linux-kernel - Re: [PATCH 08/12] dt-bindings: i2c: renesas,riic: Document the R9A08G045 support

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Date: Fri, 21 Jun 2024 15:54:37 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>,
 Chris Brandt <Chris.Brandt@...esas.com>,
 "andi.shyti@...nel.org" <andi.shyti@...nel.org>,
 "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
 <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "geert+renesas@...der.be" <geert+renesas@...der.be>,
 "magnus.damm@...il.com" <magnus.damm@...il.com>,
 "mturquette@...libre.com" <mturquette@...libre.com>,
 "sboyd@...nel.org" <sboyd@...nel.org>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>
Cc: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
 "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 08/12] dt-bindings: i2c: renesas,riic: Document the
 R9A08G045 support



On 21.06.2024 15:34, Biju Das wrote:
> Hi Claudiu,
> 
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: Friday, June 21, 2024 12:23 PM
>> Subject: [PATCH 08/12] dt-bindings: i2c: renesas,riic: Document the R9A08G045 support
>>
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Document the Renesas RZ/G3S (R9A08G045) RIIC IP. This is compatible with the version available on
>> Renesas RZ/V2H (R9A09G075). Most of the IP variants that the RIIC driver is working with supports
>> fast mode plus.
>> However, it happens that on the same SoC to have IP instatiations that support fast mode plus as
>> well as IP instantiation that doesn't support it. For this, introduced the renesas,riic-no-fast-
>> mode-plus property.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>  Documentation/devicetree/bindings/i2c/renesas,riic.yaml | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
>> b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
>> index 91ecf17b7a81..c0964edbca69 100644
>> --- a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
>> +++ b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
>> @@ -25,6 +25,10 @@ properties:
>>                - renesas,riic-r9a07g054  # RZ/V2L
>>            - const: renesas,riic-rz      # RZ/A or RZ/G2L
>>
>> +      - items:
>> +          - const: renesas,riic-r9a08g045   # RZ/G3S
>> +          - const: renesas,riic-r9a09g057
>> +
>>        - const: renesas,riic-r9a09g057   # RZ/V2H(P)
>>
>>    reg:
>> @@ -66,6 +70,10 @@ properties:
>>    resets:
>>      maxItems: 1
>>
>> +  renesas,riic-no-fast-mode-plus:
>> +    description: specifies if fast mode plus is not supported
>> +    type: Boolean
> 
> Can't this info, as part of device data?? Based on frequency and device data
> is enough to derive this info??

We can't rely completely on device data because on RZ/G3S we have 2 RIIC
channels that support fast mode plus and 2 that doesn't support it.

Thank you,
Claudiu Beznea

> 
> Cheers,
> Biju
> 
>> +
>>  required:
>>    - compatible
>>    - reg
>> --
>> 2.39.2
>>
>