| Message ID | 20211217113640.59840-1-tony@atomide.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dt-bindings: clock: Add binding for TI clksel | expand |
On Fri, Dec 17, 2021 at 01:36:40PM +0200, Tony Lindgren wrote: > In order to prepare for fixing lots of devicetree unique_unit_address > warnings for the TI clock nodes, let's add a binding for the clksel > clocks. This allows us to move the overlapping devicetree clocks to be > children of the related clksel nodes. And then we need the reg property > only for the parent clksel node. > > We want to set #clock-cells = <1> in case we ever start parsing the clkcsel > clocks directly using a clksel driver rather than using the existing > component clock drivers and child nodes. We also need to update the clock > drivers to get the IO address from the parent clksel node before updating > the dts files. These will be posted as separate patches. > > Cc: Tero Kristo <kristo@kernel.org> > Signed-off-by: Tony Lindgren <tony@atomide.com> > --- > .../bindings/clock/ti/ti,clksel.yaml | 41 +++++++++++++++++++ > 1 file changed, 41 insertions(+) > create mode 100644 Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml > > diff --git a/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml > new file mode 100644 > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml > @@ -0,0 +1,41 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/clock/ti/ti,clksel.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Binding for TI clksel clock > + > +maintainers: > + - Tony Lindgren <tony@atomide.com> > + > +description: | > + The TI CLKSEL clocks consist of consist of a mux, divider, multiplier and > + gate bits. > + > +properties: > + compatible: > + const: ti,clksel > + > + reg: > + maxItems: 1 > + description: The CLKSEL register > + > + "#clock-cells": > + const: 1 > + > +required: > + - compatible > + - reg > + - "#clock-cells" > + > +additionalProperties: true Like what properties? true is only used for common, incomplete schemas referenced by device schemas. > + > +examples: > + - | > + clksel_gfx_fclk: clock@52c { > + compatible = "ti,clksel"; > + reg = <0x25c 0x4>; > + #clock-cells = <1>; > + }; > +... > -- > 2.34.1 >
Hi, * Rob Herring <robh@kernel.org> [211221 18:13]: > On Fri, Dec 17, 2021 at 01:36:40PM +0200, Tony Lindgren wrote: > > +additionalProperties: true > > Like what properties? > > true is only used for common, incomplete schemas referenced by device > schemas. There is a collection of the current component clock child nodes for each clksel instance. I got warnings with "additionalProperties: false", but maybe the child clock nodes need to be somehow specified in the binding? For example, below is a sample patch for am335x CLKSEL_GFX_FCLK using a clksel parent node with the child nodes moved to fix warnings for unique_unit_address. It also has clock-output-names property added to avoid the node naming warnings. For the other clksel instances, they can be a collection of dividers, multipliers, gates and muxes. Regards, Tony 8< -------- diff --git a/arch/arm/boot/dts/am33xx-clocks.dtsi b/arch/arm/boot/dts/am33xx-clocks.dtsi --- a/arch/arm/boot/dts/am33xx-clocks.dtsi +++ b/arch/arm/boot/dts/am33xx-clocks.dtsi @@ -494,20 +494,27 @@ mmc_clk: mmc_clk { clock-div = <2>; }; - gfx_fclk_clksel_ck: gfx_fclk_clksel_ck@52c { - #clock-cells = <0>; - compatible = "ti,mux-clock"; - clocks = <&dpll_core_m4_ck>, <&dpll_per_m2_ck>; - ti,bit-shift = <1>; - reg = <0x052c>; - }; + clock@52c { + compatible = "ti,clksel"; + reg = <0x52c>; + #clock-cells = <1>; + #address-cells = <0>; + + gfx_fclk_clksel_ck: clock-gfx-fclk-clksel { + #clock-cells = <0>; + compatible = "ti,mux-clock"; + clock-output-names = "gfx_fclk_clksel_ck"; + clocks = <&dpll_core_m4_ck>, <&dpll_per_m2_ck>; + ti,bit-shift = <1>; + }; - gfx_fck_div_ck: gfx_fck_div_ck@52c { - #clock-cells = <0>; - compatible = "ti,divider-clock"; - clocks = <&gfx_fclk_clksel_ck>; - reg = <0x052c>; - ti,max-div = <2>; + gfx_fck_div_ck: clock-gfx-fck-div { + #clock-cells = <0>; + compatible = "ti,divider-clock"; + clock-output-names = "gfx_fck_div_ck"; + clocks = <&gfx_fclk_clksel_ck>; + ti,max-div = <2>; + }; }; sysclkout_pre_ck: sysclkout_pre_ck@700 {
On Wed, Dec 22, 2021 at 12:24 AM Tony Lindgren <tony@atomide.com> wrote: > > Hi, > > * Rob Herring <robh@kernel.org> [211221 18:13]: > > On Fri, Dec 17, 2021 at 01:36:40PM +0200, Tony Lindgren wrote: > > > +additionalProperties: true > > > > Like what properties? > > > > true is only used for common, incomplete schemas referenced by device > > schemas. > > There is a collection of the current component clock child nodes for each > clksel instance. I got warnings with "additionalProperties: false", but > maybe the child clock nodes need to be somehow specified in the binding? If everything else is a child node, then you can do: additionalProperties: type: object > > For example, below is a sample patch for am335x CLKSEL_GFX_FCLK using a > clksel parent node with the child nodes moved to fix warnings for > unique_unit_address. It also has clock-output-names property added to > avoid the node naming warnings. For the other clksel instances, they can > be a collection of dividers, multipliers, gates and muxes. > > Regards, > > Tony > > 8< -------- > diff --git a/arch/arm/boot/dts/am33xx-clocks.dtsi b/arch/arm/boot/dts/am33xx-clocks.dtsi > --- a/arch/arm/boot/dts/am33xx-clocks.dtsi > +++ b/arch/arm/boot/dts/am33xx-clocks.dtsi > @@ -494,20 +494,27 @@ mmc_clk: mmc_clk { > clock-div = <2>; > }; > > - gfx_fclk_clksel_ck: gfx_fclk_clksel_ck@52c { > - #clock-cells = <0>; > - compatible = "ti,mux-clock"; > - clocks = <&dpll_core_m4_ck>, <&dpll_per_m2_ck>; > - ti,bit-shift = <1>; > - reg = <0x052c>; > - }; > + clock@52c { > + compatible = "ti,clksel"; > + reg = <0x52c>; > + #clock-cells = <1>; > + #address-cells = <0>; > + > + gfx_fclk_clksel_ck: clock-gfx-fclk-clksel { > + #clock-cells = <0>; > + compatible = "ti,mux-clock"; > + clock-output-names = "gfx_fclk_clksel_ck"; > + clocks = <&dpll_core_m4_ck>, <&dpll_per_m2_ck>; > + ti,bit-shift = <1>; > + }; > > - gfx_fck_div_ck: gfx_fck_div_ck@52c { > - #clock-cells = <0>; > - compatible = "ti,divider-clock"; > - clocks = <&gfx_fclk_clksel_ck>; > - reg = <0x052c>; > - ti,max-div = <2>; > + gfx_fck_div_ck: clock-gfx-fck-div { > + #clock-cells = <0>; > + compatible = "ti,divider-clock"; > + clock-output-names = "gfx_fck_div_ck"; > + clocks = <&gfx_fclk_clksel_ck>; > + ti,max-div = <2>; > + }; > }; > > sysclkout_pre_ck: sysclkout_pre_ck@700 {
* Rob Herring <robh@kernel.org> [220104 22:06]: > On Wed, Dec 22, 2021 at 12:24 AM Tony Lindgren <tony@atomide.com> wrote: > > > > Hi, > > > > * Rob Herring <robh@kernel.org> [211221 18:13]: > > > On Fri, Dec 17, 2021 at 01:36:40PM +0200, Tony Lindgren wrote: > > > > +additionalProperties: true > > > > > > Like what properties? > > > > > > true is only used for common, incomplete schemas referenced by device > > > schemas. > > > > There is a collection of the current component clock child nodes for each > > clksel instance. I got warnings with "additionalProperties: false", but > > maybe the child clock nodes need to be somehow specified in the binding? > > If everything else is a child node, then you can do: > > additionalProperties: > type: object OK thanks will do, the additional properties are always child nodes. Regards, Tony
diff --git a/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml new file mode 100644 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml @@ -0,0 +1,41 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/ti/ti,clksel.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Binding for TI clksel clock + +maintainers: + - Tony Lindgren <tony@atomide.com> + +description: | + The TI CLKSEL clocks consist of consist of a mux, divider, multiplier and + gate bits. + +properties: + compatible: + const: ti,clksel + + reg: + maxItems: 1 + description: The CLKSEL register + + "#clock-cells": + const: 1 + +required: + - compatible + - reg + - "#clock-cells" + +additionalProperties: true + +examples: + - | + clksel_gfx_fclk: clock@52c { + compatible = "ti,clksel"; + reg = <0x25c 0x4>; + #clock-cells = <1>; + }; +...
In order to prepare for fixing lots of devicetree unique_unit_address warnings for the TI clock nodes, let's add a binding for the clksel clocks. This allows us to move the overlapping devicetree clocks to be children of the related clksel nodes. And then we need the reg property only for the parent clksel node. We want to set #clock-cells = <1> in case we ever start parsing the clkcsel clocks directly using a clksel driver rather than using the existing component clock drivers and child nodes. We also need to update the clock drivers to get the IO address from the parent clksel node before updating the dts files. These will be posted as separate patches. Cc: Tero Kristo <kristo@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- .../bindings/clock/ti/ti,clksel.yaml | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml