gpio: mxs: implement get_direction callback
gpiolib's gpiod_get_direction() function returns the EINVAL error if .get_direction callback is not defined. The patch implements the callback for mxs chip which is useful for debugging. Inspired by arch/arm/mach-at91/gpio.c On the moment the patch is required to get the patch "serial: mxs-auart: enable PPS support" working. It is planned to introduce new mctrl_gpio helpers to avoid gpiod_get_direction() function. Signed-off-by: Janusz Uzycki <j.uzycki@elproma.com.pl> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -227,6 +227,18 @@ static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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return irq_find_mapping(port->domain, offset);
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}
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static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
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{
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struct bgpio_chip *bgc = to_bgpio_chip(gc);
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struct mxs_gpio_port *port =
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container_of(bgc, struct mxs_gpio_port, bgc);
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u32 mask = 1 << offset;
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u32 dir;
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dir = readl(port->base + PINCTRL_DOE(port));
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return !(dir & mask);
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}
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static struct platform_device_id mxs_gpio_ids[] = {
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{
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.name = "imx23-gpio",
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@ -320,6 +332,7 @@ static int mxs_gpio_probe(struct platform_device *pdev)
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goto out_irqdesc_free;
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port->bgc.gc.to_irq = mxs_gpio_to_irq;
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port->bgc.gc.get_direction = mxs_gpio_get_direction;
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port->bgc.gc.base = port->id * 32;
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err = gpiochip_add(&port->bgc.gc);
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