Hi Sascha, Am 13.11.23 um 08:04 schrieb Sascha Hauer:
Hi Stefan, On Sun, Nov 12, 2023 at 08:24:28PM +0100, Stefan Wahren wrote:gpiolib's gpiod_get_direction() function returns an erro if .get_direction callback is not defined. The patch implements the callback for IMX platform which is useful for debugging and also the kernel docs about struct gpio_chip recommends it. Inspired by drivers/gpio/gpio-mxs.c Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx> --- drivers/gpio/gpio-mxc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c index 4cb455b2bdee..ad8a4c73d47b 100644 --- a/drivers/gpio/gpio-mxc.c +++ b/drivers/gpio/gpio-mxc.c @@ -418,6 +418,18 @@ static void mxc_update_irq_chained_handler(struct mxc_gpio_port *port, bool enab } } +static int mxc_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct mxc_gpio_port *port = gpiochip_get_data(gc); + u32 dir; + + dir = readl(port->base + GPIO_GDIR); + if (dir & BIT(offset)) + return GPIO_LINE_DIRECTION_OUT; + + return GPIO_LINE_DIRECTION_IN; +} + static int mxc_gpio_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -490,6 +502,7 @@ static int mxc_gpio_probe(struct platform_device *pdev) port->gc.request = mxc_gpio_request; port->gc.free = mxc_gpio_free; port->gc.to_irq = mxc_gpio_to_irq; + port->gc.get_direction = mxc_gpio_get_direction;The driver passes port->base + GPIO_GDIR as *dirout argument to bgpio_init(). This should result in the .get_direction hook already being set to bgpio_get_dir() in the bgpio code. Doesn't this work as expected?
oh dear, i missed that. What a shame. Sorry, for the noise and thanks for pointing out. Regards Stefan
Sascha
