There is a device in the wild with non-updatable firmware coming with
ACPI tables with rejected "ltr,ltrf216a" compatible.  Linux kernel still
supports this device via ACPI PRP0001, however the compatible was never
accepted to bindings.  Lack of bindings causes checkpatch.pl warning
about undocumented compatible.

Add a schema for such ACPI PRP0001 devices purely to satisfy
checkpatch.pl and document consensus: ltr,ltrf216a compatible is allowed
only via ACPI PRP0001, but not bindings.

Link: https://lore.kernel.org/all/20240705095047.90558-1-marex@denx.de/
Link: https://lore.kernel.org/lkml/20220731173446.7400bfa8@jic23-huawei/T/#me55be502302d70424a85368c2645c89f860b7b40
Cc: Marek Vasut <marex@denx.de>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 .../devicetree/bindings/non-dt-devices.yaml   | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/non-dt-devices.yaml

diff --git a/Documentation/devicetree/bindings/non-dt-devices.yaml b/Documentation/devicetree/bindings/non-dt-devices.yaml
new file mode 100644
index 000000000000..206334693c7b
--- /dev/null
+++ b/Documentation/devicetree/bindings/non-dt-devices.yaml
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/non-dt-devices.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Non-devicetree Devices - Exception List
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+description:
+  Some devices using ACPI with non-updatable firmware/ACPI tables use
+  incorrect Devicetree compatibles via ACPI PRP0001.  Developers want to
+  support these devices, thus use such compatibles in Linux drivers, however
+  usage of these within Devicetree sources was rejected.
+
+  Following list of devices is an incomplete schema with a goal to pass Linux
+  kernel scripts/checkpatch.pl checks about 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.  New entries can be added
+  only on the basis of non-updatable ACPI firmware on the device.
+
+properties:
+  compatible:
+    enum:
+      - ltr,ltrf216a
+
+required:
+  - compatible
+  - broken-usage-of-incorrect-compatible
+
+additionalProperties: false
-- 
2.43.0

On Tue, Jul 09, 2024 at 10:44:01AM +0200, Krzysztof Kozlowski wrote:
> There is a device in the wild with non-updatable firmware coming with
> ACPI tables with rejected "ltr,ltrf216a" compatible.  Linux kernel still
> supports this device via ACPI PRP0001, however the compatible was never
> accepted to bindings.  Lack of bindings causes checkpatch.pl warning
> about undocumented compatible.

Why do we care? For checkpatch.pl I really don't. That hack check I 
wrote makes any string in binding docs a documented compatible. I have a 
better check using the schema written, but that would make checkpatch 
dependent on dtschema tools. So maybe just time to drop this check from 
checkpatch as we have other ways to check and track this.

However, I do care about 'make dt_compatible_check'. Besides these ACPI 
cases, there's a bunch of cases that we'll never have schemas for. Like 
everything from Sparc... Old PowerMac stuff... So I would like to 
'document' them just to exclude from dt_compatible_check. So perhaps 
this should be generalized.

> 
> Add a schema for such ACPI PRP0001 devices purely to satisfy
> checkpatch.pl and document consensus: ltr,ltrf216a compatible is allowed
> only via ACPI PRP0001, but not bindings.
> 
> Link: https://lore.kernel.org/all/20240705095047.90558-1-marex@denx.de/
> Link: https://lore.kernel.org/lkml/20220731173446.7400bfa8@jic23-huawei/T/#me55be502302d70424a85368c2645c89f860b7b40
> Cc: Marek Vasut <marex@denx.de>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
>  .../devicetree/bindings/non-dt-devices.yaml   | 35 +++++++++++++++++++
>  1 file changed, 35 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/non-dt-devices.yaml
> 
> diff --git a/Documentation/devicetree/bindings/non-dt-devices.yaml b/Documentation/devicetree/bindings/non-dt-devices.yaml
> new file mode 100644
> index 000000000000..206334693c7b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/non-dt-devices.yaml
> @@ -0,0 +1,35 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/non-dt-devices.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Non-devicetree Devices - Exception List
> +
> +maintainers:
> +  - Rob Herring <robh@kernel.org>
> +
> +description:
> +  Some devices using ACPI with non-updatable firmware/ACPI tables use
> +  incorrect Devicetree compatibles via ACPI PRP0001.  Developers want to
> +  support these devices, thus use such compatibles in Linux drivers, however
> +  usage of these within Devicetree sources was rejected.
> +
> +  Following list of devices is an incomplete schema with a goal to pass Linux
> +  kernel scripts/checkpatch.pl checks about 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.  New entries can be added
> +  only on the basis of non-updatable ACPI firmware on the device.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ltr,ltrf216a
> +
> +required:
> +  - compatible
> +  - broken-usage-of-incorrect-compatible

