i2c: designware: Get rid of PCI driver specifics in common code

Do not spread PCI specifics over common code. It seems to be a layering
violation which can be easily avoided. Refactor PCI driver and drop
PCI specifics from common code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-core.h

@@ -232,7 +232,6 @@ struct dw_i2c_dev {
 	struct reset_control	*rst;
 	struct i2c_client		*slave;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
-	struct dw_pci_controller *controller;
 	int			cmd_err;
 	struct i2c_msg		*msgs;
 	int			msgs_num;

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -48,10 +48,10 @@ struct dw_pci_controller {
 	u32 bus_num;
 	u32 tx_fifo_depth;
 	u32 rx_fifo_depth;
-	u32 clk_khz;
 	u32 flags;
 	struct dw_scl_sda_cfg *scl_sda_cfg;
 	int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
+	u32 (*get_clk_rate_khz)(struct dw_i2c_dev *dev);
 };
 
 /* Merrifield HCNT/LCNT/SDA hold time */
@@ -80,6 +80,11 @@ static struct dw_scl_sda_cfg hsw_config = {
 	.sda_hold = 0x9,
 };
 
+static u32 mfld_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+	return 25000;
+}
+
 static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);
@@ -120,13 +125,18 @@ static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 	return -ENODEV;
 }
 
+static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+	return 100000;
+}
+
 static struct dw_pci_controller dw_pci_controllers[] = {
 	[medfield] = {
 		.bus_num = -1,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
-		.clk_khz      = 25000,
 		.setup = mfld_setup,
+		.get_clk_rate_khz = mfld_get_clk_rate_khz,
 	},
 	[merrifield] = {
 		.bus_num = -1,
@@ -158,7 +168,7 @@ static struct dw_pci_controller dw_pci_controllers[] = {
 		.bus_num = -1,
 		.tx_fifo_depth = 32,
 		.rx_fifo_depth = 32,
-		.clk_khz = 100000,
+		.get_clk_rate_khz = ehl_get_clk_rate_khz,
 	},
 };
 
@@ -188,11 +198,6 @@ static int i2c_dw_pci_resume(struct device *dev)
 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
 			    i2c_dw_pci_resume, NULL);
 
-static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
-{
-	return dev->controller->clk_khz;
-}
-
 static int i2c_dw_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *id)
 {
@@ -233,8 +238,7 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 	if (r < 0)
 		return r;
 
-	dev->controller = controller;
-	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+	dev->get_clk_rate_khz = controller->get_clk_rate_khz;
 	dev->timings.bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
 	dev->base = pcim_iomap_table(pdev)[0];
 	dev->dev = &pdev->dev;