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: Carl Peng <carlpeng008@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 27 insertions, 0 deletions

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;
 }