That's a neat trick...

> +
> +additionalProperties: false
> -- 
> 2.43.0
>

On Tue, Jul 9, 2024 at 11:15 AM Rob Herring <robh@kernel.org> wrote:
>
> On Tue, Jul 09, 2024 at 10:44:01AM +0200, Krzysztof Kozlowski wrote:
> > There is a device in the wild with non-updatable firmware coming with
> > ACPI tables with rejected "ltr,ltrf216a" compatible.  Linux kernel still
> > supports this device via ACPI PRP0001, however the compatible was never
> > accepted to bindings.  Lack of bindings causes checkpatch.pl warning
> > about undocumented compatible.
>
> Why do we care? For checkpatch.pl I really don't. That hack check I
> wrote makes any string in binding docs a documented compatible. I have a
> better check using the schema written, but that would make checkpatch
> dependent on dtschema tools. So maybe just time to drop this check from
> checkpatch as we have other ways to check and track this.
>
> However, I do care about 'make dt_compatible_check'. Besides these ACPI
> cases, there's a bunch of cases that we'll never have schemas for. Like
> everything from Sparc... Old PowerMac stuff... So I would like to
> 'document' them just to exclude from dt_compatible_check. So perhaps
> this should be generalized.

Here's my list of what's really not documented. It's just a grep of
the bindings of each compatible found by 'make dt_compatible_check'.
Probably anything with SUNW, ibm, amcc, or mpc5 is never going to be
documented.

There are some false positives such as cases documented like "fsl,<chip>-guts".

1682m-rng
abb,socrates-nand
adi,ad2s1200
adi,ad2s1205
adi,ad7816
adi,ad7817
adi,ad7818
adi,ad9833
adi,ad9834
adi,ad9837
adi,ad9838
adi,adis16203
adi,adm1024
adi,adm1027
adi,adt7316
adi,adt7317
adi,adt7318
adi,adt7463
adi,adt7468
adi,adt7516
adi,adt7517
adi,adt7519
adi,adxl34x
adm1030
allwinner,sun4i-a10-codec-clk
allwinner,sun4i-a10-pll2-clk
allwinner,sun4i-emac
allwinner,sun50i-h6-dwc3
allwinner,sun5i-a13-pll2-clk
allwinner,sun6i-a31-ahb1-mux-clk
allwinner,sun6i-a31-display-clk
allwinner,sun7i-a20-pll4-clk
allwinner,sun8i-a33-ahb1-gates-clk
alphascale,asm9260-icoll
altr,socfpga-a10-gate-clk
altr,socfpga-a10-perip-clk
altr,socfpga-a10-pll-clock
altr,socfpga-perip-clk
amcc,ppc440epx-rng
amcc,ppc460ex-rng
amcc,ppc4xx-crypto
amcc,sata-460ex
amlogic,meson-gxl-mmc
amlogic,meson-gxm-mmc
ams,as3722-pinctrl
ams,as3722-regulator
apm,xgene2-sgenet
apm,xgene2-xgenet
apm,xgene-ahci-v2
apm,xgene-gpio-v2
apm,xgene-reboot
apm,xgene-shadowcat
arcx,anybus-controller
arm,amba-bus
arm,armv7m-nvic
arm,core-module-versatile
arm,coresight-replicator
arm,external-bus-interface
arm,integrator-cp-timer
arm,integrator-timer
aspeed,ast2400-scu-ic
aspeed,ast2600-gfx
aspeed,g4-pinctrl
aspeed,g5-pinctrl
atmel,at91rm9200-clk-main
atmel,at91rm9200-clk-main-osc
atmel,at91rm9200-clk-master
atmel,at91rm9200-clk-peripheral
atmel,at91rm9200-clk-pll
atmel,at91rm9200-clk-programmable
atmel,at91rm9200-clk-system
atmel,at91rm9200-clk-usb
atmel,at91rm9200-usart-serial
atmel,at91sam9260-clk-slow
atmel,at91sam9261-pmc
atmel,at91sam9263-pmc
atmel,at91sam9g20-clk-pllb
atmel,at91sam9g45-clk-pll
atmel,at91sam9g45-clk-programmable
atmel,at91sam9n12-clk-usb
atmel,at91sam9rl-dma
atmel,at91sam9rl-ssc
atmel,at91sam9x5-clk-main
atmel,at91sam9x5-clk-main-rc-osc
atmel,at91sam9x5-clk-master
atmel,at91sam9x5-clk-peripheral
atmel,at91sam9x5-clk-plldiv
atmel,at91sam9x5-clk-programmable
atmel,at91sam9x5-clk-smd
atmel,at91sam9x5-clk-usb
atmel,at91sam9x5-clk-utmi
atmel,atmel_mxt_tp
atmel,atmel_mxt_ts
atmel,mXT224
atmel,qt602240_ts
atmel,sama5d2-clk-audio-pll-frac
atmel,sama5d2-clk-audio-pll-pad
atmel,sama5d2-clk-audio-pll-pmc
atmel,sama5d2-clk-generated
atmel,sama5d2-clk-i2s-mux
atmel,sama5d2-sfr
atmel,sama5d3-adc
atmel,sama5d3-clk-pll
atmel,sama5d3-tcb
atmel,sama5d4-clk-h32mx
atmel,sama5d4-sfr
atmel,samx7-rstc
audio-graph-card2-custom-sample
bcm,kona-sdhci
bcm,kona-smc
bcm,kona-timer
bmac+
bosch,bmp181
bq4802
brcm,40nm-ephy
brcm,bcm58535-srab
brcm,bcm7125-sun-top-ctrl
brcm,bcm7211-dpfe-cpu
brcm,bcm7278-dpfe-cpu
brcm,bcm7346-sun-top-ctrl
brcm,bcm7358-sun-top-ctrl
brcm,bcm7360-sun-top-ctrl
brcm,bcm7362-sun-top-ctrl
brcm,bcm7420-sun-top-ctrl
brcm,bcm7425-sun-top-ctrl
brcm,bcm7429-sun-top-ctrl
brcm,bcm7435-sun-top-ctrl
brcm,brcmstb-sun-top-ctrl
brcm,ehci-brcm-v2
brcm,vc4-v3d
broadcom,bcm5241
buffalo,ls421d
buffalo,ls421de
cavium,mdio-mux
cavium,mdio-mux-sn74cbtlv3253
cdns,pc302-gem
