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Message-ID: <CAMRc=Mf2ycyKbL35bdy5m1WBEap7Bu8OO2Q9AdZYgc04Uynf8g@mail.gmail.com>
Date: Thu, 18 Sep 2025 05:46:44 -0500
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>
Cc: mukesh.savaliya@....qualcomm.com, anup.kulkarni@....qualcomm.com,
Gregor Herburger <gregor.herburger@...tq-group.com>, mkl@...gutronix.de, mani@...nel.org,
thomas.kopp@...rochip.com, mailhol.vincent@...adoo.fr, robh@...nel.org,
krzk+dt@...nel.org, conor+dt@...nel.org, linus.walleij@...aro.org,
brgl@...ev.pl, linux-can@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/6] can: mcp251xfd: add gpio functionality
On Thu, 18 Sep 2025 08:49:02 +0200, Viken Dadhaniya
<viken.dadhaniya@....qualcomm.com> said:
> From: Gregor Herburger <gregor.herburger@...tq-group.com>
>
> The mcp251xfd devices allow two pins to be configured as gpio. Add this
> functionality to driver.
>
> Signed-off-by: Gregor Herburger <gregor.herburger@...tq-group.com>
> Tested-by: Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>
> Signed-off-by: Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>
> ---
> .../net/can/spi/mcp251xfd/mcp251xfd-core.c | 179 ++++++++++++++++++
> drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 4 +
> 2 files changed, 183 insertions(+)
>
> diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> index ea41f04ae1a6..8c253091f498 100644
> --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> @@ -16,6 +16,7 @@
> #include <linux/bitfield.h>
> #include <linux/clk.h>
> #include <linux/device.h>
> +#include <linux/gpio/driver.h>
> #include <linux/mod_devicetable.h>
> #include <linux/module.h>
> #include <linux/pm_runtime.h>
> @@ -1797,6 +1798,178 @@ static int mcp251xfd_register_check_rx_int(struct mcp251xfd_priv *priv)
> return 0;
> }
>
> +#ifdef CONFIG_GPIOLIB
Any reason why you don't just depend on GPIOLIB in Kconfig? There's no
reason to make it optional if the device always has the GPIO pins.
> +static const char * const mcp251xfd_gpio_names[] = { "GPIO0", "GPIO1" };
> +
> +static int mcp251xfd_gpio_request(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 pin_mask = MCP251XFD_REG_IOCON_PM(offset);
> + int ret;
> +
> + if (priv->rx_int && offset == 1) {
> + netdev_err(priv->ndev, "Can't use GPIO 1 with RX-INT!\n");
> + return -EINVAL;
> + }
> +
> + ret = pm_runtime_resume_and_get(priv->ndev->dev.parent);
> + if (ret)
> + return ret;
> +
> + return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON,
> + pin_mask, pin_mask);
> +}
> +
> +static void mcp251xfd_gpio_free(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> +
> + pm_runtime_put(priv->ndev->dev.parent);
> +}
> +
> +static int mcp251xfd_gpio_get_direction(struct gpio_chip *chip,
> + unsigned int offset)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 mask = MCP251XFD_REG_IOCON_TRIS(offset);
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(priv->map_reg, MCP251XFD_REG_IOCON, &val);
> + if (ret)
> + return ret;
> +
> + if (mask & val)
> + return GPIO_LINE_DIRECTION_IN;
> +
> + return GPIO_LINE_DIRECTION_OUT;
> +}
> +
> +static int mcp251xfd_gpio_get(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 mask = MCP251XFD_REG_IOCON_GPIO(offset);
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(priv->map_reg, MCP251XFD_REG_IOCON, &val);
> + if (ret)
> + return ret;
> +
> + return !!(mask & val);
> +}
> +
> +static int mcp251xfd_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
> + unsigned long *bit)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(priv->map_reg, MCP251XFD_REG_IOCON, &val);
> + if (ret)
> + return ret;
> +
> + *bit = FIELD_GET(MCP251XFD_REG_IOCON_GPIO_MASK, val) & *mask;
> +
> + return 0;
> +}
> +
> +static int mcp251xfd_gpio_direction_output(struct gpio_chip *chip,
> + unsigned int offset, int value)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 dir_mask = MCP251XFD_REG_IOCON_TRIS(offset);
> + u32 val_mask = MCP251XFD_REG_IOCON_LAT(offset);
> + u32 val;
> +
> + if (value)
> + val = val_mask;
> + else
> + val = 0;
> +
> + return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON,
> + dir_mask | val_mask, val);
> +}
> +
> +static int mcp251xfd_gpio_direction_input(struct gpio_chip *chip,
> + unsigned int offset)
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 dir_mask = MCP251XFD_REG_IOCON_TRIS(offset);
> +
> + return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON,
> + dir_mask, dir_mask);
> +}
> +
> +static void mcp251xfd_gpio_set(struct gpio_chip *chip, unsigned int offset,
> + int value)
You must be rebased on pre v6.17 code, this will not compile with current
mainline.
