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realtek: add RTL8231 chip detection

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When initialising the driver, check if the RTL8231 chip is actually
present at the specified address. If the READY_CODE value does not match
the expected value, return -ENXIO to fail probing.

This should help users to figure out which address an RTL8231 is
configured to use, if measuring pull-up/-down resistors is not an
option.

On an unsuccesful probe, the driver will log:
    [    0.795364] Probing RTL8231 GPIOs
    [    0.798978] rtl8231_init called, MDIO bus ID: 30
    [    0.804194] rtl8231-gpio rtl8231-gpio: no device found at bus address 30

When a device is found, only the first two lines will be logged:
    [    0.453698] Probing RTL8231 GPIOs
    [    0.457312] rtl8231_init called, MDIO bus ID: 31

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Tested-by: Stijn Tintel <stijn@linux-ipv6.be>
This commit is contained in:
Sander Vanheule 2021-11-20 20:11:34 +01:00 committed by Stijn Tintel
parent 44f7cfd760
commit a93dfff10e
1 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c
View File

@ -8,6 +8,9 @@
/* RTL8231 registers for LED control */
#define RTL8231_LED_FUNC0 0x0000
#define RTL8231_LED_FUNC1 0x0001
#define RTL8231_READY_MASK 0x03f0
#define RTL8231_READY_VALUE 0x0370
#define RTL8231_GPIO_PIN_SEL(gpio) ((0x0002) + ((gpio) >> 4))
#define RTL8231_GPIO_DIR(gpio) ((0x0005) + ((gpio) >> 4))
#define RTL8231_GPIO_DATA(gpio) ((0x001C) + ((gpio) >> 4))
@ -238,6 +241,8 @@ void rtl8231_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
int rtl8231_init(struct rtl8231_gpios *gpios)
{
u32 ret;
pr_info("%s called, MDIO bus ID: %d\n", __func__, gpios->smi_bus_id);
gpios->reg_cached = 0;
@ -251,6 +256,10 @@ int rtl8231_init(struct rtl8231_gpios *gpios)
sw_w32_mask(3, 1, RTL838X_DMY_REG5);
}
ret = rtl8231_read(gpios, RTL8231_LED_FUNC1);
if ((ret & 0x80000000) || ((ret & RTL8231_READY_MASK) != RTL8231_READY_VALUE))
return -ENXIO;
/* Select GPIO functionality and force input direction for pins 0-36 */
rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(0), 0xffff);
rtl8231_write(gpios, RTL8231_GPIO_DIR(0), 0xffff);
@ -307,7 +316,11 @@ static int rtl8231_gpio_probe(struct platform_device *pdev)
return err;
}
rtl8231_init(gpios);
err = rtl8231_init(gpios);
if (err) {
dev_err(dev, "no device found at bus address %d\n", gpios->smi_bus_id);
return err;
}
gpios->dev = dev;
gpios->gc.base = -1;