| Message ID | 20240302095430.4871-2-wahrenst@gmx.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pinctrl: bcm2835: Implement pin_conf_get | expand |
Sat, Mar 02, 2024 at 10:54:29AM +0100, Stefan Wahren kirjoitti: > Even the driver already has implemented pin_dbg_show, it could > be helpful to implement pin_conf_get for a more generic behavior. > Contrary to the BCM2711, the BCM2835 SOC doesn't allow to read > the bias config, so the implementation is limited to the basics. > + switch (param) { > + case PIN_CONFIG_INPUT_ENABLE: > + if (fsel != BCM2835_FSEL_GPIO_IN) > + return -EINVAL; > + > + *config = pinconf_to_config_packed(param, 1); > + return 0; Either use break here (and in similar situations)... > + case PIN_CONFIG_OUTPUT_ENABLE: > + if (fsel != BCM2835_FSEL_GPIO_OUT) > + return -EINVAL; > + > + *config = pinconf_to_config_packed(param, 1); > + return 0; > + > + case PIN_CONFIG_OUTPUT: > + if (fsel != BCM2835_FSEL_GPIO_OUT) > + return -EINVAL; > + > + val = bcm2835_gpio_get_bit(pc, GPLEV0, pin); > + *config = pinconf_to_config_packed(param, val); > + return 0; > + > + default: > + break; ...and return from here directly. > + } > + > return -ENOTSUPP; I.o.w. it's better to have a single point of returning a success code. > }
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c index 1489191a213f..b37c86ec6915 100644 --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c @@ -1003,7 +1003,40 @@ static const struct pinmux_ops bcm2835_pmx_ops = { static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin, unsigned long *config) { - /* No way to read back config in HW */ + enum pin_config_param param = pinconf_to_config_param(*config); + struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); + enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, pin); + u32 val; + + /* No way to read back bias config in HW */ + + switch (param) { + case PIN_CONFIG_INPUT_ENABLE: + if (fsel != BCM2835_FSEL_GPIO_IN) + return -EINVAL; + + *config = pinconf_to_config_packed(param, 1); + return 0; + + case PIN_CONFIG_OUTPUT_ENABLE: + if (fsel != BCM2835_FSEL_GPIO_OUT) + return -EINVAL; + + *config = pinconf_to_config_packed(param, 1); + return 0; + + case PIN_CONFIG_OUTPUT: + if (fsel != BCM2835_FSEL_GPIO_OUT) + return -EINVAL; + + val = bcm2835_gpio_get_bit(pc, GPLEV0, pin); + *config = pinconf_to_config_packed(param, val); + return 0; + + default: + break; + } + return -ENOTSUPP; }
Even the driver already has implemented pin_dbg_show, it could be helpful to implement pin_conf_get for a more generic behavior. Contrary to the BCM2711, the BCM2835 SOC doesn't allow to read the bias config, so the implementation is limited to the basics. Signed-off-by: Stefan Wahren <wahrenst@gmx.net> --- drivers/pinctrl/bcm/pinctrl-bcm2835.c | 35 ++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) -- 2.34.1