> +{
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 val_mask = MCP251XFD_REG_IOCON_LAT(offset);
> + u32 val;
> + int ret;
> +
> + if (value)
> + val = val_mask;
> + else
> + val = 0;
> +
> + ret = regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON,
> + val_mask, val);
> + if (ret)
> + dev_err(&priv->spi->dev, "Failed to set GPIO %u: %d\n",
> + offset, ret);
> +}
> +
> +static void mcp251xfd_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
> + unsigned long *bits)
> +{
Same here, the setter callbacks now return int.
> + struct mcp251xfd_priv *priv = gpiochip_get_data(chip);
> + u32 val;
> + int ret;
> +
> + val = FIELD_PREP(MCP251XFD_REG_IOCON_LAT_MASK, *bits);
> +
> + ret = regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON,
> + MCP251XFD_REG_IOCON_LAT_MASK, val);
> + if (ret)
> + dev_err(&priv->spi->dev, "Failed to set GPIOs %d\n", ret);
> +}
> +
> +static int mcp251fdx_gpio_setup(struct mcp251xfd_priv *priv)
> +{
> + struct gpio_chip *gc = &priv->gc;
> +
> + if (!device_property_present(&priv->spi->dev, "gpio-controller"))
> + return 0;
> +
> + gc->label = dev_name(&priv->spi->dev);
> + gc->parent = &priv->spi->dev;
> + gc->owner = THIS_MODULE;
> + gc->request = mcp251xfd_gpio_request;
> + gc->free = mcp251xfd_gpio_free;
> + gc->get_direction = mcp251xfd_gpio_get_direction;
> + gc->direction_output = mcp251xfd_gpio_direction_output;
> + gc->direction_input = mcp251xfd_gpio_direction_input;
> + gc->get = mcp251xfd_gpio_get;
> + gc->get_multiple = mcp251xfd_gpio_get_multiple;
> + gc->set = mcp251xfd_gpio_set;
> + gc->set_multiple = mcp251xfd_gpio_set_multiple;
> + gc->base = -1;
> + gc->can_sleep = true;
> + gc->ngpio = ARRAY_SIZE(mcp251xfd_gpio_names);
> + gc->names = mcp251xfd_gpio_names;
> +
> + return devm_gpiochip_add_data(&priv->spi->dev, gc, priv);
> +}
> +#else
> +static inline int mcp251fdx_gpio_setup(struct mcp251xfd_priv *priv)
> +{
> + return 0;
> +}
> +#endif
> +
> static int
> mcp251xfd_register_get_dev_id(const struct mcp251xfd_priv *priv, u32 *dev_id,
> u32 *effective_speed_hz_slow,
> @@ -1930,6 +2103,12 @@ static int mcp251xfd_register(struct mcp251xfd_priv *priv)
>
> mcp251xfd_ethtool_init(priv);
>
> + err = mcp251fdx_gpio_setup(priv);
> + if (err) {
> + dev_err_probe(&priv->spi->dev, err, "Failed to register gpio-controller.\n");
> + goto out_runtime_disable;
> + }
> +
> err = register_candev(ndev);
> if (err)
> goto out_runtime_disable;
> diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
> index bd28510a6583..fd9e005708e4 100644
> --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
> +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
> @@ -15,6 +15,7 @@
> #include <linux/can/dev.h>
> #include <linux/can/rx-offload.h>
> #include <linux/gpio/consumer.h>
> +#include <linux/gpio/driver.h>
> #include <linux/kernel.h>
> #include <linux/netdevice.h>
> #include <linux/regmap.h>
> @@ -676,6 +677,9 @@ struct mcp251xfd_priv {
>
> struct mcp251xfd_devtype_data devtype_data;
> struct can_berr_counter bec;
> +#ifdef CONFIG_GPIOLIB
> + struct gpio_chip gc;
> +#endif
> };
>
> #define MCP251XFD_IS(_model) \
> --
> 2.34.1
>
>
Bart
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