From 15efe0f3a57fc783526769fdd245bc2ebdbe2588 Mon Sep 17 00:00:00 2001 From: T Karthik Reddy Date: Wed, 23 Feb 2022 16:21:30 +0100 Subject: [PATCH] gpio: slg7xl45106: Add support for slg7xl45106 i2c gpo expander slg7xl45106 is i2c based 8-bit gpo expander, gpo pins are set and get by writing and reading corresponding gpo bit value into its data register. Signed-off-by: T Karthik Reddy Signed-off-by: Michal Simek Reviewed-by: Heiko Schocher Reviewed-by: Simon Glass Link: https://lore.kernel.org/r/839f475cc75c97ffb3496a4caa93de2faabdbca2.1645629688.git.michal.simek@xilinx.com --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 8 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio_slg7xl45106.c | 115 ++++++++++++++++++++++++++++++++ 4 files changed, 125 insertions(+) create mode 100644 drivers/gpio/gpio_slg7xl45106.c diff --git a/MAINTAINERS b/MAINTAINERS index 0f39bc6bc9..bb6ea06933 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -636,6 +636,7 @@ F: arch/arm/mach-zynqmp/ F: drivers/clk/clk_zynqmp.c F: driver/firmware/firmware-zynqmp.c F: drivers/fpga/zynqpl.c +F: drivers/gpio/gpio_slg7xl45106.c F: drivers/gpio/zynq_gpio.c F: drivers/gpio/zynqmp_gpio_modepin.c F: drivers/i2c/i2c-cdns.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 522dfc195e..a9e9b30f6c 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -550,4 +550,12 @@ config SL28CPLD_GPIO help Support GPIO access on Kontron sl28cpld board management controllers. +config SLG7XL45106_I2C_GPO + bool "slg7xl45106 i2c gpo expander" + depends on DM_GPIO + help + Support for slg7xl45106 i2c gpo expander. It is an i2c based + 8-bit gpo expander, all gpo lines are controlled by writing + value into data register. + endif diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 33f7d41b7d..b2e78b0570 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -72,3 +72,4 @@ obj-$(CONFIG_NOMADIK_GPIO) += nmk_gpio.o obj-$(CONFIG_MAX7320_GPIO) += max7320_gpio.o obj-$(CONFIG_SL28CPLD_GPIO) += sl28cpld-gpio.o obj-$(CONFIG_ZYNQMP_GPIO_MODEPIN) += zynqmp_gpio_modepin.o +obj-$(CONFIG_SLG7XL45106_I2C_GPO) += gpio_slg7xl45106.o diff --git a/drivers/gpio/gpio_slg7xl45106.c b/drivers/gpio/gpio_slg7xl45106.c new file mode 100644 index 0000000000..2cbf7488ad --- /dev/null +++ b/drivers/gpio/gpio_slg7xl45106.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * slg7xl45106_i2c_gpo driver + * + * Copyright (C) 2021 Xilinx, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define SLG7XL45106_REG 0xdb + +static int slg7xl45106_i2c_gpo_direction_input(struct udevice *dev, + unsigned int offset) +{ + return 0; +} + +static int slg7xl45106_i2c_gpo_xlate(struct udevice *dev, + struct gpio_desc *desc, + struct ofnode_phandle_args *args) +{ + desc->offset = (unsigned int)args->args[0]; + + return 0; +} + +static int slg7xl45106_i2c_gpo_set_value(struct udevice *dev, + unsigned int offset, int value) +{ + int ret; + u8 val; + + ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1); + if (ret) + return ret; + + if (value) + val |= BIT(offset); + else + val &= ~BIT(offset); + + return dm_i2c_write(dev, SLG7XL45106_REG, &val, 1); +} + +static int slg7xl45106_i2c_gpo_direction_output(struct udevice *dev, + unsigned int offset, int value) +{ + return slg7xl45106_i2c_gpo_set_value(dev, offset, value); +} + +static int slg7xl45106_i2c_gpo_get_value(struct udevice *dev, + unsigned int offset) +{ + int ret; + u8 val; + + ret = dm_i2c_read(dev, SLG7XL45106_REG, &val, 1); + if (ret) + return ret; + + return !!(val & BIT(offset)); +} + +static int slg7xl45106_i2c_gpo_get_function(struct udevice *dev, + unsigned int offset) +{ + return GPIOF_OUTPUT; +} + +static const struct dm_gpio_ops slg7xl45106_i2c_gpo_ops = { + .direction_input = slg7xl45106_i2c_gpo_direction_input, + .direction_output = slg7xl45106_i2c_gpo_direction_output, + .get_value = slg7xl45106_i2c_gpo_get_value, + .set_value = slg7xl45106_i2c_gpo_set_value, + .get_function = slg7xl45106_i2c_gpo_get_function, + .xlate = slg7xl45106_i2c_gpo_xlate, +}; + +static int slg7xl45106_i2c_gpo_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + const void *label_ptr; + + label_ptr = dev_read_prop(dev, "label", NULL); + if (label_ptr) { + uc_priv->bank_name = strdup(label_ptr); + if (!uc_priv->bank_name) + return -ENOMEM; + } else { + uc_priv->bank_name = dev->name; + } + + uc_priv->gpio_count = 8; + + return 0; +} + +static const struct udevice_id slg7xl45106_i2c_gpo_ids[] = { + { .compatible = "dlg,slg7xl45106",}, + { } +}; + +U_BOOT_DRIVER(slg7xl45106_i2c_gpo) = { + .name = "slg7xl45106_i2c_gpo", + .id = UCLASS_GPIO, + .ops = &slg7xl45106_i2c_gpo_ops, + .of_match = slg7xl45106_i2c_gpo_ids, + .probe = slg7xl45106_i2c_gpo_probe, +}; -- 2.39.5