On Mon, Jun 7, 2021 at 2:06 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Mon, Jun 7, 2021 at 1:51 PM Robert Marko <robert.marko@xxxxxxxxxx> wrote:
> >
> > Delta TN48M CPLD is used as a GPIO expander for the SFP GPIOs.
> >
> > It is a mix of input only and output only pins.
> >
> > Signed-off-by: Robert Marko <robert.marko@xxxxxxxxxx>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> > Acked-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> > Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
>
> Couple of small issues below.
> Otherwise looks good!
>
> > ---
> > 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 | 89 +++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 102 insertions(+)
> > create mode 100644 drivers/gpio/gpio-tn48m.c
> >
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index e3607ec4c2e8..472f7764508e 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -1310,6 +1310,18 @@ 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 CPLD.
> > + They are used for inputs and outputs on the SFP slots.
> > +
> > + 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 c58a90a3c3b1..271fb806475e 100644
> > --- a/drivers/gpio/Makefile
> > +++ b/drivers/gpio/Makefile
> > @@ -145,6 +145,7 @@ 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..41484c002826
> > --- /dev/null
> > +++ b/drivers/gpio/gpio-tn48m.c
> > @@ -0,0 +1,89 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Delta TN48M CPLD GPIO driver
> > + *
> > + * Copyright 2021 Sartura Ltd
> > + *
> > + * Author: Robert Marko <robert.marko@xxxxxxxxxx>
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/gpio/driver.h>
> > +#include <linux/gpio/regmap.h>
>
> > +#include <linux/kernel.h>
>
> What is this header for?
Its not being actually used,
I will drop it.
>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +
> > +enum tn48m_gpio_type {
> > + TN48M_SFP_TX_DISABLE = 1,
> > + TN48M_SFP_PRESENT,
> > + TN48M_SFP_LOS,
> > +};
> > +
> > +static int tn48m_gpio_probe(struct platform_device *pdev)
> > +{
> > + struct gpio_regmap_config config = {0};
> > + enum tn48m_gpio_type type;
> > + struct regmap *regmap;
> > + u32 base;
> > + int ret;
> > +
> > + if (!pdev->dev.parent)
> > + return -ENODEV;
> > +
> > + type = (uintptr_t)device_get_match_data(&pdev->dev);
> > + if (!type)
> > + return -ENODEV;
> > +
> > + ret = device_property_read_u32(&pdev->dev, "reg", &base);
> > + if (ret)
>
> > + return -EINVAL;
>
> return ret;
Will fix this and send v6 in a couple of minutes.
Thanks,
Robert
>
> > + regmap = dev_get_regmap(pdev->dev.parent, NULL);
> > + if (!regmap)
> > + return -ENODEV;
> > +
> > + config.regmap = regmap;
> > + config.parent = &pdev->dev;
> > + config.ngpio = 4;
> > +
> > + switch (type) {
> > + case TN48M_SFP_TX_DISABLE:
> > + config.reg_set_base = base;
> > + break;
> > + case TN48M_SFP_PRESENT:
> > + config.reg_dat_base = base;
> > + break;
> > + case TN48M_SFP_LOS:
> > + config.reg_dat_base = base;
> > + break;
> > + default:
> > + dev_err(&pdev->dev, "unknown type %d\n", type);
> > + return -ENODEV;
> > + }
> > +
> > + 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-gpio-sfp-tx-disable", .data = (void *)TN48M_SFP_TX_DISABLE },
> > + { .compatible = "delta,tn48m-gpio-sfp-present", .data = (void *)TN48M_SFP_PRESENT },
> > + { .compatible = "delta,tn48m-gpio-sfp-los", .data = (void *)TN48M_SFP_LOS },
> > + { }
> > +};
> > +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@xxxxxxxxxx>");
> > +MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.31.1
> >
>
>
> --
> With Best Regards,
> Andy Shevchenko
--
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@xxxxxxxxxx
Web: www.sartura.hr
