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Add seesaw gpio
Signed-off-by: Titouan Christophe <[email protected]>
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‎drivers/gpio/CMakeLists.txt‎

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@@ -95,6 +95,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_SAM gpio_sam.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SAM0 gpio_sam0.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SAM4L gpio_sam4l.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SEDI gpio_sedi.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SEESAW gpio_seesaw.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SI32 gpio_si32.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SIFIVE gpio_sifive.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SILABS_SIWX91X gpio_silabs_siwx91x.c)

‎drivers/gpio/Kconfig‎

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@@ -180,6 +180,7 @@ source "drivers/gpio/Kconfig.sam"
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source "drivers/gpio/Kconfig.sam0"
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source "drivers/gpio/Kconfig.sc18im704"
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source "drivers/gpio/Kconfig.sedi"
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source "drivers/gpio/Kconfig.seesaw"
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source "drivers/gpio/Kconfig.si32"
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source "drivers/gpio/Kconfig.sifive"
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source "drivers/gpio/Kconfig.siwx91x"

‎drivers/gpio/Kconfig.seesaw‎

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# Copyright 2025 Titouan Chrisotphe
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# SPDX-License-Identifier: Apache-2.0
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config GPIO_SEESAW
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bool "Adafruit Seesaw GPIO over I2C"
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default y
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depends on MFD_SEESAW
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depends on DT_HAS_ADAFRUIT_SEESAW_GPIO_ENABLED
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help
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Enable support for Adafruit Seesaw gpio

‎drivers/gpio/gpio_seesaw.c‎

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/*
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* Copyright (c) 2025 Titouan Christophe
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT adafruit_seesaw_gpio
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/mfd/mfd_seesaw.h>
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enum seesaw_mod_gpio {
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GPIO_DIRSET = 0x02,
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GPIO_DIRCLR = 0x03,
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GPIO_GPIO = 0x04,
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GPIO_SET = 0x05,
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GPIO_CLR = 0x06,
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GPIO_TOGGLE = 0x07,
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GPIO_INTENSET = 0x08,
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GPIO_INTENCLR = 0x09,
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GPIO_INTFLAG = 0x0a,
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GPIO_PULLENSET = 0x0b,
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GPIO_PULLENCLR = 0x0c,
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};
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struct seesaw_gpio_config {
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const struct device *seesaw;
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};
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static int seesaw_gpio_configure(const struct device *dev,
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gpio_pin_t pin, gpio_flags_t flags)
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{
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const struct seesaw_gpio_config *const config = dev->config;
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if (flags & GPIO_OUTPUT) {
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_DIRSET, BIT(pin));
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} else if (flags & GPIO_INPUT) {
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_DIRCLR, BIT(pin));
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} else {
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return -ENOTSUP;
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}
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if (flags & GPIO_PULL_UP) {
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_SET, BIT(pin));
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_PULLENSET, BIT(pin));
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} else if (flags & GPIO_PULL_DOWN) {
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_CLR, BIT(pin));
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_PULLENSET, BIT(pin));
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}
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return 0;
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}
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static int seesaw_gpio_port_get_raw(const struct device *dev, uint32_t *value)
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{
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uint32_t tmp;
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const struct seesaw_gpio_config *const config = dev->config;
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int ret = seesaw_read(config->seesaw, SEESAW_MOD_GPIO, GPIO_GPIO, (uint8_t *) &tmp, 4);
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if (ret == 0) {
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*value = sys_be32_to_cpu(ret);
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}
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return ret;
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}
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static int seesaw_gpio_port_set_masked_raw(const struct device *dev, uint32_t mask, uint32_t value)
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{
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const struct seesaw_gpio_config *const config = dev->config;
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_SET, value & mask);
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_CLR, ~value & mask);
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return 0;
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}
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static int seesaw_gpio_port_set_bits_raw(const struct device *dev, uint32_t mask)
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{
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const struct seesaw_gpio_config *const config = dev->config;
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_SET, mask);
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return 0;
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}
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static int seesaw_gpio_port_clear_bits_raw(const struct device *dev, uint32_t mask)
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{
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const struct seesaw_gpio_config *const config = dev->config;
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_CLR, mask);
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return 0;
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}
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static int seesaw_gpio_port_toggle_bits(const struct device *dev, uint32_t mask)
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{
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const struct seesaw_gpio_config *const config = dev->config;
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seesaw_write_uint32(config->seesaw, SEESAW_MOD_GPIO, GPIO_TOGGLE, mask);
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return 0;
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}
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static DEVICE_API(gpio, seesaw_gpio_api) = {
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.pin_configure = seesaw_gpio_configure,
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.port_get_raw = seesaw_gpio_port_get_raw,
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.port_set_masked_raw = seesaw_gpio_port_set_masked_raw,
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.port_set_bits_raw = seesaw_gpio_port_set_bits_raw,
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.port_clear_bits_raw = seesaw_gpio_port_clear_bits_raw,
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.port_toggle_bits = seesaw_gpio_port_toggle_bits,
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};
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static int seesaw_gpio_init(const struct device *dev)
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{
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const struct seesaw_gpio_config *config = dev->config;
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return seesaw_claim_module(config->seesaw, SEESAW_MOD_GPIO, dev);
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}
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#define SEESAW_GPIO_INIT(inst) \
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static const struct seesaw_gpio_config config_##inst = { \
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.seesaw = DEVICE_DT_GET(DT_INST_PARENT(inst)), \
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}; \
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DEVICE_DT_INST_DEFINE(inst, seesaw_gpio_init, NULL, NULL, &config_##inst, POST_KERNEL, \
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CONFIG_MFD_INIT_PRIORITY, &seesaw_gpio_api);
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DT_INST_FOREACH_STATUS_OKAY(SEESAW_GPIO_INIT)

‎dts/bindings/gpio/adafruit,seesaw-gpio.yaml‎

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# Copyright (c) 2025 Titouan Christophe
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# SPDX-License-Identifier: Apache-2.0
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description: Adafruit Seesaw gpio
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compatible: "adafruit,seesaw-gpio"
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include: [gpio-controller.yaml]
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properties:
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"#gpio-cells":
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const: 2
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gpio-cells:
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- pin
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- flags

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