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Message-ID: <20260129103043.148490-2-kkartik@nvidia.com>
Date: Thu, 29 Jan 2026 16:00:41 +0530
From: Kartik Rajput <kkartik@...dia.com>
To: <ldewangan@...dia.com>, <digetx@...il.com>, <andi.shyti@...nel.org>,
<thierry.reding@...il.com>, <jonathanh@...dia.com>, <akhilrajeev@...dia.com>,
<smangipudi@...dia.com>, <linux-i2c@...r.kernel.org>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Kartik Rajput <kkartik@...dia.com>
Subject: [PATCH v10 1/3] i2c: tegra: Introduce tegra_i2c_variant to identify DVC and VI
Replace the per-instance DVC/VI boolean flags with a tegra_i2c_variant
enum and move the variant field into tegra_i2c_hw_feature so it is
populated via SoC match data.
Add dedicated SoC data entries for the "nvidia,tegra20-i2c-dvc" and
"nvidia,tegra210-i2c-vi" compatibles and drop compatible-string checks
from tegra_i2c_parse_dt.
Suggested-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Kartik Rajput <kkartik@...dia.com>
---
Changes in v10:
* Suqashed "i2c: tegra: Move variant to tegra_i2c_hw_feature"
with this patch.
---
drivers/i2c/busses/i2c-tegra.c | 112 ++++++++++++++++++++++++++++-----
1 file changed, 95 insertions(+), 17 deletions(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index bec619b9af4e..2ef5fba66b0f 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -171,6 +171,18 @@ enum msg_end_type {
MSG_END_CONTINUE,
};
+/*
+ * tegra_i2c_variant: Identifies the variant of I2C controller.
+ * @TEGRA_I2C_VARIANT_DEFAULT: Identifies the default I2C controller.
+ * @TEGRA_I2C_VARIANT_DVC: Identifies the DVC I2C controller, has a different register layout.
+ * @TEGRA_I2C_VARIANT_VI: Identifies the VI I2C controller, has a different register layout.
+ */
+enum tegra_i2c_variant {
+ TEGRA_I2C_VARIANT_DEFAULT,
+ TEGRA_I2C_VARIANT_DVC,
+ TEGRA_I2C_VARIANT_VI,
+};
+
/**
* struct tegra_i2c_hw_feature : per hardware generation features
* @has_continue_xfer_support: continue-transfer supported
@@ -223,6 +235,7 @@ enum msg_end_type {
* timing settings.
* @enable_hs_mode_support: Enable support for high speed (HS) mode transfers.
* @has_mutex: Has mutex register for mutual exclusion with other firmwares or VMs.
+ * @variant: This represents the I2C controller variant.
*/
struct tegra_i2c_hw_feature {
bool has_continue_xfer_support;
@@ -254,6 +267,7 @@ struct tegra_i2c_hw_feature {
bool has_interface_timing_reg;
bool enable_hs_mode_support;
bool has_mutex;
+ enum tegra_i2c_variant variant;
};
/**
@@ -268,8 +282,6 @@ struct tegra_i2c_hw_feature {
* @base_phys: physical base address of the I2C controller
* @cont_id: I2C controller ID, used for packet header
* @irq: IRQ number of transfer complete interrupt
- * @is_dvc: identifies the DVC I2C controller, has a different register layout
- * @is_vi: identifies the VI I2C controller, has a different register layout
* @msg_complete: transfer completion notifier
* @msg_buf_remaining: size of unsent data in the message buffer
* @msg_len: length of message in current transfer
@@ -321,12 +333,12 @@ struct tegra_i2c_dev {
bool atomic_mode;
bool dma_mode;
bool msg_read;
- bool is_dvc;
- bool is_vi;
};
-#define IS_DVC(dev) (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && (dev)->is_dvc)
-#define IS_VI(dev) (IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC) && (dev)->is_vi)
+#define IS_DVC(dev) (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && \
+ (dev)->hw->variant == TEGRA_I2C_VARIANT_DVC)
+#define IS_VI(dev) (IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC) && \
+ (dev)->hw->variant == TEGRA_I2C_VARIANT_VI)
static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
unsigned int reg)
@@ -1635,7 +1647,41 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
.has_interface_timing_reg = false,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
+};
+
+#if IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC)
+static const struct tegra_i2c_hw_feature tegra20_dvc_i2c_hw = {
+ .has_continue_xfer_support = false,
+ .has_per_pkt_xfer_complete_irq = false,
+ .clk_divisor_hs_mode = 3,
+ .clk_divisor_std_mode = 0,
+ .clk_divisor_fast_mode = 0,
+ .clk_divisor_fast_plus_mode = 0,
+ .has_config_load_reg = false,
+ .has_multi_master_mode = false,
+ .has_slcg_override_reg = false,
+ .has_mst_fifo = false,
+ .has_mst_reset = false,
+ .quirks = &tegra_i2c_quirks,
+ .supports_bus_clear = false,
+ .has_apb_dma = true,
+ .tlow_std_mode = 0x4,
+ .thigh_std_mode = 0x2,
+ .tlow_fast_mode = 0x4,
+ .thigh_fast_mode = 0x2,
