linux-kernel - Re: [PATCH 1/2] i2c: tegra: Add logic to support different register offsets

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Message-ID: <75cb233c-8089-4da7-b7c1-1b229e2b5931@nvidia.com>
Date: Thu, 6 Nov 2025 13:36:13 +0530
From: Kartik Rajput <kkartik@...dia.com>
To: Jon Hunter <jonathanh@...dia.com>, akhilrajeev@...dia.com,
 andi.shyti@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, thierry.reding@...il.com, ldewangan@...dia.com,
 digetx@...il.com, smangipudi@...dia.com, linux-i2c@...r.kernel.org,
 devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c: tegra: Add logic to support different register
 offsets

On 06/11/25 13:29, Jon Hunter wrote:
> 
> On 01/10/2025 16:36, Kartik Rajput wrote:
>> Tegra410 use different offsets for existing I2C registers, update
>> the logic to use appropriate offsets per SoC.
>>
>> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
>> ---
>>   drivers/i2c/busses/i2c-tegra.c | 499 ++++++++++++++++++++++-----------
>>   1 file changed, 334 insertions(+), 165 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
>> index 038809264526..1e26d67cbd30 100644
>> --- a/drivers/i2c/busses/i2c-tegra.c
>> +++ b/drivers/i2c/busses/i2c-tegra.c
> 
> ...
> 
>>   /*
>>    * msg_end_type: The bus control which needs to be sent at end of transfer.
>>    * @MSG_END_STOP: Send stop pulse.
>> @@ -219,6 +322,9 @@ enum msg_end_type {
>>    *        timing settings.
>>    * @has_hs_mode_support: Has support for high speed (HS) mode transfers.
>>    * @has_mutex: Has mutex register for mutual exclusion with other firmwares or VMs.
>> + * @is_dvc: This instance represents the DVC I2C controller variant.
>> + * @is_vi: This instance represents the VI I2C controller variant.
>> + * @regs: Register offsets for the specific SoC variant.
>>    */
>>   struct tegra_i2c_hw_feature {
>>       bool has_continue_xfer_support;
>> @@ -247,6 +353,9 @@ struct tegra_i2c_hw_feature {
>>       bool has_interface_timing_reg;
>>       bool has_hs_mode_support;
>>       bool has_mutex;
>> +    bool is_dvc;
>> +    bool is_vi;
>> +    const struct tegra_i2c_regs *regs;
>>   };
> 
> 
> I think it could be better to have a 'variant' flag for these is_dvc and is_vi variables because they are mutually exclusive.
> 
> Jon
> 

Ack, I will use a flag for 'is_dvc' and 'is_vi' in the next version.

Thanks,
Kartik