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Commit a4ba5e1b authored by Simon Guinot's avatar Simon Guinot Committed by Linus Walleij
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gpio: mvebu: add dbg_show function 



This patch adds a dedicated dbg_show function to the gpio-mvebu driver.
In addition to the generic gpiolib informations, this function displays
informations related with the specific Marvell registers (blink enable,
data in polarity, interrupt masks and cause).

Signed-off-by: default avatarSimon Guinot <simon.guinot@sequanux.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 047b93a3

drivers/gpio/gpio-mvebu.c

+59 −0
Original line number Diff line number Diff line
@@ -469,6 +469,64 @@ static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) 
	}

}



#ifdef CONFIG_DEBUG_FS

#include <linux/seq_file.h>



static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)

{

	struct mvebu_gpio_chip *mvchip =

		container_of(chip, struct mvebu_gpio_chip, chip);

	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;

	int i;



	out	= readl_relaxed(mvebu_gpioreg_out(mvchip));

	io_conf	= readl_relaxed(mvebu_gpioreg_io_conf(mvchip));

	blink	= readl_relaxed(mvebu_gpioreg_blink(mvchip));

	in_pol	= readl_relaxed(mvebu_gpioreg_in_pol(mvchip));

	data_in	= readl_relaxed(mvebu_gpioreg_data_in(mvchip));

	cause	= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));

	edg_msk	= readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));

	lvl_msk	= readl_relaxed(mvebu_gpioreg_level_mask(mvchip));



	for (i = 0; i < chip->ngpio; i++) {

		const char *label;

		u32 msk;

		bool is_out;



		label = gpiochip_is_requested(chip, i);

		if (!label)

			continue;



		msk = 1 << i;

		is_out = !(io_conf & msk);



		seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);



		if (is_out) {

			seq_printf(s, " out %s %s\n",

				   out & msk ? "hi" : "lo",

				   blink & msk ? "(blink )" : "");

			continue;

		}



		seq_printf(s, " in  %s (act %s) - IRQ",

			   (data_in ^ in_pol) & msk  ? "hi" : "lo",

			   in_pol & msk ? "lo" : "hi");

		if (!((edg_msk | lvl_msk) & msk)) {

			seq_printf(s, " disabled\n");

			continue;

		}

		if (edg_msk & msk)

			seq_printf(s, " edge ");

		if (lvl_msk & msk)

			seq_printf(s, " level");

		seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");

	}

}

#else

#define mvebu_gpio_dbg_show NULL

#endif



static struct of_device_id mvebu_gpio_of_match[] = {

	{

		.compatible = "marvell,orion-gpio",
@@ -543,6 +601,7 @@ static int mvebu_gpio_probe(struct platform_device *pdev) 
	mvchip->chip.ngpio = ngpios;

	mvchip->chip.can_sleep = 0;

	mvchip->chip.of_node = np;

	mvchip->chip.dbg_show = mvebu_gpio_dbg_show;



	spin_lock_init(&mvchip->lock);

	mvchip->membase = devm_ioremap_resource(&pdev->dev, res);