+ .tlow_fastplus_mode = 0x4,
+ .thigh_fastplus_mode = 0x2,
+ .setup_hold_time_std_mode = 0x0,
+ .setup_hold_time_fast_mode = 0x0,
+ .setup_hold_time_fastplus_mode = 0x0,
+ .setup_hold_time_hs_mode = 0x0,
+ .has_interface_timing_reg = false,
+ .enable_hs_mode_support = false,
+ .has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DVC,
};
+#endif
static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
.has_continue_xfer_support = true,
@@ -1665,6 +1711,7 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
.has_interface_timing_reg = false,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
@@ -1695,6 +1742,7 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
.has_interface_timing_reg = false,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
@@ -1725,6 +1773,7 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
@@ -1755,7 +1804,41 @@ static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
+};
+
+#if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
+static const struct tegra_i2c_hw_feature tegra210_vi_i2c_hw = {
+ .has_continue_xfer_support = true,
+ .has_per_pkt_xfer_complete_irq = true,
+ .clk_divisor_hs_mode = 1,
+ .clk_divisor_std_mode = 0x19,
+ .clk_divisor_fast_mode = 0x19,
+ .clk_divisor_fast_plus_mode = 0x10,
+ .has_config_load_reg = true,
+ .has_multi_master_mode = false,
+ .has_slcg_override_reg = true,
+ .has_mst_fifo = false,
+ .has_mst_reset = false,
+ .quirks = &tegra_i2c_quirks,
+ .supports_bus_clear = true,
+ .has_apb_dma = true,
+ .tlow_std_mode = 0x4,
+ .thigh_std_mode = 0x2,
+ .tlow_fast_mode = 0x4,
+ .thigh_fast_mode = 0x2,
+ .tlow_fastplus_mode = 0x4,
+ .thigh_fastplus_mode = 0x2,
+ .setup_hold_time_std_mode = 0,
+ .setup_hold_time_fast_mode = 0,
+ .setup_hold_time_fastplus_mode = 0,
+ .setup_hold_time_hs_mode = 0,
+ .has_interface_timing_reg = true,
+ .enable_hs_mode_support = false,
+ .has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_VI,
};
+#endif
static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
.has_continue_xfer_support = true,
@@ -1785,6 +1868,7 @@ static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = false,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
@@ -1817,6 +1901,7 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = true,
.has_mutex = false,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
@@ -1849,6 +1934,7 @@ static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = true,
.has_mutex = true,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct tegra_i2c_hw_feature tegra264_i2c_hw = {
@@ -1881,6 +1967,7 @@ static const struct tegra_i2c_hw_feature tegra264_i2c_hw = {
.has_interface_timing_reg = true,
.enable_hs_mode_support = true,
.has_mutex = true,
+ .variant = TEGRA_I2C_VARIANT_DEFAULT,
};
static const struct of_device_id tegra_i2c_of_match[] = {
@@ -1889,7 +1976,7 @@ static const struct of_device_id tegra_i2c_of_match[] = {
{ .compatible = "nvidia,tegra194-i2c", .data = &tegra194_i2c_hw, },
{ .compatible = "nvidia,tegra186-i2c", .data = &tegra186_i2c_hw, },
#if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
- { .compatible = "nvidia,tegra210-i2c-vi", .data = &tegra210_i2c_hw, },
+ { .compatible = "nvidia,tegra210-i2c-vi", .data = &tegra210_vi_i2c_hw, },
#endif
{ .compatible = "nvidia,tegra210-i2c", .data = &tegra210_i2c_hw, },
{ .compatible = "nvidia,tegra124-i2c", .data = &tegra124_i2c_hw, },
@@ -1897,7 +1984,7 @@ static const struct of_device_id tegra_i2c_of_match[] = {
{ .compatible = "nvidia,tegra30-i2c", .data = &tegra30_i2c_hw, },
{ .compatible = "nvidia,tegra20-i2c", .data = &tegra20_i2c_hw, },
#if IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC)
- { .compatible = "nvidia,tegra20-i2c-dvc", .data = &tegra20_i2c_hw, },
+ { .compatible = "nvidia,tegra20-i2c-dvc", .data = &tegra20_dvc_i2c_hw, },
#endif
{},
};
@@ -1905,21 +1992,12 @@ MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
{
- struct device_node *np = i2c_dev->dev->of_node;
bool multi_mode;
i2c_parse_fw_timings(i2c_dev->dev, &i2c_dev->timings, true);
multi_mode = device_property_read_bool(i2c_dev->dev, "multi-master");
i2c_dev->multimaster_mode = multi_mode;
-
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) &&
- of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc"))
- i2c_dev->is_dvc = true;
-
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC) &&
- of_device_is_compatible(np, "nvidia,tegra210-i2c-vi"))
- i2c_dev->is_vi = true;
}
static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)
--
2.43.0
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