i2c: xlp9xx: add ACPI support for Broadcom Vulcan

Added ACPI support for the I2C controller present on Broadcom's
Vulcan ARM64 processor. ACPI ID used by the controller is BRCM9007.

Changed the xlp9xx_i2c_get_frequency() function to use
device_property_read_u32() API so that the "clock-frequency" value
can be read from _DSD in ACPI mode.

Signed-off-by: Tanmay Jagdale <tanmay.jagdale@broadcom.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index c941418..55a7bef 100644 (file)
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -6,6 +6,7 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <linux/acpi.h>
 #include <linux/completion.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
@@ -341,11 +342,10 @@ static struct i2c_algorithm xlp9xx_i2c_algo = {
 static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
                                    struct xlp9xx_i2c_dev *priv)
 {
-       struct device_node *np = pdev->dev.of_node;
        u32 freq;
        int err;
 
-       err = of_property_read_u32(np, "clock-frequency", &freq);
+       err = device_property_read_u32(&pdev->dev, "clock-frequency", &freq);
        if (err) {
                freq = XLP9XX_I2C_DEFAULT_FREQ;
                dev_dbg(&pdev->dev, "using default frequency %u\n", freq);
@@ -429,12 +429,21 @@ static const struct of_device_id xlp9xx_i2c_of_match[] = {
        { /* sentinel */ },
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
+       {"BRCM9007", 0},
+       {}
+};
+MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
+#endif
+
 static struct platform_driver xlp9xx_i2c_driver = {
        .probe = xlp9xx_i2c_probe,
        .remove = xlp9xx_i2c_remove,
        .driver = {
                .name = "xlp9xx-i2c",
                .of_match_table = xlp9xx_i2c_of_match,
+               .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids),
        },
 };