On 06.05.2024 07:59:47, Gregor Herburger wrote:
> The mcp251xfd devices allow two pins to be configured as gpio. Add this
> functionality to driver.
>
> Signed-off-by: Gregor Herburger <gregor.herburger@xxxxxxxxxxxxxxx>
> ---
> drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 173 +++++++++++++++++++++++++
> drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 6 +
> 2 files changed, 179 insertions(+)
>
> diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> index 4739ad80ef2a..de301f3a2f4e 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>
> @@ -1768,6 +1769,172 @@ static int mcp251xfd_register_check_rx_int(struct mcp251xfd_priv *priv)
> return 0;
> }
>
> +#ifdef CONFIG_GPIOLIB
> +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_PM0 << 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);
The PM bits _should_ be 1 here, as it's the reset default.
But you have to convert mcp251xfd_chip_rx_int_enable() and
mcp251xfd_chip_rx_int_disable() to from regmap_write() to
regmap_update_bits(). Please do this in a separate patch before adding
the gpio support.
> +}
regards,
Marc
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