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Message-ID: <cabd7cbb2746bcf64f8fd8f8948cab54f1b148ef.camel@intel.com>
Date: Fri, 16 Jul 2021 21:22:10 +0000
From: "Winiarska, Iwona" <iwona.winiarska@...el.com>
To: "robh@...nel.org" <robh@...nel.org>
CC: "corbet@....net" <corbet@....net>,
"jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
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"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
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Subject: Re: [PATCH 04/14] dt-bindings: Add bindings for peci-aspeed
On Thu, 2021-07-15 at 10:28 -0600, Rob Herring wrote:
> On Tue, Jul 13, 2021 at 12:04:37AM +0200, Iwona Winiarska wrote:
> > Add device tree bindings for the peci-aspeed controller driver.
> >
> > Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
> > ---
> > .../devicetree/bindings/peci/peci-aspeed.yaml | 111 ++++++++++++++++++
> > 1 file changed, 111 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.yaml b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml
> > new file mode 100644
> > index 000000000000..6061e06009fb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml
> > @@ -0,0 +1,111 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/peci/peci-aspeed.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Aspeed PECI Bus Device Tree Bindings
> > +
> > +maintainers:
> > + - Iwona Winiarska <iwona.winiarska@...el.com>
> > + - Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > +
> > +allOf:
> > + - $ref: peci-controller.yaml#
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - aspeed,ast2400-peci
> > + - aspeed,ast2500-peci
> > + - aspeed,ast2600-peci
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + description: |
> > + Clock source for PECI controller. Should reference the external
> > + oscillator clock.
> > + maxItems: 1
> > +
> > + resets:
> > + maxItems: 1
> > +
> > + clock-divider:
> > + description: This value determines PECI controller internal clock
> > + dividing rate. The divider will be calculated as 2 raised to the
> > + power of the given value.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 0
> > + maximum: 7
> > + default: 0
> > +
>
> > + msg-timing:
> > + description: |
> > + Message timing negotiation period. This value will determine the period
> > + of message timing negotiation to be issued by PECI controller. The unit
> > + of the programmed value is four times of PECI clock period.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 0
> > + maximum: 255
> > + default: 1
> > +
> > + addr-timing:
> > + description: |
> > + Address timing negotiation period. This value will determine the period
> > + of address timing negotiation to be issued by PECI controller. The unit
> > + of the programmed value is four times of PECI clock period.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 0
> > + maximum: 255
> > + default: 1
> > +
> > + rd-sampling-point:
> > + description: |
> > + Read sampling point selection. The whole period of a bit time will be
> > + divided into 16 time frames. This value will determine the time frame
> > + in which the controller will sample PECI signal for data read back.
> > + Usually in the middle of a bit time is the best.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 0
> > + maximum: 15
> > + default: 8
> > +
> > + cmd-timeout-ms:
> > + description: |
> > + Command timeout in units of ms.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 1
> > + maximum: 1000
> > + default: 1000
>
> Are all of these properties common for PECI or specific to this
> controller? The former needs to go into the common schema. The latter
> need vendor prefixes.
>
The latter, I'll add vendor prefixes in v2.
Thank you
-Iwona
>
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > + - resets
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/clock/ast2600-clock.h>
> > + peci-controller@...8b000 {
> > + compatible = "aspeed,ast2600-peci";
> > + reg = <0x1e78b000 0x100>;
> > + interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&syscon ASPEED_CLK_GATE_REF0CLK>;
> > + resets = <&syscon ASPEED_RESET_PECI>;
> > + clock-divider = <0>;
> > + msg-timing = <1>;
> > + addr-timing = <1>;
> > + rd-sampling-point = <8>;
> > + cmd-timeout-ms = <1000>;
> > + };
> > +...
> > --
> > 2.31.1
> >
> >
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