linux-kernel - Re: [PATCH v2 07/12] i2c: riic: Define individual arrays to describe the register offsets

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Date: Fri, 28 Jun 2024 10:32:29 +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 v2 07/12] i2c: riic: Define individual arrays to describe
 the register offsets

Hi, Biju,

On 28.06.2024 08:59, Biju Das wrote:
> Hi Claudiu,
> 
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: Tuesday, June 25, 2024 1:14 PM
>> Subject: [PATCH v2 07/12] i2c: riic: Define individual arrays to describe the register offsets
>>
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Define individual arrays to describe the register offsets. In this way we can describe different IP
>> variants that share the same register offsets but have differences in other characteristics. Commit
>> prepares for the addition of fast mode plus.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>
>> Changes in v2:
>> - none
>>
>>  drivers/i2c/busses/i2c-riic.c | 58 +++++++++++++++++++----------------
>>  1 file changed, 31 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index
>> 9fe007609076..8ffbead95492 100644
>> --- a/drivers/i2c/busses/i2c-riic.c
>> +++ b/drivers/i2c/busses/i2c-riic.c
>> @@ -91,7 +91,7 @@ enum riic_reg_list {
>>  };
>>
>>  struct riic_of_data {
>> -	u8 regs[RIIC_REG_END];
>> +	const u8 *regs;
> 
> 
> Since you are touching this part, can we drop struct and
> Use u8* as device_data instead?

Patch 09/12 "i2c: riic: Add support for fast mode plus" adds a new member
to struct riic_of_data. That new member is needed to differentiate b/w
hardware versions supporting fast mode plus based on compatible.

Keeping struct riic_of_data is necessary (unless I misunderstood your
proposal).

Thank you,
Claudiu Beznea

> 
> ie, replace const struct riic_of_data *info->const u8 *regs in struct riic_dev
> and use .data = riic_rz_xx_regs in of_match_table?
> 
> Cheers,
> Biju
>>  };
>>
>>  struct riic_dev {
>> @@ -531,36 +531,40 @@ static void riic_i2c_remove(struct platform_device *pdev)
>>  	pm_runtime_dont_use_autosuspend(dev);
>>  }
>>
>> +static const u8 riic_rz_a_regs[RIIC_REG_END] = {
>> +	[RIIC_ICCR1] = 0x00,
>> +	[RIIC_ICCR2] = 0x04,
>> +	[RIIC_ICMR1] = 0x08,
>> +	[RIIC_ICMR3] = 0x10,
>> +	[RIIC_ICSER] = 0x18,
>> +	[RIIC_ICIER] = 0x1c,
>> +	[RIIC_ICSR2] = 0x24,
>> +	[RIIC_ICBRL] = 0x34,
>> +	[RIIC_ICBRH] = 0x38,
>> +	[RIIC_ICDRT] = 0x3c,
>> +	[RIIC_ICDRR] = 0x40,
>> +};
>> +
>>  static const struct riic_of_data riic_rz_a_info = {
>> -	.regs = {
>> -		[RIIC_ICCR1] = 0x00,
>> -		[RIIC_ICCR2] = 0x04,
>> -		[RIIC_ICMR1] = 0x08,
>> -		[RIIC_ICMR3] = 0x10,
>> -		[RIIC_ICSER] = 0x18,
>> -		[RIIC_ICIER] = 0x1c,
>> -		[RIIC_ICSR2] = 0x24,
>> -		[RIIC_ICBRL] = 0x34,
>> -		[RIIC_ICBRH] = 0x38,
>> -		[RIIC_ICDRT] = 0x3c,
>> -		[RIIC_ICDRR] = 0x40,
>> -	},
>> +	.regs = riic_rz_a_regs,
>> +};
>> +
>> +static const u8 riic_rz_v2h_regs[RIIC_REG_END] = {
>> +	[RIIC_ICCR1] = 0x00,
>> +	[RIIC_ICCR2] = 0x01,
>> +	[RIIC_ICMR1] = 0x02,
>> +	[RIIC_ICMR3] = 0x04,
>> +	[RIIC_ICSER] = 0x06,
>> +	[RIIC_ICIER] = 0x07,
>> +	[RIIC_ICSR2] = 0x09,
>> +	[RIIC_ICBRL] = 0x10,
>> +	[RIIC_ICBRH] = 0x11,
>> +	[RIIC_ICDRT] = 0x12,
>> +	[RIIC_ICDRR] = 0x13,
>>  };
>>
>>  static const struct riic_of_data riic_rz_v2h_info = {
>> -	.regs = {
>> -		[RIIC_ICCR1] = 0x00,
>> -		[RIIC_ICCR2] = 0x01,
>> -		[RIIC_ICMR1] = 0x02,
>> -		[RIIC_ICMR3] = 0x04,
>> -		[RIIC_ICSER] = 0x06,
>> -		[RIIC_ICIER] = 0x07,
>> -		[RIIC_ICSR2] = 0x09,
>> -		[RIIC_ICBRL] = 0x10,
>> -		[RIIC_ICBRH] = 0x11,
>> -		[RIIC_ICDRT] = 0x12,
>> -		[RIIC_ICDRR] = 0x13,
>> -	},
>> +	.regs = riic_rz_v2h_regs,
>>  };
>>
>>  static int riic_i2c_suspend(struct device *dev)
>> --
>> 2.39.2
>>
>