v4.19.13 snapshot.
diff --git a/drivers/i2c/busses/i2c-pxa-pci.c b/drivers/i2c/busses/i2c-pxa-pci.c
new file mode 100644
index 0000000..72ea8f4
--- /dev/null
+++ b/drivers/i2c/busses/i2c-pxa-pci.c
@@ -0,0 +1,154 @@
+/*
+ * CE4100 PCI-I2C glue code for PXA's driver
+ * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ * License: GPL v2
+ *
+ * The CE4100's I2C device is more or less the same one as found on PXA.
+ * It does not support slave mode, the register slightly moved. This PCI
+ * device provides three bars, every contains a single I2C controller.
+ */
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/i2c-pxa.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+
+#define CE4100_PCI_I2C_DEVS 3
+
+struct ce4100_devices {
+ struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
+};
+
+static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
+{
+ struct platform_device *pdev;
+ struct i2c_pxa_platform_data pdata;
+ struct resource res[2];
+ struct device_node *child;
+ static int devnum;
+ int ret;
+
+ memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
+ memset(&res, 0, sizeof(res));
+
+ res[0].flags = IORESOURCE_MEM;
+ res[0].start = pci_resource_start(dev, bar);
+ res[0].end = pci_resource_end(dev, bar);
+
+ res[1].flags = IORESOURCE_IRQ;
+ res[1].start = dev->irq;
+ res[1].end = dev->irq;
+
+ for_each_child_of_node(dev->dev.of_node, child) {
+ const void *prop;
+ struct resource r;
+ int ret;
+
+ ret = of_address_to_resource(child, 0, &r);
+ if (ret < 0)
+ continue;
+ if (r.start != res[0].start)
+ continue;
+ if (r.end != res[0].end)
+ continue;
+ if (r.flags != res[0].flags)
+ continue;
+
+ prop = of_get_property(child, "fast-mode", NULL);
+ if (prop)
+ pdata.fast_mode = 1;
+
+ break;
+ }
+
+ if (!child) {
+ dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
+ bar);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ pdev = platform_device_alloc("ce4100-i2c", devnum);
+ if (!pdev) {
+ of_node_put(child);
+ ret = -ENOMEM;
+ goto out;
+ }
+ pdev->dev.parent = &dev->dev;
+ pdev->dev.of_node = child;
+
+ ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
+ if (ret)
+ goto err;
+
+ ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
+ if (ret)
+ goto err;
+
+ ret = platform_device_add(pdev);
+ if (ret)
+ goto err;
+ devnum++;
+ return pdev;
+err:
+ platform_device_put(pdev);
+out:
+ return ERR_PTR(ret);
+}
+
+static int ce4100_i2c_probe(struct pci_dev *dev,
+ const struct pci_device_id *ent)
+{
+ int ret;
+ int i;
+ struct ce4100_devices *sds;
+
+ ret = pci_enable_device_mem(dev);
+ if (ret)
+ return ret;
+
+ if (!dev->dev.of_node) {
+ dev_err(&dev->dev, "Missing device tree node.\n");
+ return -EINVAL;
+ }
+ sds = kzalloc(sizeof(*sds), GFP_KERNEL);
+ if (!sds) {
+ ret = -ENOMEM;
+ goto err_mem;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
+ sds->pdev[i] = add_i2c_device(dev, i);
+ if (IS_ERR(sds->pdev[i])) {
+ ret = PTR_ERR(sds->pdev[i]);
+ while (--i >= 0)
+ platform_device_unregister(sds->pdev[i]);
+ goto err_dev_add;
+ }
+ }
+ pci_set_drvdata(dev, sds);
+ return 0;
+
+err_dev_add:
+ kfree(sds);
+err_mem:
+ pci_disable_device(dev);
+ return ret;
+}
+
+static const struct pci_device_id ce4100_i2c_devices[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
+ { },
+};
+
+static struct pci_driver ce4100_i2c_driver = {
+ .driver = {
+ .suppress_bind_attrs = true,
+ },
+ .name = "ce4100_i2c",
+ .id_table = ce4100_i2c_devices,
+ .probe = ce4100_i2c_probe,
+};
+builtin_pci_driver(ce4100_i2c_driver);