Commit a445900c authored by Carl Peng's avatar Carl Peng Committed by Wolfram Sang

i2c: designware: Add support for AMD I2C controller

Add support for AMD version of the DW I2C host controller. The device is
enumerated from ACPI namespace with ACPI ID AMD0010. Because the core
driver needs an input source clock, and this is not an Intel LPSS device
where clocks are provided through drivers/acpi/acpi_lpss.c, we register the
clock ourselves if the clock rate is given in ->driver_data
Signed-off-by: default avatarCarl Peng <carlpeng008@gmail.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 925ddb24
...@@ -434,6 +434,7 @@ config I2C_DESIGNWARE_CORE ...@@ -434,6 +434,7 @@ config I2C_DESIGNWARE_CORE
config I2C_DESIGNWARE_PLATFORM config I2C_DESIGNWARE_PLATFORM
tristate "Synopsys DesignWare Platform" tristate "Synopsys DesignWare Platform"
select I2C_DESIGNWARE_CORE select I2C_DESIGNWARE_CORE
depends on (ACPI && COMMON_CLK) || !ACPI
help help
If you say yes to this option, support will be included for the If you say yes to this option, support will be included for the
Synopsys DesignWare I2C adapter. Only master mode is supported. Synopsys DesignWare I2C adapter. Only master mode is supported.
......
...@@ -30,6 +30,7 @@ ...@@ -30,6 +30,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/err.h> #include <linux/err.h>
...@@ -80,6 +81,7 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], ...@@ -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) static int dw_i2c_acpi_configure(struct platform_device *pdev)
{ {
struct dw_i2c_dev *dev = platform_get_drvdata(pdev); struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
const struct acpi_device_id *id;
dev->adapter.nr = -1; dev->adapter.nr = -1;
dev->tx_fifo_depth = 32; dev->tx_fifo_depth = 32;
...@@ -93,9 +95,29 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) ...@@ -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, dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
&dev->sda_hold_time); &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; 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[] = { static const struct acpi_device_id dw_i2c_acpi_match[] = {
{ "INT33C2", 0 }, { "INT33C2", 0 },
{ "INT33C3", 0 }, { "INT33C3", 0 },
...@@ -103,6 +125,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { ...@@ -103,6 +125,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = {
{ "INT3433", 0 }, { "INT3433", 0 },
{ "80860F41", 0 }, { "80860F41", 0 },
{ "808622C1", 0 }, { "808622C1", 0 },
{ "AMD0010", 133 * 1000 * 1000 },
{ } { }
}; };
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
...@@ -111,6 +134,7 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev) ...@@ -111,6 +134,7 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
{ {
return -ENODEV; return -ENODEV;
} }
static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
#endif #endif
static int dw_i2c_probe(struct platform_device *pdev) static int dw_i2c_probe(struct platform_device *pdev)
...@@ -258,6 +282,9 @@ static int dw_i2c_remove(struct platform_device *pdev) ...@@ -258,6 +282,9 @@ static int dw_i2c_remove(struct platform_device *pdev)
pm_runtime_put(&pdev->dev); pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev); pm_runtime_disable(&pdev->dev);
if (ACPI_COMPANION(&pdev->dev))
dw_i2c_acpi_unconfigure(pdev);
return 0; return 0;
} }
......
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