + - ohci-le + + - description: Legacy compatibles used on SPARC devices + enum: + - bq4802 + - ds1287 + - isa-m5819p + - isa-m5823p + - m5819 + - sab82532 + - SUNW,bbc-beep + - SUNW,bbc-i2c + - SUNW,CS4231 + - SUNW,ebus-pic16f747-env + - SUNW,kt-cwq + - SUNW,kt-mau + - SUNW,n2-cwq + - SUNW,n2-mau + - SUNW,niusl + - SUNW,smbus-beep + - SUNW,sun4v-console + - SUNW,sun4v-pci + - SUNW,vf-cwq + - SUNW,vf-mau + + - description: Incomplete and/or legacy compatibles for unknown devices + enum: + - electra-cf + - i2cpcf,8584 + - virtio,uml + + - description: Linux kernel unit tests and sample code + enum: + - audio-graph-card2-custom-sample + - compat1 + - compat2 + - compat3 + - linux,spi-loopback-test + - mailbox-test + - regulator-virtual-consumer + + - description: + Devices on MIPS platform, without any DTS users. These are + unlikely to get converted to DT schema. + enum: + - mti,ranchu + + - description: + Devices on PowerPC platform, without any DTS users. These are + unlikely to get converted to DT schema. + enum: + - fujitsu,coral + - fujitsu,lime + - fujitsu,MB86276 + - fujitsu,MB86277 + - fujitsu,MB86293 + - fujitsu,MB86294 + - fujitsu,mint + - ibm,axon-msic + - ibm,pmemory + - ibm,pmemory-v2 + - ibm,power-rng + - ibm,ppc4xx-spi + - ibm,sdram-4xx-ddr2 + - ibm,secureboot + - ibm,secureboot-v1 + - ibm,secureboot-v2 + - ibm,secvar-backend + - sgy,gpio-halt + - wrs,epld-localbus + +required: + - compatible + - broken-usage-of-incorrect-compatible + +additionalProperties: false -- 2.43.0
