diff options
| author | Sander Vanheule <sander@svanheule.net> | 2021-11-20 20:11:34 +0100 |
|---|---|---|
| committer | Stijn Tintel <stijn@linux-ipv6.be> | 2022-02-17 19:11:42 +0200 |
| commit | a93dfff10e067c152d4872719ec7837fcd8c94a3 (patch) | |
| tree | d2796674d75a6c91906534995ff5d45f241b421b /target/linux/realtek/files-5.10/drivers/gpio | |
| parent | 44f7cfd760cc85355611a694a9b4cf04c5736845 (diff) | |
| download | upstream-a93dfff10e067c152d4872719ec7837fcd8c94a3.tar.gz upstream-a93dfff10e067c152d4872719ec7837fcd8c94a3.tar.bz2 upstream-a93dfff10e067c152d4872719ec7837fcd8c94a3.zip | |
realtek: add RTL8231 chip detection
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>
Diffstat (limited to 'target/linux/realtek/files-5.10/drivers/gpio')
| -rw-r--r-- | target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c b/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c index d7643083da..7a1d6aa136 100644 --- a/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c +++ b/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c @@ -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; |