On Mon, Dec 17, 2018 at 09:10:42AM +0100, Rouven Czerwinski wrote:
> Add the compatible for the Raspberry Pi AUX UART and an init function which
> enables it via the aux register and configures the correct shift value.
>
> Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
> ---
> drivers/serial/serial_ns16550.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
> index 8ddcfdb..256063a 100644
> --- a/drivers/serial/serial_ns16550.c
> +++ b/drivers/serial/serial_ns16550.c
> @@ -253,6 +253,20 @@ static void ns16550_jz_init_port(struct console_device *cdev)
> ns16550_serial_init_port(cdev);
> }
>
> +static void rpi_init_port(struct console_device *cdev)
> +{
> + struct ns16550_priv *priv = to_ns16550_priv(cdev);
> +
> + writeb(0x01, 0x3f215004);
Same here. I guess it is some register that has to do with the ns16550?
But what happens when we write 1 to it?
- Roland
> + priv->plat.shift = 2;
> + /*
> + * We double the clock rate since the 16550 will divide by 16
> + * (instead of 8 required by the BCM2835 peripheral manual)
> + */
> + priv->plat.clock = priv->plat.clock*2;
> + ns16550_serial_init_port(cdev);
> +}
> +
> /*********** Exposed Functions **********************************/
>
> /**
> @@ -353,6 +367,11 @@ static __maybe_unused struct ns16550_drvdata tegra_drvdata = {
> .linux_console_name = "ttyS",
> };
>
> +static __maybe_unused struct ns16550_drvdata rpi_drvdata = {
> + .init_port = rpi_init_port,
> + .linux_console_name = "ttyS",
> +};
> +
> static int ns16550_init_iomem(struct device_d *dev, struct ns16550_priv *priv)
> {
> struct resource *iores;
> @@ -528,6 +547,12 @@ static struct of_device_id ns16550_serial_dt_ids[] = {
> .data = &jz_drvdata,
> },
> #endif
> +#if IS_ENABLED(CONFIG_MACH_RPI_COMMON)
> + {
> + .compatible = "brcm,bcm2835-aux-uart",
> + .data = &rpi_drvdata,
> + },
> +#endif
> {
> /* sentinel */
> },
> --
> git-series 0.9.1
>
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--
Roland Hieber | r.hieber@xxxxxxxxxxxxxx |
Pengutronix e.K. | https://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim | Phone: +49-5121-206917-5086 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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