On the SIMATIC, IOT2040 only a single pin is exportable as GPIO, the
rest is required to operate the UART. To allow modeling this case,
expand the platform device data structure to specify a (consecutive) pin
subset for exporting by the gpio-exar driver.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
drivers/gpio/gpio-exar.c | 28 +++++++++++++++++++---------
drivers/tty/serial/8250/8250_exar.c | 7 +++++--
include/linux/platform_data/gpio-exar.h | 3 +++
3 files changed, 27 insertions(+), 11 deletions(-)
diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
index d8b6296c11de..e0698a1ae012 100644
--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -32,6 +32,7 @@ struct exar_gpio_chip {
int index;
void __iomem *regs;
char name[20];
+ unsigned int first_gpio;
};
static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
@@ -52,9 +53,11 @@ static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
static int exar_set_direction(struct gpio_chip *chip, int direction,
unsigned int offset)
{
- unsigned int bank = offset / 8;
- unsigned int addr;
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ unsigned int bank, addr;
+ offset += exar_gpio->first_gpio;
+ bank = offset / 8;
addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
exar_update(chip, addr, direction, offset % 8);
return 0;
@@ -74,10 +77,12 @@ static int exar_get(struct gpio_chip *chip, unsigned int reg)
static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
{
- unsigned int bank = offset / 8;
- unsigned int addr;
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ unsigned int bank, addr;
int val;
+ offset += exar_gpio->first_gpio;
+ bank = offset / 8;
addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
val = exar_get(chip, addr) & BIT(offset % 8);
@@ -86,10 +91,12 @@ static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
{
- unsigned int bank = offset / 8;
- unsigned int addr;
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ unsigned int bank, addr;
int val;
+ offset += exar_gpio->first_gpio;
+ bank = offset / 8;
addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
val = exar_get(chip, addr) & BIT(offset % 8);
@@ -99,9 +106,11 @@ static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
int value)
{
- unsigned int bank = offset / 8;
- unsigned int addr;
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ unsigned int bank, addr;
+ offset += exar_gpio->first_gpio;
+ bank = offset / 8;
addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
exar_update(chip, addr, value, offset % 8);
}
@@ -154,9 +163,10 @@ static int gpio_exar_probe(struct platform_device *pdev)
exar_gpio->gpio_chip.get = exar_get_value;
exar_gpio->gpio_chip.set = exar_set_value;
exar_gpio->gpio_chip.base = -1;
- exar_gpio->gpio_chip.ngpio = 16;
+ exar_gpio->gpio_chip.ngpio = pdata->ngpio;
exar_gpio->regs = p;
exar_gpio->index = index;
+ exar_gpio->first_gpio = pdata->first_gpio;
ret = devm_gpiochip_add_data(&pdev->dev,
&exar_gpio->gpio_chip, exar_gpio);
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 0a806daaff8b..d9c52288d6c9 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -189,7 +189,8 @@ static void setup_gpio(u8 __iomem *p)
}
static void *
-xr17v35x_register_gpio(struct pci_dev *pcidev)
+xr17v35x_register_gpio(struct pci_dev *pcidev, unsigned int first_gpio,
+ unsigned int ngpio)
{
struct platform_device *pdev;
struct gpio_exar_pdata pdata;
@@ -199,6 +200,8 @@ xr17v35x_register_gpio(struct pci_dev *pcidev)
return NULL;
pdata.parent = pcidev;
+ pdata.first_gpio = first_gpio;
+ pdata.ngpio = ngpio;
if (platform_device_add_data(pdev, &pdata, sizeof(pdata)) < 0 ||
platform_device_add(pdev) < 0) {
@@ -242,7 +245,7 @@ pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
/* Setup Multipurpose Input/Output pins. */
setup_gpio(p);
- port->port.private_data = xr17v35x_register_gpio(pcidev);
+ port->port.private_data = xr17v35x_register_gpio(pcidev, 0, 16);
}
return 0;
diff --git a/include/linux/platform_data/gpio-exar.h b/include/linux/platform_data/gpio-exar.h
index 1a13e9ddaf7d..1754f5a2842d 100644
--- a/include/linux/platform_data/gpio-exar.h
+++ b/include/linux/platform_data/gpio-exar.h
@@ -17,6 +17,9 @@ struct pci_dev;
struct gpio_exar_pdata {
struct pci_dev *parent;
+
+ unsigned int first_gpio;
+ unsigned int ngpio;
};
#endif /* __GPIO_EXAR_PDATA_H */
--
2.12.0
--
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