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Date: Fri, 5 Nov 2021 14:05:38 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Robert Marko <robert.marko@...tura.hr>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Lee Jones <lee.jones@...aro.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Michael Walle <michael@...le.cc>,
Luka Perkov <luka.perkov@...tura.hr>
Subject: Re: [PATCH v8 2/6] gpio: Add Delta TN48M CPLD GPIO driver
On Fri, Nov 5, 2021 at 1:39 PM Robert Marko <robert.marko@...tura.hr> wrote:
>
> Delta TN48M switch has an onboard Lattice CPLD that is used as a GPIO
> expander.
>
> The CPLD provides 12 pins in total on the TN48M, but on more advanced
> switch models it provides up to 192 pins, so the driver is extendable
> to support more switches.
With or without nit-pick below
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> Changes in v8:
> * No need to assing NULL to gpio_config per Andys comment
>
> Changes in v7:
> * Change compatibles, reduce their number
> * Rework the driver to be easily extendible to support more devices
> * Use match data to populate configuration
> * Drop reviews and ACK-s as the driver changed
>
> Changes in v6:
> * Drop unused header
> * Return the return value of device_property_read_u32()
> instead of a hardcoded return
>
> Changes in v2:
> * Rewrite to use simple I2C MFD and GPIO regmap
> * Drop DT bindings for pin numbering
> ---
> drivers/gpio/Kconfig | 12 +++++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-tn48m.c | 100 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 113 insertions(+)
> create mode 100644 drivers/gpio/gpio-tn48m.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index fab571016adf..31b83271f954 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -1344,6 +1344,18 @@ config GPIO_TIMBERDALE
> help
> Add support for the GPIO IP in the timberdale FPGA.
>
> +config GPIO_TN48M_CPLD
> + tristate "Delta Networks TN48M switch CPLD GPIO driver"
> + depends on MFD_TN48M_CPLD
> + select GPIO_REGMAP
> + help
> + This enables support for the GPIOs found on the Delta
> + Networks TN48M switch Lattice CPLD. It provides 12 pins in total,
> + they are input-only or ouput-only type.
> +
> + This driver can also be built as a module. If so, the
> + module will be called gpio-tn48m.
> +
> config GPIO_TPS65086
> tristate "TI TPS65086 GPO"
> depends on MFD_TPS65086
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 32a32659866a..93abc7461e45 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -148,6 +148,7 @@ obj-$(CONFIG_GPIO_TEGRA186) += gpio-tegra186.o
> obj-$(CONFIG_GPIO_TEGRA) += gpio-tegra.o
> obj-$(CONFIG_GPIO_THUNDERX) += gpio-thunderx.o
> obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
> +obj-$(CONFIG_GPIO_TN48M_CPLD) += gpio-tn48m.o
> obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
> obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o
> obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
> diff --git a/drivers/gpio/gpio-tn48m.c b/drivers/gpio/gpio-tn48m.c
> new file mode 100644
> index 000000000000..485565813ad4
> --- /dev/null
> +++ b/drivers/gpio/gpio-tn48m.c
> @@ -0,0 +1,100 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Delta TN48M CPLD GPIO driver
> + *
> + * Copyright (C) 2021 Sartura Ltd.
> + *
> + * Author: Robert Marko <robert.marko@...tura.hr>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/gpio/regmap.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +enum tn48m_gpio_type {
> + TN48M_GP0 = 1,
> + TN48M_GPI,
> +};
> +
> +struct tn48m_gpio_config {
> + int ngpio;
> + int ngpio_per_reg;
> + enum tn48m_gpio_type type;
> +};
> +
> +static const struct tn48m_gpio_config tn48m_gpo_config = {
> + .ngpio = 4,
> + .ngpio_per_reg = 4,
> + .type = TN48M_GP0,
> +};
> +
> +static const struct tn48m_gpio_config tn48m_gpi_config = {
> + .ngpio = 4,
> + .ngpio_per_reg = 4,
> + .type = TN48M_GPI,
> +};
> +
> +static int tn48m_gpio_probe(struct platform_device *pdev)
> +{
> + const struct tn48m_gpio_config *gpio_config;
> + struct gpio_regmap_config config = {0};
I see, I mixed this up with regmap itself.
One nit-pick, though. The 0 there is not needed, the common use is {}.
> + struct regmap *regmap;
> + u32 base;
> + int ret;
> +
> + if (!pdev->dev.parent)
> + return -ENODEV;
> +
> + gpio_config = device_get_match_data(&pdev->dev);
> + if (!gpio_config)
> + return -ENODEV;
> +
> + ret = device_property_read_u32(&pdev->dev, "reg", &base);
> + if (ret)
> + return ret;
> +
> + regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!regmap)
> + return -ENODEV;
> +
> + config.regmap = regmap;
> + config.parent = &pdev->dev;
> + config.ngpio = gpio_config->ngpio;
> + config.ngpio_per_reg = gpio_config->ngpio_per_reg;
> + switch (gpio_config->type) {
> + case TN48M_GP0:
> + config.reg_set_base = base;
> + break;
> + case TN48M_GPI:
> + config.reg_dat_base = base;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
> +}
> +
> +static const struct of_device_id tn48m_gpio_of_match[] = {
> + { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },
> + { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
> +
> +static struct platform_driver tn48m_gpio_driver = {
> + .driver = {
> + .name = "delta-tn48m-gpio",
> + .of_match_table = tn48m_gpio_of_match,
> + },
> + .probe = tn48m_gpio_probe,
> +};
> +module_platform_driver(tn48m_gpio_driver);
> +
> +MODULE_AUTHOR("Robert Marko <robert.marko@...tura.hr>");
> +MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
> +MODULE_LICENSE("GPL");
> --
> 2.33.1
>
--
With Best Regards,
Andy Shevchenko
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