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@nvidia.com>
Signed-off-by: Kartik Rajput <kkartik@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
---
v4 -> v10:
        * Set has_mst_reset = true for Tegra264.
v1 -> v4:
        * Update commit message to mention the SW mutex feature
          available on Tegra264.
---
 drivers/i2c/busses/i2c-tegra.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 51af857d44d6..0638ccdef313 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1853,7 +1853,40 @@ static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
 	.has_mutex = 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,
+	.has_mst_reset = true,
+	.quirks = &tegra194_i2c_quirks,
+	.supports_bus_clear = true,
+	.has_apb_dma = false,
+	.tlow_std_mode = 0x8,
+	.thigh_std_mode = 0x7,
+	.tlow_fast_mode = 0x2,
+	.thigh_fast_mode = 0x2,
+	.tlow_fastplus_mode = 0x2,
+	.thigh_fastplus_mode = 0x2,
+	.tlow_hs_mode = 0x4,
+	.thigh_hs_mode = 0x2,
+	.setup_hold_time_std_mode = 0x08080808,
+	.setup_hold_time_fast_mode = 0x02020202,
+	.setup_hold_time_fastplus_mode = 0x02020202,
+	.setup_hold_time_hs_mode = 0x090909,
+	.has_interface_timing_reg = true,
+	.enable_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, },
-- 
2.50.1

On Tue, Nov 18, 2025 at 07:36:20PM +0530, Akhil R wrote:
> 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@nvidia.com>
> Signed-off-by: Kartik Rajput <kkartik@nvidia.com>
> Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
> ---
> v4 -> v10:
>         * Set has_mst_reset = true for Tegra264.
> v1 -> v4:
>         * Update commit message to mention the SW mutex feature
>           available on Tegra264.
> ---
>  drivers/i2c/busses/i2c-tegra.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)

Acked-by: Thierry Reding <treding@nvidia.com>