linux-kernel - Re: [PATCH v3 1/2] dt-bindings: clock: Add binding documentation for TI syscon gate clock

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Date:   Wed, 19 Feb 2020 09:39:39 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        <linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH v3 1/2] dt-bindings: clock: Add binding documentation for
 TI syscon gate clock

Hi,

On 19/02/20 8:28 am, Rob Herring wrote:
> On Sat, Feb 15, 2020 at 07:47:23PM +0530, Vignesh Raghavendra wrote:
>> Add dt bindings for TI syscon gate clock driver that is used to control
>> EHRPWM's TimeBase clock (TBCLK) on TI's AM654 SoC.
>>
>> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
>> ---
>>  .../bindings/clock/ti,am654-ehrpwm-tbclk.yaml | 35 +++++++++++++++++++
>>  1 file changed, 35 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml b/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml
>> new file mode 100644
>> index 000000000000..3bf954ecb803
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/ti,am654-ehrpwm-tbclk.yaml
>> @@ -0,0 +1,35 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/clock/ti,am654-ehrpwm-tbclk.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: TI syscon gate clock driver
> 
> Bindings are for h/w blocks, not drivers.
> 

Will drop driver from the title and commit msg

>> +
>> +maintainers:
>> +  - Vignesh Raghavendra <vigneshr@...com>
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - const: ti,am654-ehrpwm-tbclk
>> +      - const: syscon
> 
> Why is this a syscon? Are there other functions or it's just the easy 
> way to get a regmap.
> 

Register that has tbclk enable/disable bit also contains bits to control
other functionalities and would need to be shared. Therefore its modeled
as syscon.

Regards
Vignesh

>> +
>> +  "#clock-cells":
>> +    const: 1
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - "#clock-cells"
>> +  - reg
>> +
>> +examples:
>> +  - |
>> +    ehrpwm_tbclk: syscon@...0 {
>> +        compatible = "ti,am654-ehrpwm-tbclk", "syscon";
>> +        reg = <0x4140 0x18>;
>> +        #clock-cells = <1>;
>> +    };
>> -- 
>> 2.25.0
>>

-- 
Regards
Vignesh