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

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Date: Fri, 21 Jun 2024 16:06:05 +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 15:56, Biju Das wrote:
> 
> Hi claudiu,
> 
>> -----Original Message-----
>> From: claudiu beznea <claudiu.beznea@...on.dev>
>> Sent: Friday, June 21, 2024 1:55 PM
>> 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.
> 
> Can't array of bits for this channels won't help??

Can you give an example? I'm not sure I understand how you would prefer me
to use the array of bits.

Thank you,
Claudiu Beznea

> Based on the bit info, you have that details and check against frequency defined in DT.
> 
> Cheers,
> Biju