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@xxxxxxxxxxxx>
---
Changes in v3:
Sorted header file inclusion.
Rename vulcan_i2c_acpi_ids to xlp9xx_i2c_acpi_ids to stay
consistent with rest of the driver.
Changes in v2:
Changed of_property_read_u32() to device_property_read_u32()
so that the "clock-frequency" can be read from DTS or ACPI.
drivers/i2c/busses/i2c-xlp9xx.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index c941418..55a7bef 100644
--- 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),
},
};
--
2.1.0
--
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