diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 27 |
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index e1d491b0b9c9..242f491cf581 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -434,6 +434,7 @@ config I2C_DESIGNWARE_CORE config I2C_DESIGNWARE_PLATFORM tristate "Synopsys DesignWare Platform" select I2C_DESIGNWARE_CORE + depends on (ACPI && COMMON_CLK) || !ACPI help If you say yes to this option, support will be included for the Synopsys DesignWare I2C adapter. Only master mode is supported. diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index e59c63ae4d41..a7431150acf7 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/clk.h> +#include <linux/clk-provider.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/err.h> @@ -80,6 +81,7 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + const struct acpi_device_id *id; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; @@ -93,9 +95,29 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &dev->sda_hold_time); + /* + * Provide a way for Designware I2C host controllers that are not + * based on Intel LPSS to specify their input clock frequency via + * id->driver_data. + */ + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL, + CLK_IS_ROOT, id->driver_data); + return 0; } +static void dw_i2c_acpi_unconfigure(struct platform_device *pdev) +{ + struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + const struct acpi_device_id *id; + + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_unregister(dev->clk); +} + static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT33C2", 0 }, { "INT33C3", 0 }, @@ -103,6 +125,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT3433", 0 }, { "80860F41", 0 }, { "808622C1", 0 }, + { "AMD0010", 133 * 1000 * 1000 }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); @@ -111,6 +134,7 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev) { return -ENODEV; } +static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { } #endif static int dw_i2c_probe(struct platform_device *pdev) @@ -258,6 +282,9 @@ static int dw_i2c_remove(struct platform_device *pdev) pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); + if (ACPI_COMPANION(&pdev->dev)) + dw_i2c_acpi_unconfigure(pdev); + return 0; } |