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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2022-09-02 21:26:48 +0300
committerLinus Walleij <linus.walleij@linaro.org>2022-09-08 10:06:11 +0200
commit785b1bd8546eb0d9e70bd4d859583c33aaceeb9b (patch)
treed29dbf1495977d9482be2d9ef3f26e50e0e050fb /drivers/pinctrl
parent618a43ff1f37603164ac82cfa0734a39c079a3e9 (diff)
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pinctrl: cy8c95x0: Override IRQ for one of the expanders on Galileo Gen 1
ACPI table on Intel Galileo Gen 1 has wrong pin number for IRQ resource of the I²C GPIO expander. Since we know what that number is and luckily have GPIO bases fixed for SoC's controllers, we may use a simple DMI quirk to match the platform and retrieve GpioInt() pin on it for the expander in question. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Patrick Rudolph <patrick.rudolph@9elements.com> Link: https://lore.kernel.org/r/20220902182650.83098-15-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/pinctrl-cy8c95x0.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-cy8c95x0.c b/drivers/pinctrl/pinctrl-cy8c95x0.c
index 18a9f5a8ab2d..a42790950182 100644
--- a/drivers/pinctrl/pinctrl-cy8c95x0.c
+++ b/drivers/pinctrl/pinctrl-cy8c95x0.c
@@ -7,7 +7,9 @@
* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
*/
+#include <linux/acpi.h>
#include <linux/bitmap.h>
+#include <linux/dmi.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
@@ -73,6 +75,46 @@ static const struct of_device_id cy8c95x0_dt_ids[] = {
MODULE_DEVICE_TABLE(of, cy8c95x0_dt_ids);
+static const struct acpi_gpio_params cy8c95x0_irq_gpios = { 0, 0, true };
+
+static const struct acpi_gpio_mapping cy8c95x0_acpi_irq_gpios[] = {
+ { "irq-gpios", &cy8c95x0_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
+ { }
+};
+
+static int cy8c95x0_acpi_get_irq(struct device *dev)
+{
+ int ret;
+
+ ret = devm_acpi_dev_add_driver_gpios(dev, cy8c95x0_acpi_irq_gpios);
+ if (ret)
+ dev_warn(dev, "can't add GPIO ACPI mapping\n");
+
+ ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
+ if (ret < 0)
+ return ret;
+
+ dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
+ return ret;
+}
+
+static const struct dmi_system_id cy8c95x0_dmi_acpi_irq_info[] = {
+ {
+ /*
+ * On Intel Galileo Gen 1 board the IRQ pin is provided
+ * as an absolute number instead of being relative.
+ * Since first controller (gpio-sch.c) and second
+ * (gpio-dwapb.c) are at the fixed bases, we may safely
+ * refer to the number in the global space to get an IRQ
+ * out of it.
+ */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
+ },
+ },
+ {}
+};
+
#define MAX_BANK 8
#define BANK_SZ 8
#define MAX_LINE (MAX_BANK * BANK_SZ)
@@ -1309,6 +1351,12 @@ static int cy8c95x0_probe(struct i2c_client *client)
bitmap_set(chip->shiftmask, 0, 20);
mutex_init(&chip->i2c_lock);
+ if (dmi_first_match(cy8c95x0_dmi_acpi_irq_info)) {
+ ret = cy8c95x0_acpi_get_irq(&client->dev);
+ if (ret > 0)
+ client->irq = ret;
+ }
+
if (client->irq) {
ret = cy8c95x0_irq_setup(chip, client->irq);
if (ret)