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From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH v5 5/9] serial_ns16550: add raspberry pi compatible and init
Date: Tue, 18 Dec 2018 11:47:40 +0100	[thread overview]
Message-ID: <1ce9b3de1464acae378eaaae5324b724d187f1a6.1545130027.git-series.r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <cover.61efbc8cc3e2f39adccce96b40af1bb32a30bc66.1545130027.git-series.r.czerwinski@pengutronix.de>

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@pengutronix.de>
---
 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);
+	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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  parent reply	other threads:[~2018-12-18 10:48 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-18 10:47 [PATCH v5 0/9] Raspberry Pi miniuart support Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 1/9] ARM: rpi: fix typo in rpi-common.c Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 2/9] ARM: rpi: move clks into board specific rpi-common Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 3/9] ARM: rpi: retrieve miniuart clock from firmware Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 4/9] serial_ns16550: handle default reg-io-width Rouven Czerwinski
2018-12-18 10:47 ` Rouven Czerwinski [this message]
2018-12-18 10:47 ` [PATCH v5 6/9] ARM: rpi: add NS16550 support Rouven Czerwinski
2018-12-19 11:26   ` Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 7/9] ARM: rpi: choose miniuart as stdout Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 8/9] doc: bcm283x: remove miniuart overlay instruction Rouven Czerwinski
2018-12-18 10:47 ` [PATCH v5 9/9] ARM: rpi: use defines for uart bases Rouven Czerwinski
2018-12-18 14:06 ` [PATCH v5 0/9] Raspberry Pi miniuart support Sascha Hauer
2018-12-18 14:26   ` Peter Korsgaard
2018-12-19  5:21     ` Rouven Czerwinski
2018-12-19  8:29       ` Peter Korsgaard
2018-12-19  8:37         ` Rouven Czerwinski
2018-12-19 11:28         ` Rouven Czerwinski

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