cdns,xtfpga-clock
chrp,mesh0
compat2
compat3
dallas,max6654
dlg,da9053-ba
dlg,da9053-bc
ds1287
electra-cf
epapr,hv-byte-channel
epson,rx8803
fcu
fsl,1s1021a-msi
fsl,1s1043a-msi
fsl,avic
fsl,b4860-l3-cache-controller
fsl,bsc9131-guts
fsl,bsc9132-guts
fsl,elbc-fcm-nand
fsl,ep8248e-bcsr
fsl,ep8248e-mdio-bitbang
fsl,icoll
fsl,imx1-dma
fsl,imx1-iomuxc
fsl,imx21-dma
fsl,imx21-nand
fsl,imx25-iomuxc
fsl,imx25-nand
fsl,imx51-ipu
fsl,imx51-nand
fsl,imx53-nand
fsl,imx53-tve
fsl,imx6q-ipu
fsl,imx6q-mlb150
fsl,imx8qm-ahci
fsl,ls1021a-esdhc
fsl,ls1028a-ahci
fsl,ls1043a-ahci
fsl,ls1046a-ahci
fsl,ls1088a-ahci
fsl,ls2080a-ahci
fsl,ls2088a-ahci
fsl,lx2160a-ahci
fsl,mc34708
fsl,mpc5121-fec
fsl,mpc5121-fec-mdio
fsl,mpc5121-gpio
fsl,mpc5121-localbus
fsl,mpc5121-mbx
fsl,mpc5121-nfc
fsl,mpc5121-pci
fsl,mpc5121-rtc
fsl,mpc5121-sdhc
fsl,mpc5121-sram
fsl,mpc5125-fec
fsl,mpc5125-psc-spi
fsl,mpc5125-psc-uart
fsl,mpc5200b-mdio
fsl,mpc5200b-psc-ac97
fsl,mpc5200b-psc-i2s
fsl,mpc5200b-psc-uart
fsl,mpc5200-mdio
fsl,mpc5200-sram
fsl,mpc8272-cpm-usb
fsl,mpc8379-esdhc
fsl,mpc8536-guts
fsl,mpc8544-guts
fsl,mpc8548-pcie
fsl,mpc8568-guts
fsl,mpc8569-guts
fsl,mpc8572-guts
fsl,mpc8610-pci
fsl,mpc8641-pcie
fsl,p1010-esdhc
fsl,p1010-guts
fsl,p1010-pcie
fsl,p1020-guts
fsl,p1021-guts
fsl,p1022-guts
fsl,p1022-pcie
fsl,p1023-guts
fsl,p1023-pcie
fsl,p2020-guts
fsl,p4080-l3-cache-controller
fsl,p4080-pcie
fsl,pq1-fec-enet
fsl,pq2pro-localbus
fsl,pq3-gpio
fsl,pq3-localbus
fsl,pq-sata-v2
fsl,qoriq-pcie
fsl,qoriq-pcie-v2.1
fsl,qoriq-pcie-v2.2
fsl,qoriq-pcie-v2.3
fsl,qoriq-pcie-v2.4
fsl,qoriq-pcie-v3.0
fsl,sec4.0
fsl,sec4.0-job-ring
fsl,t4240-l3-cache-controller
fsl,timrot
fsl,tzic
fsl,vf610-pit
fsl,vmpic-msi
fsl,vmpic-msi-v4.3
fujitsu,coral
fujitsu,lime
fujitsu,MB86276
fujitsu,MB86277
fujitsu,MB86293
fujitsu,MB86294
fujitsu,mint
gef,fpga-wdt
gef,sbc310-gpio
gef,sbc610-gpio
ge,imp3a-gpio
gen_nand
giantplus,gpg482739qs5
google,arche-platform
gpio-mockup
gpio-simulator
grmn,lidar-lite-v3
hawk-bridge
heathrow-media-bay
himax,hx8369
hisilicon,hi3670-dwc3
hisilicon,hi3798mv100-usb2-phy
hisilicon,hip04-clock
hisilicon,hip04-intc
hisilicon,histb-rng
hisilicon,usbhub
honeywell,hih6130
i2cpcf,8584
ibm,axon-msic
ibm,coherent-platform-facility
ibm,ebc
ibm,fsi2pib
ibm,i2cr-scom
ibm,iic
IBM,lhca
IBM,lhea
IBM,lhea-ethernet
ibm,opal-console-hvsi
ibm,opal-console-raw
ibm,opal-flash
ibm,opal-ipmi
ibm,opal-prd
ibm,opb
ibm,plb3
ibm,plb4
ibm,plb6
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
ibm,tah
idt,82p33811
idt,8v19n850
idt,8v19n851
ingenic,jz4725b-bch
ingenic,jz4740-ecc
ingenic,jz4780-bch
ingenic,x2000h
inside-secure,safexcel-eip197c-mxl
intel,i8259
intel,lgm-asc
invensense,icp10100
invensense,itg3200
invn,mpu3050
isa-m5819p
isa-m5823p
isl,isl12022
isl,isl29028
isl,isl9305
isl,isl9305h
keylargo-media-bay
lantiq,ase-pinctrl
lantiq,dcdc-xrx200
lantiq,gptu-xway
lantiq,icu
lantiq,nand-xway
