linux-kernel - Re: [PATCH v9 4/4] i2c: tegra: Add Tegra264 support

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Message-ID: <cf862356-1ed4-48ca-9d43-7e008a86eef0@nvidia.com>
Date: Fri, 24 Oct 2025 16:43:13 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Kartik Rajput <kkartik@...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, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 4/4] i2c: tegra: Add Tegra264 support


On 01/10/2025 07:47, Kartik Rajput wrote:
> From: Akhil R <akhilrajeev@...dia.com>
> 
> Add support for Tegra264 SoC which supports 17 generic I2C controllers,
> two of which are in the AON (always-on) partition of the SoC. In
> addition to the features supported by Tegra194 it also supports a
> SW mutex register to allow sharing the same I2C instance across
> multiple firmware.
> 
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
> ---
> v1 -> v4:
>          * Update commit message to mention the SW mutex feature
>            available on Tegra264.
> ---
>   drivers/i2c/busses/i2c-tegra.c | 29 +++++++++++++++++++++++++++++
>   1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 1c8c24ae54ed..f324cf3b1f28 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -1814,7 +1814,36 @@ static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
>   	.has_interface_timing_reg = true,
>   };
>   
> +static const struct tegra_i2c_hw_feature tegra264_i2c_hw = {
> +	.has_continue_xfer_support = true,
> +	.has_per_pkt_xfer_complete_irq = true,
> +	.clk_divisor_hs_mode = 1,
> +	.clk_divisor_std_mode = 0x1d,
> +	.clk_divisor_fast_mode = 0x15,
> +	.clk_divisor_fast_plus_mode = 0x8,
> +	.has_config_load_reg = true,
> +	.has_multi_master_mode = true,
> +	.has_slcg_override_reg = true,
> +	.has_mst_fifo = true,
> +	.quirks = &tegra194_i2c_quirks,
> +	.supports_bus_clear = true,
> +	.has_apb_dma = false,
> +	.tlow_std_mode = 0x8,
> +	.thigh_std_mode = 0x7,
> +	.tlow_fast_fastplus_mode = 0x2,
> +	.thigh_fast_fastplus_mode = 0x2,
> +	.tlow_hs_mode = 0x4,
> +	.thigh_hs_mode = 0x2,
> +	.setup_hold_time_std_mode = 0x08080808,
> +	.setup_hold_time_fast_fast_plus_mode = 0x02020202,
> +	.setup_hold_time_hs_mode = 0x090909,
> +	.has_interface_timing_reg = true,
> +	.has_hs_mode_support = true,
> +	.has_mutex = true,
> +};
> +
>   static const struct of_device_id tegra_i2c_of_match[] = {
> +	{ .compatible = "nvidia,tegra264-i2c", .data = &tegra264_i2c_hw, },
>   	{ .compatible = "nvidia,tegra256-i2c", .data = &tegra256_i2c_hw, },
>   	{ .compatible = "nvidia,tegra194-i2c", .data = &tegra194_i2c_hw, },
>   	{ .compatible = "nvidia,tegra186-i2c", .data = &tegra186_i2c_hw, },


Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Jon

-- 
nvpublic