linux-kernel - [PATCH 3/3] gpio: idio-16: Define fixed direction of the GPIO lines

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Message-Id: <20251017-fix-gpio-idio-16-regmap-v1-3-a7c71080f740@kernel.org>
Date: Fri, 17 Oct 2025 09:58:03 +0900
From: William Breathitt Gray <wbg@...nel.org>
To: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Linus Walleij <linus.walleij@...aro.org>
Cc: Michael Walle <mwalle@...nel.org>, 
 Ioana Ciornei <ioana.ciornei@....com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Mark Brown <broonie@...nel.org>, linux-gpio@...r.kernel.org, 
 linux-kernel@...r.kernel.org, William Breathitt Gray <wbg@...nel.org>, 
 Mark Cave-Ayland <mark.caveayland@...anix.com>, stable@...r.kernel.org
Subject: [PATCH 3/3] gpio: idio-16: Define fixed direction of the GPIO
 lines

The direction of the IDIO-16 GPIO lines is fixed with the first 16 lines
as output and the remaining 16 lines as input. Set the gpio_config
fixed_direction_output member to represent the fixed direction of the
GPIO lines.

Fixes: db02247827ef ("gpio: idio-16: Migrate to the regmap API")
Reported-by: Mark Cave-Ayland <mark.caveayland@...anix.com>
Link: https://lore.kernel.org/r/9b0375fd-235f-4ee1-a7fa-daca296ef6bf@nutanix.com
Suggested-by: Michael Walle <mwalle@...nel.org>
Cc: stable@...r.kernel.org # ae495810cffe: gpio: regmap: add the .fixed_direction_output configuration parameter
Cc: stable@...r.kernel.org
Signed-off-by: William Breathitt Gray <wbg@...nel.org>
---
 drivers/gpio/gpio-idio-16.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpio/gpio-idio-16.c b/drivers/gpio/gpio-idio-16.c
index 0103be977c66bb8d165c1c92123368be6832d120..4fbae6f6a49727df40f2793b42ca207d78ec272b 100644
--- a/drivers/gpio/gpio-idio-16.c
+++ b/drivers/gpio/gpio-idio-16.c
@@ -6,6 +6,7 @@
 
 #define DEFAULT_SYMBOL_NAMESPACE "GPIO_IDIO_16"
 
+#include <linux/bitmap.h>
 #include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -107,6 +108,7 @@ int devm_idio_16_regmap_register(struct device *const dev,
 	struct idio_16_data *data;
 	struct regmap_irq_chip *chip;
 	struct regmap_irq_chip_data *chip_data;
+	DECLARE_BITMAP(fixed_direction_output, IDIO_16_NGPIO);
 
 	if (!config->parent)
 		return -EINVAL;
@@ -164,6 +166,9 @@ int devm_idio_16_regmap_register(struct device *const dev,
 	gpio_config.irq_domain = regmap_irq_get_domain(chip_data);
 	gpio_config.reg_mask_xlate = idio_16_reg_mask_xlate;
 
+	bitmap_from_u64(fixed_direction_output, GENMASK_U64(15, 0));
+	gpio_config.fixed_direction_output = fixed_direction_output;
+
 	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
 }
 EXPORT_SYMBOL_GPL(devm_idio_16_regmap_register);

-- 
2.51.0