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

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Date: Fri, 21 Jun 2024 13:10:54 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Claudiu.Beznea <claudiu.beznea@...on.dev>, 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



> -----Original Message-----
> From: claudiu beznea <claudiu.beznea@...on.dev>
> Sent: Friday, June 21, 2024 2:06 PM
 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.

struct riic_of_data {
	u8 regs[RIIC_REG_END];
	u16 fast_mode_info info; /* 1 means fast mode plus supported, starting with channel 0*/
};

.info = 0x3, means channel 0 and 1 has fast mode plus supported
.info = 0x0, none of the channel supported fast mode plus.

Cheers,
Biju