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i2c: xlp9xx: add ACPI support for Broadcom Vulcan

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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>
This commit is contained in:
Tanmay Jagdale 2016-06-20 14:56:18 +05:30 committed by Wolfram Sang
parent 914017836a
commit 748c0bbbf1
1 changed files with 11 additions and 2 deletions
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13
drivers/i2c/busses/i2c-xlp9xx.c
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@ -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),
},
};