lantiq,nor
lantiq,pci-xway
lantiq,sflash-falcon
lantiq,vmmc-xway
lantiq,xrx100-pinctrl
lantiq,xrx200a1x-gphy-fw
lantiq,xrx200a2x-gphy-fw
lantiq,xrx200-pinctrl
lantiq,xrx300-pinctrl
linux,spi-loopback-test
liteon,ltr303
lltc,ltc7132
lm87cimt
ltr,ltrf216a
m5819
mailbox-test
marvell,88E1111
marvell,88e1116
marvell,88e1118
marvell,88e1145
marvell,88e1149r
marvell,88e1310
marvell,88E1510
marvell,88E1514
marvell,ap806-system-controller
marvell,armada-3700-rwtm-firmware
marvell,armada-380-ahci
marvell,armada-38x-uart
marvell,cp110-system-controller0
marvell,mv88f6710-pinctrl
marvell,mv88f6720-pinctrl
marvell,mv88f6810-pinctrl
marvell,mv88f6820-pinctrl
marvell,mv88f6828-pinctrl
marvell,mv88f6920-pinctrl
marvell,mv88f6925-pinctrl
marvell,mv88f6928-pinctrl
marvell,pxa1928-gpio
marvell,pxa250-core-clocks
marvell,pxa25x-pinctrl
marvell,pxa270-clocks
marvell,pxa27x-pinctrl
marvell,pxa300-clocks
marvell,pxa-intc
marvell,pxa-timer
max6690
maxim,max20710
maxim,max30208
maxim,max3100
maxim,max31785b
maxim,max6639
maxim,max7318
mediatek,mt6660
mediatek,mt6765-cqdma
mediatek,mt6765-pinctrl
mediatek,mt6779-audio
mediatek,mt6873-dvfsrc
mediatek,mt7620-pci
mediatek,mt7623-moore-pinctrl
mediatek,mt8167-disp-aal
mediatek,mt8167-disp-ccorr
mediatek,mt8167-disp-dither
mediatek,mt8167-disp-gamma
mediatek,mt8167-disp-ovl
mediatek,mt8167-disp-rdma
mediatek,mt8176
mediatek,mt817x
mediatek,mt8183-audiosys
mediatek,mt8183-dvfsrc
mediatek,mt8188-vpp-mutex
mediatek,mt8192-dvfsrc
microchip,lan9354-mdio
microchip,pic32mzda-infra
microchip,sama7g5-ohci
microchip,sama7g5-sdhci
microcrystal,rv2123
moxa,moxart-ic
moxa,moxart-mdio
moxa,moxart-rtl8201cp
mpc5200b-fec-phy
mpc5200-serial
mpc5200-sram
mps,mp2629_adc
mps,mp2629_charger
mps,mp5023
mrvl,pwri2c
mti,ranchu
national,lm64
national,lm85b
national,lm85c
national,lm95235
national,lm95245
national,lm96163
nintendo,latte-exi
nvidia,tegra114-apbdma
nvidia,tegra114-kbc
nvidia,tegra114-mc
nvidia,tegra124-mipi
nvidia,tegra132-emc
nvidia,tegra132-mc
nvidia,tegra132-mipi
nvidia,tegra132-pmc
nvidia,tegra148-apbdma
nvidia,tegra194-hte-test
nvidia,tegra210-ictlr
nvidia,tegra210-mc
nvidia,tegra239-ccplex-cluster
nvidia,tegra30-apbdma
nvidia,tegra30-kbc
nxp,isp1707
nxp,rtc-pcf2123
nxp,uda1380
ohare-media-bay
ohare-swim3
ohci-bigendian
ohci-le
ohci-littledian
omapdss,composite-video-connector
omapdss,dvi-connector
omapdss,hdmi-connector
omapdss,lgphilips,lb035q02
omapdss,nec,nl8048hl11
omapdss,panel-dpi
omapdss,panel-dsi-cm
omapdss,sharp,ls037v7dw01
omapdss,sony,acx565akm
omapdss,svideo-connector
omapdss,ti,opa362
omapdss,ti,tfp410
omapdss,ti,tpd12s015
omapdss,toppoly,td028ttec1
omapdss,tpo,td028ttec1
omapdss,tpo,td043mtea1
onnn,nct214
onnn,nct218
onnn,nct72
onnn,pca9655
opencores,ocfb
pasemi,localbus
pasemi,localbus-nand
pasemi,pwrficient-rng
pasemi,sdc
pciex108e,80f0
phytec,pcm030-audio-fabric
picochip,pc3x2-rtc
