linux-kernel - [PATCH v8 4/4] i2c: tegra: Add Tegra264 support

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Message-ID: <20250917085650.594279-5-kkartik@nvidia.com>
Date: Wed, 17 Sep 2025 14:26:50 +0530
From: Kartik Rajput <kkartik@...dia.com>
To: <akhilrajeev@...dia.com>, <andi.shyti@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <thierry.reding@...il.com>,
	<jonathanh@...dia.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>
CC: <kkartik@...dia.com>
Subject: [PATCH v8 4/4] i2c: tegra: Add Tegra264 support

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 a2119b8bcc1d..cc9aa7f008eb 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1804,7 +1804,36 @@ 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, },
-- 
2.43.0