| Message ID | 20240716084248.1393666-3-a-bhatia1@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/tidss: Add OLDI bridge support | expand |
On 16/07/2024 10:42, Aradhya Bhatia wrote: > The OLDI (transmitters) TXes do not have registers of their own, and are > dependent on the source video-ports from the DSS to provide > configuration data. This hardware doesn't directly sit on the internal > bus of the SoC, but does so via the DSS. Hence, the OLDI TXes are > supposed to be child nodes under the DSS, and not independent devices. > > Two of the OLDI TXes can function in tandem to output dual-link OLDI > output, or cloned single-link outputs. In these cases, one OLDI will be > the primary OLDI, and the other one, a companion. > > The OLDI functionality is further supported by a system-control module, > which contains a few registers to control OLDI IO power and > characteristics. > > Add devicetree binding schema for AM625 OLDI TXes. > > Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com> > --- > .../bindings/display/ti/ti,am625-oldi.yaml | 153 ++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 154 insertions(+) > create mode 100644 Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml > > diff --git a/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml > new file mode 100644 > index 000000000000..0a96e600bc0b > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml > @@ -0,0 +1,153 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/display/ti/ti,am625-oldi.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Texas Instruments AM625 OLDI Transmitter > + > +maintainers: > + - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> > + - Aradhya Bhatia <a-bhatia1@ti.com> > + > +description: | Do not need '|' unless you need to preserve formatting. > + The AM625 TI Keystone OpenLDI transmitter (OLDI TX) supports serialized RGB > + pixel data transmission between host and flat panel display over LVDS (Low > + Voltage Differential Sampling) interface. The OLDI TX consists of 7-to-1 data > + serializers, and 4-data and 1-clock LVDS outputs. It supports the LVDS output > + formats "jeida-18", "jeida-24" and "vesa-18", and can accept 24-bit RGB or > + padded and un-padded 18-bit RGB bus formats as input. > + > +properties: > + reg: > + maxItems: 1 > + How does it even work without compatible? How is this schema selected? If by part of your next patch, then this is not a proper split - this patch itself is noop. Squash the patches. > + clocks: > + maxItems: 1 > + description: serial clock input for the OLDI transmitters > + > + clock-names: > + const: s_clk Drop _clk or name it correctly. > + > + ti,companion-oldi: > + $ref: /schemas/types.yaml#/definitions/phandle > + description: > + phandle to companion OLDI transmitter. This property is mandatory for the > + primarty OLDI TX if the OLDI TXes are expected to work either in dual-lvds > + mode or in clone mode. This property should point to the secondary OLDI > + TX. > + > + ti,secondary-oldi: > + type: boolean > + description: Boolean property to mark an OLDI TX as secondary node. Why? Lack companion tells it, doesn't it? > + > + ti,oldi-io-ctrl: > + $ref: /schemas/types.yaml#/definitions/phandle > + description: > + phandle to syscon device node mapping OLDI IO_CTRL registers found in the > + control MMR region. This property is needed for OLDI interface to work. "This property is needed for OLDI interface to work." tells nothing. Everything is needed for everything to work. Be specific. > + > + ports: > + $ref: /schemas/graph.yaml#/properties/ports > + > + properties: > + port@0: > + $ref: /schemas/graph.yaml#/properties/port > + description: Parallel RGB input port > + > + port@1: > + $ref: /schemas/graph.yaml#/properties/port > + description: LVDS output port > + > + required: > + - port@0 > + - port@1 > + > +allOf: > + - if: > + properties: > + ti,secondary-oldi: true This does not work... Test your schema. > + then: > + properties: > + ti,companion-oldi: false > + ti,oldi-io-ctrl: false > + clocks: false > + clock-names: false > + > + else: > + required: > + - ti,oldi-io-ctrl > + - clocks > + - clock-names > + > +required: > + - reg > + - ports > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/soc/ti,sci_pm_domain.h> > + > + oldi_txes { No underscores in node names. Node names should be generic. See also an explanation and list of examples (not exhaustive) in DT specification: https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation > + #address-cells = <1>; > + #size-cells = <0>; > + oldi: oldi@0 { What is the "reg" for? Best regards, Krzysztof
Hi Krzysztof, Thank you for the reviewing the patches. On 7/21/24 21:06, Krzysztof Kozlowski wrote: > On 16/07/2024 10:42, Aradhya Bhatia wrote: >> The OLDI (transmitters) TXes do not have registers of their own, and are >> dependent on the source video-ports from the DSS to provide >> configuration data. This hardware doesn't directly sit on the internal >> bus of the SoC, but does so via the DSS. Hence, the OLDI TXes are >> supposed to be child nodes under the DSS, and not independent devices. >> >> Two of the OLDI TXes can function in tandem to output dual-link OLDI >> output, or cloned single-link outputs. In these cases, one OLDI will be >> the primary OLDI, and the other one, a companion. >> >> The OLDI functionality is further supported by a system-control module, >> which contains a few registers to control OLDI IO power and >> characteristics. >> >> Add devicetree binding schema for AM625 OLDI TXes. >> >> Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com> >> --- >> .../bindings/display/ti/ti,am625-oldi.yaml | 153 ++++++++++++++++++ >> MAINTAINERS | 1 + >> 2 files changed, 154 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >> >> diff --git a/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >> new file mode 100644 >> index 000000000000..0a96e600bc0b >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >> @@ -0,0 +1,153 @@ >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >> +%YAML 1.2 >> +--- >> +$id: http://devicetree.org/schemas/display/ti/ti,am625-oldi.yaml# >> +$schema: http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: Texas Instruments AM625 OLDI Transmitter >> + >> +maintainers: >> + - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> >> + - Aradhya Bhatia <a-bhatia1@ti.com> >> + >> +description: | > > Do not need '|' unless you need to preserve formatting. Okay! > >> + The AM625 TI Keystone OpenLDI transmitter (OLDI TX) supports serialized RGB >> + pixel data transmission between host and flat panel display over LVDS (Low >> + Voltage Differential Sampling) interface. The OLDI TX consists of 7-to-1 data >> + serializers, and 4-data and 1-clock LVDS outputs. It supports the LVDS output >> + formats "jeida-18", "jeida-24" and "vesa-18", and can accept 24-bit RGB or >> + padded and un-padded 18-bit RGB bus formats as input. >> + >> +properties: >> + reg: >> + maxItems: 1 >> + > > How does it even work without compatible? How is this schema selected? > If by part of your next patch, then this is not a proper split - this > patch itself is noop. Squash the patches. > Yes, it is supposed to be picked like the next patch does it. I can squash these both. >> + clocks: >> + maxItems: 1 >> + description: serial clock input for the OLDI transmitters >> + >> + clock-names: >> + const: s_clk > > Drop _clk or name it correctly. Alright! > >> + >> + ti,companion-oldi: >> + $ref: /schemas/types.yaml#/definitions/phandle >> + description: >> + phandle to companion OLDI transmitter. This property is mandatory for the >> + primarty OLDI TX if the OLDI TXes are expected to work either in dual-lvds >> + mode or in clone mode. This property should point to the secondary OLDI >> + TX. >> + >> + ti,secondary-oldi: >> + type: boolean >> + description: Boolean property to mark an OLDI TX as secondary node. > > Why? Lack companion tells it, doesn't it? A lack of companion doesn't mean secondary-OLDI automatically, actually. There is also a possible configuration where 2 OLDI TXes could be individually connected to 2 different sources => 2x single Link configuration. The OLDI TXes would then work independently. > >> + >> + ti,oldi-io-ctrl: >> + $ref: /schemas/types.yaml#/definitions/phandle >> + description: >> + phandle to syscon device node mapping OLDI IO_CTRL registers found in the >> + control MMR region. This property is needed for OLDI interface to work. > > "This property is needed for OLDI interface to work." tells nothing. > Everything is needed for everything to work. Be specific. > Yes! Will fix this. >> + >> + ports: >> + $ref: /schemas/graph.yaml#/properties/ports >> + >> + properties: >> + port@0: >> + $ref: /schemas/graph.yaml#/properties/port >> + description: Parallel RGB input port >> + >> + port@1: >> + $ref: /schemas/graph.yaml#/properties/port >> + description: LVDS output port >> + >> + required: >> + - port@0 >> + - port@1 >> + >> +allOf: >> + - if: >> + properties: >> + ti,secondary-oldi: true > > This does not work... Test your schema. > I tested again just now. At least the schema check didn't report any error. I used the v2024.05 dtschema too. This github gist[0] captures all details of this test. Could you instead please elaborate what maybe wrong here, and I will try to fix that. >> + then: >> + properties: >> + ti,companion-oldi: false >> + ti,oldi-io-ctrl: false >> + clocks: false >> + clock-names: false >> + >> + else: >> + required: >> + - ti,oldi-io-ctrl >> + - clocks >> + - clock-names >> + >> +required: >> + - reg >> + - ports >> + >> +additionalProperties: false >> + >> +examples: >> + - | >> + #include <dt-bindings/soc/ti,sci_pm_domain.h> >> + >> + oldi_txes { > > No underscores in node names. > > Node names should be generic. See also an explanation and list of > examples (not exhaustive) in DT specification: > https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation Right. Will make the name generic. > > >> + #address-cells = <1>; >> + #size-cells = <0>; >> + oldi: oldi@0 { > What is the "reg" for? The reg is for indexing purposes so that the driver can distinguish between which OLDI TX is under question. Since, the syscon controller has different power control registers and bits for different OLDIs - its important for the driver to be able to tell one from another. Regards Aradhya [0]: Github Gist of schema testing for patch 2/4. https://gist.github.com/aradhya07/e3776cb10ee64c33405db5609cbd2e4f
On 26/08/2024 07:47, Aradhya Bhatia wrote: > Hi Krzysztof, > > Thank you for the reviewing the patches. > > > On 7/21/24 21:06, Krzysztof Kozlowski wrote: >> On 16/07/2024 10:42, Aradhya Bhatia wrote: >>> The OLDI (transmitters) TXes do not have registers of their own, and are >>> dependent on the source video-ports from the DSS to provide >>> configuration data. This hardware doesn't directly sit on the internal >>> bus of the SoC, but does so via the DSS. Hence, the OLDI TXes are >>> supposed to be child nodes under the DSS, and not independent devices. >>> >>> Two of the OLDI TXes can function in tandem to output dual-link OLDI >>> output, or cloned single-link outputs. In these cases, one OLDI will be >>> the primary OLDI, and the other one, a companion. >>> >>> The OLDI functionality is further supported by a system-control module, >>> which contains a few registers to control OLDI IO power and >>> characteristics. >>> >>> Add devicetree binding schema for AM625 OLDI TXes. >>> >>> Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com> >>> --- >>> .../bindings/display/ti/ti,am625-oldi.yaml | 153 ++++++++++++++++++ >>> MAINTAINERS | 1 + >>> 2 files changed, 154 insertions(+) >>> create mode 100644 Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >>> >>> diff --git a/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >>> new file mode 100644 >>> index 000000000000..0a96e600bc0b >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml >>> @@ -0,0 +1,153 @@ >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/display/ti/ti,am625-oldi.yaml# >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: Texas Instruments AM625 OLDI Transmitter >>> + >>> +maintainers: >>> + - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> >>> + - Aradhya Bhatia <a-bhatia1@ti.com> >>> + >>> +description: | >> >> Do not need '|' unless you need to preserve formatting. > > Okay! > >> >>> + The AM625 TI Keystone OpenLDI transmitter (OLDI TX) supports serialized RGB >>> + pixel data transmission between host and flat panel display over LVDS (Low >>> + Voltage Differential Sampling) interface. The OLDI TX consists of 7-to-1 data >>> + serializers, and 4-data and 1-clock LVDS outputs. It supports the LVDS output >>> + formats "jeida-18", "jeida-24" and "vesa-18", and can accept 24-bit RGB or >>> + padded and un-padded 18-bit RGB bus formats as input. >>> + >>> +properties: >>> + reg: >>> + maxItems: 1 >>> + >> >> How does it even work without compatible? How is this schema selected? >> If by part of your next patch, then this is not a proper split - this >> patch itself is noop. Squash the patches. >> > > Yes, it is supposed to be picked like the next patch does it. I can > squash these both. > >>> + clocks: >>> + maxItems: 1 >>> + description: serial clock input for the OLDI transmitters >>> + >>> + clock-names: >>> + const: s_clk >> >> Drop _clk or name it correctly. > > Alright! > >> >>> + >>> + ti,companion-oldi: >>> + $ref: /schemas/types.yaml#/definitions/phandle >>> + description: >>> + phandle to companion OLDI transmitter. This property is mandatory for the >>> + primarty OLDI TX if the OLDI TXes are expected to work either in dual-lvds >>> + mode or in clone mode. This property should point to the secondary OLDI >>> + TX. >>> + >>> + ti,secondary-oldi: >>> + type: boolean >>> + description: Boolean property to mark an OLDI TX as secondary node. >> >> Why? Lack companion tells it, doesn't it? > > A lack of companion doesn't mean secondary-OLDI automatically, actually. > > There is also a possible configuration where 2 OLDI TXes could be > individually connected to 2 different sources => 2x single Link > configuration. The OLDI TXes would then work independently. You are responding for something month old. I am not in the context anymore. Probably you miss proper graphs here, not such property. > >> >>> + >>> + ti,oldi-io-ctrl: >>> + $ref: /schemas/types.yaml#/definitions/phandle >>> + description: >>> + phandle to syscon device node mapping OLDI IO_CTRL registers found in the >>> + control MMR region. This property is needed for OLDI interface to work. >> >> "This property is needed for OLDI interface to work." tells nothing. >> Everything is needed for everything to work. Be specific. >> > > Yes! Will fix this. > >>> + >>> + ports: >>> + $ref: /schemas/graph.yaml#/properties/ports >>> + >>> + properties: >>> + port@0: >>> + $ref: /schemas/graph.yaml#/properties/port >>> + description: Parallel RGB input port >>> + >>> + port@1: >>> + $ref: /schemas/graph.yaml#/properties/port >>> + description: LVDS output port >>> + >>> + required: >>> + - port@0 >>> + - port@1 >>> + >>> +allOf: >>> + - if: >>> + properties: >>> + ti,secondary-oldi: true >> >> This does not work... Test your schema. >> > > I tested again just now. At least the schema check didn't report any > error. I used the v2024.05 dtschema too. No, test your condition. Come with DTS with exercises this if. You will see this DOES NOT WORK. This is just no-op, does not perform any useful work. So test the code that it actually performs what you want it to do. > > This github gist[0] captures all details of this test. > > Could you instead please elaborate what maybe wrong here, and I will try > to fix that. Look at example-schema or any of my talks with useful references. > > >>> + then: >>> + properties: >>> + ti,companion-oldi: false >>> + ti,oldi-io-ctrl: false >>> + clocks: false >>> + clock-names: false >>> + >>> + else: >>> + required: >>> + - ti,oldi-io-ctrl >>> + - clocks >>> + - clock-names >>> + >>> +required: >>> + - reg >>> + - ports >>> + >>> +additionalProperties: false >>> + >>> +examples: >>> + - | >>> + #include <dt-bindings/soc/ti,sci_pm_domain.h> >>> + >>> + oldi_txes { >> >> No underscores in node names. >> >> Node names should be generic. See also an explanation and list of >> examples (not exhaustive) in DT specification: >> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation > > Right. Will make the name generic. > >> >> >>> + #address-cells = <1>; >>> + #size-cells = <0>; >>> + oldi: oldi@0 { >> What is the "reg" for? > > The reg is for indexing purposes so that the driver can distinguish > between which OLDI TX is under question. Since, the syscon controller > has different power control registers and bits for different OLDIs - its > important for the driver to be able to tell one from another. Again, not sure, not in context. Patch is not even in the inbox anymore. Best regards, Krzysztof
diff --git a/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml new file mode 100644 index 000000000000..0a96e600bc0b --- /dev/null +++ b/Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml @@ -0,0 +1,153 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/ti/ti,am625-oldi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Texas Instruments AM625 OLDI Transmitter + +maintainers: + - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> + - Aradhya Bhatia <a-bhatia1@ti.com> + +description: | + The AM625 TI Keystone OpenLDI transmitter (OLDI TX) supports serialized RGB + pixel data transmission between host and flat panel display over LVDS (Low + Voltage Differential Sampling) interface. The OLDI TX consists of 7-to-1 data + serializers, and 4-data and 1-clock LVDS outputs. It supports the LVDS output + formats "jeida-18", "jeida-24" and "vesa-18", and can accept 24-bit RGB or + padded and un-padded 18-bit RGB bus formats as input. + +properties: + reg: + maxItems: 1 + + clocks: + maxItems: 1 + description: serial clock input for the OLDI transmitters + + clock-names: + const: s_clk + + ti,companion-oldi: + $ref: /schemas/types.yaml#/definitions/phandle + description: + phandle to companion OLDI transmitter. This property is mandatory for the + primarty OLDI TX if the OLDI TXes are expected to work either in dual-lvds + mode or in clone mode. This property should point to the secondary OLDI + TX. + + ti,secondary-oldi: + type: boolean + description: Boolean property to mark an OLDI TX as secondary node. + + ti,oldi-io-ctrl: + $ref: /schemas/types.yaml#/definitions/phandle + description: + phandle to syscon device node mapping OLDI IO_CTRL registers found in the + control MMR region. This property is needed for OLDI interface to work. + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: Parallel RGB input port + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: LVDS output port + + required: + - port@0 + - port@1 + +allOf: + - if: + properties: + ti,secondary-oldi: true + then: + properties: + ti,companion-oldi: false + ti,oldi-io-ctrl: false + clocks: false + clock-names: false + + else: + required: + - ti,oldi-io-ctrl + - clocks + - clock-names + +required: + - reg + - ports + +additionalProperties: false + +examples: + - | + #include <dt-bindings/soc/ti,sci_pm_domain.h> + + oldi_txes { + #address-cells = <1>; + #size-cells = <0>; + oldi: oldi@0 { + reg = <0>; + clocks = <&k3_clks 186 0>; + clock-names = "s_clk"; + ti,oldi-io-ctrl = <&dss_oldi_io_ctrl>; + ports { + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + oldi_in: endpoint { + remote-endpoint = <&dpi0_out>; + }; + }; + }; + }; + }; + + - | + #include <dt-bindings/soc/ti,sci_pm_domain.h> + + oldi_txes { + #address-cells = <1>; + #size-cells = <0>; + oldi0: oldi@0 { + reg = <0>; + clocks = <&k3_clks 186 0>; + clock-names = "s_clk"; + ti,companion-oldi = <&oldi1>; + ti,oldi-io-ctrl = <&dss_oldi_io_ctrl>; + ports { + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + oldi0_in: endpoint { + remote-endpoint = <&dpi0_out0>; + }; + }; + }; + }; + oldi1: oldi@1 { + reg = <1>; + ti,secondary-oldi; + ports { + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + oldi1_in: endpoint { + remote-endpoint = <&dpi0_out1>; + }; + }; + }; + }; + }; + +... diff --git a/MAINTAINERS b/MAINTAINERS index fb1df8c29f5a..26b1dd3367c5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7642,6 +7642,7 @@ M: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> L: dri-devel@lists.freedesktop.org S: Maintained T: git https://gitlab.freedesktop.org/drm/misc/kernel.git +F: Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml F: Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml F: Documentation/devicetree/bindings/display/ti/ti,j721e-dss.yaml F: Documentation/devicetree/bindings/display/ti/ti,k2g-dss.yaml
The OLDI (transmitters) TXes do not have registers of their own, and are dependent on the source video-ports from the DSS to provide configuration data. This hardware doesn't directly sit on the internal bus of the SoC, but does so via the DSS. Hence, the OLDI TXes are supposed to be child nodes under the DSS, and not independent devices. Two of the OLDI TXes can function in tandem to output dual-link OLDI output, or cloned single-link outputs. In these cases, one OLDI will be the primary OLDI, and the other one, a companion. The OLDI functionality is further supported by a system-control module, which contains a few registers to control OLDI IO power and characteristics. Add devicetree binding schema for AM625 OLDI TXes. Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com> --- .../bindings/display/ti/ti,am625-oldi.yaml | 153 ++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 154 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/ti/ti,am625-oldi.yaml