picochip,pc3x2-timer
pmem-region-v2
ppc4xx-rng
qca,qca9530-pll
qca,qca9560-pll
qcom,adreno-3xx
qcom,gcc-mdm9615
qcom,kgsl-3d0
qcom,mdss_mdp
qcom,sc7180-ipa-virt
qcom,sc7180-qmp-usb3-phy
qcom,sc8180x-dpu
qcom,sc8180x-ipa-virt
qcom,sc8180x-mdss
qcom,sc8180x-qmp-usb3-phy
qcom,sdm845-qmp-usb3-phy
qcom,sdx55-ipa-virt
qcom,sm8150-camnoc-virt
qcom,sm8150-ipa-virt
qcom,sm8150-qmp-usb3-phy
qcom,sm8250-ipa-virt
qcom,sm8250-qmp-usb3-phy
qcom,sm8350-qmp-gen3x2-pcie-phy
qcom,sm8350-qmp-usb3-phy
qcom,sm8450-qmp-usb3-phy
qcom,usb-snps-femto-v2-phy
qt1070
ralink,mt7620a-memc
ralink,rt2880-memc
ralink,rt2880-pinmux
ralink,rt2880-reset
ralink,rt288x-pci
ralink,rt3050-memc
ralink,rt3883-memc
raspberrypi,sensehat-joystick
realtek,rt1305
realtek,rt1306
regulator-virtual-consumer
renesas,cmt-48
renesas,cmt-48-gen2
renesas,mlp
rockchip,rk3366-tsadc
rohm,bh1780gli
sab82532
sgx,vz89te
sgy,gpio-halt
silabs,si544a
silabs,si544c
smsc,emc6d100
smsc,emc6d101
smsc,emc6d102
smsc,emc6d103
smsc,emc6d103s
smsc,lan91c94
smu-sat
snps,archs-timer-gfrc
snps,archs-timer-rtc
socionext,mn884433
socionext,mn884434-0
socionext,mn884434-1
sprd,sc9860-dwc3
sprd,sc9860-suspend-timer
st,6556002
stericsson,ab8500-ponkey
st-ericsson,u8540
st-ericsson,u9540
st,iis2mdc
st,nomadik-src-clock
st,pm6764tr
st,rv4162
st,spear-plgpio
st,st21nfca_i2c
st,st21nfcb_i2c
st,sta529
st,stih407-compositor
st,stih407-flash-pinctrl
st,stih407-front-pinctrl
st,stih407-hda
st,stih407-hdmi
st,stih407-rear-pinctrl
st,stih407-tvout
st,stih416-mpe-thermal
st,sti-pwm
st,stmpe1801
st,stmpe610
st,stw4810
st,stw4811
st,stw481x-vmmc
sun4v
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
swim3
synaptics,synaptics_i2c
tcs,tcs4526
test-device
ti,741g74
ti,am33xx-ecap
ti,am33xx-ehrpwm
ti,bq24157s
ti,cd9200
ti,cd9220
ti,cd9222
ti,cd9224
ti,cd9240
ti,cd9244
ti,cd9246
ti,cd9248
ti,dm6441-mmc
ti,dm814-pllss
ti,dm814-scm
ti,drv2604l
ti,emif-4d5
ti,musb-dm816
ti,omap2420-sdma
ti,omap2430-sdma
ti,omap3430-sdma
ti,omap3630-sdma
ti,omap3-sham
ti,omap5-usb2
ti,omap-infra
ti,tlv320aic23
ti,tps53647
ti,tps53667
ti,tps53681
ti,tps546d24
ti,tps65217-bl
ti,tps65218-gpio
ti,tps80036-pmic
ti,twl4030-power-omap3-evm
ti,twl4030-power-omap3-ldp
ti,twl4030-power-omap3-sdp
ti,ucd9000
ti,ucd90120
ti,ucd90124
ti,ucd90160
ti,ucd9090
ti,ucd90910
toppoly,td028ttec1
toshiba,apb-dummy-codec
ucc_uart
unittest-gpio
unittest-pci
via,vt8500-ehci
virtio,uml
wm,prizm-ehci
wm,wm8750-pinctrl
wrs,epld-localbus
xlnx,axi4-os62420_3pin-1.00.a
xlnx,axi4-os62420_6pin-1.00.a
xlnx,axi-fifo-mm-s-4.1
xlnx,opb-intc-1.00.c
xlnx,plb-dvi-cntlr-ref-1.00.c
xlnx,plb-tft-cntlr-ref-1.00.a
xlnx,xillybus-1.00.a
xlnx,xps-intc-1.00.a
xlnx,xps-ll-temac-1.01.b
xlnx,xps-ll-temac-2.00.a
xlnx,xps-ll-temac-2.02.a
xlnx,xps-ll-temac-2.03.a
xlnx,xps-ps2-1.00.a
xlnx,xps-tft-1.00.a
xlnx,xps-tft-2.00.a
xlnx,xps-tft-2.01.a
xlnx,xps-usb-host-1.00.a
zte,zx296718-reset

On 09/07/2024 22:48, Rob Herring wrote:
> On Tue, Jul 9, 2024 at 11:15 AM Rob Herring <robh@kernel.org> wrote:
>>
>> On Tue, Jul 09, 2024 at 10:44:01AM +0200, Krzysztof Kozlowski wrote:
>>> There is a device in the wild with non-updatable firmware coming with
>>> ACPI tables with rejected "ltr,ltrf216a" compatible.  Linux kernel still
>>> supports this device via ACPI PRP0001, however the compatible was never
>>> accepted to bindings.  Lack of bindings causes checkpatch.pl warning
>>> about undocumented compatible.
>>
>> Why do we care? For checkpatch.pl I really don't. That hack check I
>> wrote makes any string in binding docs a documented compatible. I have a
>> better check using the schema written, but that would make checkpatch
>> dependent on dtschema tools. So maybe just time to drop this check from
>> checkpatch as we have other ways to check and track this.

People still use checkpatch - both to actually test patches before
sending and also to fix random existing issues.

>>
>> However, I do care about 'make dt_compatible_check'. Besides these ACPI
>> cases, there's a bunch of cases that we'll never have schemas for. Like
>> everything from Sparc... Old PowerMac stuff... So I would like to
>> 'document' them just to exclude from dt_compatible_check. So perhaps
>> this should be generalized.

Sure, I can rewrite it to more generic.

> 
> Here's my list of what's really not documented. It's just a grep of
> the bindings of each compatible found by 'make dt_compatible_check'.
> Probably anything with SUNW, ibm, amcc, or mpc5 is never going to be
> documented.
> 
> There are some false positives such as cases documented like "fsl,<chip>-guts".

I'll come with something, maybe incomplete but it could grow later.

Best regards,
Krzysztof