linux-kernel - [PATCH 2/2] i2c: tegra: Add Tegra256 support

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Message-ID: <20250731091122.53921-3-akhilrajeev@nvidia.com>
Date: Thu, 31 Jul 2025 14:41:22 +0530
From: Akhil R <akhilrajeev@...dia.com>
To: <andi.shyti@...nel.org>, <conor+dt@...nel.org>,
	<devicetree@...r.kernel.org>, <digetx@...il.com>, <jonathanh@...dia.com>,
	<krzk+dt@...nel.org>, <linux-i2c@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<thierry.reding@...il.com>
CC: <akhilrajeev@...dia.com>, <ldewangan@...dia.com>, <robh@...nel.org>
Subject: [PATCH 2/2] i2c: tegra: Add Tegra256 support

Add compatible and the hardware struct for Tegra256. Tegra256 controllers
use a different parent clock. Hence the timing parameters are different
from the previous generations to meet the expected frequencies.

Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4eb31b913c1a..e533460bccc3 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1649,7 +1649,33 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
 	.has_interface_timing_reg = true,
 };
 
+static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
+	.has_continue_xfer_support = true,
+	.has_per_pkt_xfer_complete_irq = true,
+	.clk_divisor_hs_mode = 7,
+	.clk_divisor_std_mode = 0x7a,
+	.clk_divisor_fast_mode = 0x40,
+	.clk_divisor_fast_plus_mode = 0x19,
+	.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_fastplus_mode = 0x3,
+	.thigh_fast_fastplus_mode = 0x3,
+	.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,
+};
+
 static const struct of_device_id tegra_i2c_of_match[] = {
+	{ .compatible = "nvidia,tegra256-i2c", .data = &tegra256_i2c_hw, },
 	{ .compatible = "nvidia,tegra194-i2c", .data = &tegra194_i2c_hw, },
 	{ .compatible = "nvidia,tegra186-i2c", .data = &tegra186_i2c_hw, },
 #if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
-- 
2.50.1