From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gZ64r-0001jh-3j for barebox@lists.infradead.org; Tue, 18 Dec 2018 03:29:50 +0000 Date: Tue, 18 Dec 2018 04:29:37 +0100 From: Roland Hieber Message-ID: <20181218032937.otaph6c5yo3lxny7@pengutronix.de> References: <1ce9b3de1464acae378eaaae5324b724d187f1a6.1545034218.git-series.r.czerwinski@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1ce9b3de1464acae378eaaae5324b724d187f1a6.1545034218.git-series.r.czerwinski@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH v4 4/7] serial_ns16550: add raspberry pi compatible and init To: Rouven Czerwinski Cc: barebox@lists.infradead.org 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 > --- > 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 > > _______________________________________________ > barebox mailing list > barebox@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/barebox > -- Roland Hieber | r.hieber@pengutronix.de | 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 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox