Re: [PATCH 01/11] dt-bindings: clock: Add RaspberryPi RP1 clock bindings

[Andrea della Porta <andrea.porta@xxxxxxxx>]

Hi Conor,

On 17:19 Tue 20 Aug     , Conor Dooley wrote:
> On Tue, Aug 20, 2024 at 04:36:03PM +0200, Andrea della Porta wrote:
> > Add device tree bindings for the clock generator found in RP1 multi
> > function device, and relative entries in MAINTAINERS file.
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta@xxxxxxxx>
> > ---
> >  .../clock/raspberrypi,rp1-clocks.yaml         | 87 +++++++++++++++++++
> >  MAINTAINERS                                   |  6 ++
> >  include/dt-bindings/clock/rp1.h               | 56 ++++++++++++
> >  3 files changed, 149 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> >  create mode 100644 include/dt-bindings/clock/rp1.h
> > 
> > diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> > new file mode 100644
> > index 000000000000..b27db86d0572
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> > @@ -0,0 +1,87 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/raspberrypi,rp1-clocks.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: RaspberryPi RP1 clock generator
> > +
> > +maintainers:
> > +  - Andrea della Porta <andrea.porta@xxxxxxxx>
> > +
> > +description: |
> > +  The RP1 contains a clock generator designed as three PLLs (CORE, AUDIO,
> > +  VIDEO), and each PLL output can be programmed though dividers to generate
> > +  the clocks to drive the sub-peripherals embedded inside the chipset.
> > +
> > +  Link to datasheet:
> > +  https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
> > +
> > +properties:
> > +  compatible:
> > +    const: raspberrypi,rp1-clocks
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  '#clock-cells':
> > +    description:
> > +      The index in the assigned-clocks is mapped to the output clock as per
> > +      definitions in dt-bindings/clock/rp1.h.
> > +    const: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - '#clock-cells'
> > +  - clocks
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/rp1.h>
> > +
> > +    rp1 {
> > +        #address-cells = <2>;
> > +        #size-cells = <2>;
> > +
> > +        rp1_clocks: clocks@18000 {
> 
> The unit address does not match the reg property. I'm surprised that
> dtc doesn't complain about that.

Agreed. I'll update the address with the reg value in the next release

> 
> > +            compatible = "raspberrypi,rp1-clocks";
> > +            reg = <0xc0 0x40018000 0x0 0x10038>;
> 
> This is a rather oddly specific size. It leads me to wonder if this
> region is inside some sort of syscon area?