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charset=UTF-8 Content-Transfer-Encoding: 8bit On 26/02/2024 13:27, Paweł Anikiel wrote: > On Mon, Feb 26, 2024 at 1:07 PM Krzysztof Kozlowski > wrote: >> >> On 26/02/2024 12:09, Paweł Anikiel wrote: >>> On Mon, Feb 26, 2024 at 10:15 AM Krzysztof Kozlowski >>> wrote: >>>> >>>> On 21/02/2024 17:02, Paweł Anikiel wrote: >>>>> Add device nodes for the video system present on the Chameleon v3. >>>>> It consists of six framebuffers and two Intel Displayport receivers. >>>>> >>>>> Signed-off-by: Paweł Anikiel >>>>> --- >>>> >>>> ... >>>> >>>>> + dprx_sst: dp-receiver@c0064000 { >>>>> + compatible = "intel,dprx-20.0.1"; >>>>> + reg = <0xc0064000 0x800>; >>>>> + interrupt-parent = <&dprx_sst_irq>; >>>>> + interrupts = <0 IRQ_TYPE_EDGE_RISING>; >>>>> + intel,max-link-rate = <0x1e>; >>>> >>>> Rate is not in hex! Rate is in Hz, at least usually... >>>> >>>> Fix your bindings... >>> >>> This is the DisplayPort link rate, for which the allowed values are >>> 8.1 Gbps, 5.4 Gbps, 2.7 Gbps, or 1.62 Gbps. The standard way to encode >>> them (used in the DisplayPort DPCD registers and this device's >> >> Then it is in bps or some other units: >> >> https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml >> >>> configuration) is by multiples of 0.27Gbps. This value (AFAIK) is >>> usually represented in hex, so 8.1Gbps would be 0x1e. >> >> No, the value is represented in logical units. Frequency in Hz. Rate in >> bps/kbps/etc. Voltage in volts. > > Okay, thanks for the info. So if I understand correctly, the max link > rate should be represented in bps in the devicetree, and then be or kbps > converted to the per 0.27Gbps value by the driver? If driver needs some register-based value, then yes. > > One problem is that the values here are too large to be represented in > bps (since the datatype is uint32). Can the property be in Mbps > instead? Can be. You can submit a patch to dtschema (patch to DT spec list or github pull request) adding '-mbps' as well. Best regards, Krzysztof