From bd2fdedbf2bac27f4a2ac16b84ab9b9e5f67006c Mon Sep 17 00:00:00 2001 From: Akhil R Date: Thu, 25 Nov 2021 22:23:44 +0530 Subject: [PATCH] i2c: tegra: Add the ACPI support Add support for the ACPI based device registration so that the driver can be also enabled through ACPI table. This does not include the ACPI support for Tegra VI and DVC I2C. Signed-off-by: Akhil R Reviewed-by: Dmitry Osipenko Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-tegra.c | 52 ++++++++++++++++++++++++++-------- 1 file changed, 40 insertions(+), 12 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index b3184c422826a..56c9c02821c2c 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -6,6 +6,7 @@ * Author: Colin Cross */ +#include #include #include #include @@ -608,6 +609,7 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev) static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) { u32 val, clk_divisor, clk_multiplier, tsu_thd, tlow, thigh, non_hs_mode; + acpi_handle handle = ACPI_HANDLE(i2c_dev->dev); int err; /* @@ -618,7 +620,11 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) * emit a noisy warning on error, which won't stay unnoticed and * won't hose machine entirely. */ - err = reset_control_reset(i2c_dev->rst); + if (handle) + err = acpi_evaluate_object(handle, "_RST", NULL, NULL); + else + err = reset_control_reset(i2c_dev->rst); + WARN_ON_ONCE(err); if (i2c_dev->is_dvc) @@ -1627,12 +1633,12 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev) bool multi_mode; int err; - err = of_property_read_u32(np, "clock-frequency", - &i2c_dev->bus_clk_rate); + err = device_property_read_u32(i2c_dev->dev, "clock-frequency", + &i2c_dev->bus_clk_rate); if (err) i2c_dev->bus_clk_rate = I2C_MAX_STANDARD_MODE_FREQ; - multi_mode = of_property_read_bool(np, "multi-master"); + multi_mode = device_property_read_bool(i2c_dev->dev, "multi-master"); i2c_dev->multimaster_mode = multi_mode; if (of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc")) @@ -1642,10 +1648,26 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev) i2c_dev->is_vi = true; } +static int tegra_i2c_init_reset(struct tegra_i2c_dev *i2c_dev) +{ + if (ACPI_HANDLE(i2c_dev->dev)) + return 0; + + i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c"); + if (IS_ERR(i2c_dev->rst)) + return dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst), + "failed to get reset control\n"); + + return 0; +} + static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev) { int err; + if (ACPI_HANDLE(i2c_dev->dev)) + return 0; + i2c_dev->clocks[i2c_dev->nclocks++].id = "div-clk"; if (i2c_dev->hw == &tegra20_i2c_hw || i2c_dev->hw == &tegra30_i2c_hw) @@ -1720,7 +1742,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) init_completion(&i2c_dev->msg_complete); init_completion(&i2c_dev->dma_complete); - i2c_dev->hw = of_device_get_match_data(&pdev->dev); + i2c_dev->hw = device_get_match_data(&pdev->dev); i2c_dev->cont_id = pdev->id; i2c_dev->dev = &pdev->dev; @@ -1746,15 +1768,12 @@ static int tegra_i2c_probe(struct platform_device *pdev) if (err) return err; - i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c"); - if (IS_ERR(i2c_dev->rst)) { - dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst), - "failed to get reset control\n"); - return PTR_ERR(i2c_dev->rst); - } - tegra_i2c_parse_dt(i2c_dev); + err = tegra_i2c_init_reset(i2c_dev); + if (err) + return err; + err = tegra_i2c_init_clocks(i2c_dev); if (err) return err; @@ -1923,12 +1942,21 @@ static const struct dev_pm_ops tegra_i2c_pm = { NULL) }; +static const struct acpi_device_id tegra_i2c_acpi_match[] = { + {.id = "NVDA0101", .driver_data = (kernel_ulong_t)&tegra210_i2c_hw}, + {.id = "NVDA0201", .driver_data = (kernel_ulong_t)&tegra186_i2c_hw}, + {.id = "NVDA0301", .driver_data = (kernel_ulong_t)&tegra194_i2c_hw}, + { } +}; +MODULE_DEVICE_TABLE(acpi, tegra_i2c_acpi_match); + static struct platform_driver tegra_i2c_driver = { .probe = tegra_i2c_probe, .remove = tegra_i2c_remove, .driver = { .name = "tegra-i2c", .of_match_table = tegra_i2c_of_match, + .acpi_match_table = tegra_i2c_acpi_match, .pm = &tegra_i2c_pm, }, }; -- 2.30.2