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 <[email protected]> --- 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 8ddcfdbef..7a4054a67 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); + 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 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; @@ -527,6 +546,12 @@ static struct of_device_id ns16550_serial_dt_ids[] = { .compatible = "ingenic,jz4740-uart", .data = &jz_drvdata, }, +#endif +#if IS_ENABLED(CONFIG_MACH_RPI_COMMON) + { + .compatible = "brcm,bcm2835-aux-uart", + .data = &rpi_drvdata, + }, #endif { /* sentinel */ -- 2.19.1 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
