From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH 1/6] mach-bcm2835/core: add clkdev for uart1
Date: Wed, 12 Dec 2018 15:10:49 +0100 [thread overview]
Message-ID: <20181212141054.7513-2-r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <20181212141054.7513-1-r.czerwinski@pengutronix.de>
Add a clkdev for uart1 which will be used on the Raspberry Pi 3.
Double the clockrate since the ns16550 driver used for the uart will divide by
16, while the bcm2835 peripheral manual describes that the bcm2835 miniuart will
only divide by 8.
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
arch/arm/mach-bcm283x/core.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm/mach-bcm283x/core.c b/arch/arm/mach-bcm283x/core.c
index f1dcda86f..66af76b09 100644
--- a/arch/arm/mach-bcm283x/core.c
+++ b/arch/arm/mach-bcm283x/core.c
@@ -42,6 +42,12 @@ static int bcm2835_clk_init(void)
clk_register_clkdev(clk, NULL, "uart0-pl0110");
clkdev_add_physbase(clk, 0x20201000, NULL);
clkdev_add_physbase(clk, 0x3f201000, NULL);
+ /*
+ * We double the clock rate since the 16550 will divide by 16
+ * (instead of 8 required by the BCM2835 peripheral manual)
+ */
+ clk = clk_fixed("uart1-8250", 500 * 1000 * 1000);
+ clkdev_add_physbase(clk, 0x3f215040, NULL);
clk = clk_fixed("bcm2835-cs", 1 * 1000 * 1000);
clk_register_clkdev(clk, NULL, "bcm2835-cs");
--
2.11.0
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next prev parent reply other threads:[~2018-12-12 14:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 14:10 [PATCH 0/6] Raspberry Pi miniuart support Rouven Czerwinski
2018-12-12 14:10 ` Rouven Czerwinski [this message]
2018-12-12 14:22 ` [PATCH 1/6] mach-bcm2835/core: add clkdev for uart1 Lucas Stach
2018-12-12 14:58 ` Rouven Czerwinski
2018-12-12 14:10 ` [PATCH 2/6] serial_ns16550: handle default reg-io-width Rouven Czerwinski
2018-12-12 14:10 ` [PATCH 3/6] serial_ns16550: add raspberry pi compatible and init Rouven Czerwinski
2018-12-13 7:14 ` Sascha Hauer
2018-12-12 14:10 ` [PATCH 4/6] ARM: rpi: add NS16550 support Rouven Czerwinski
2018-12-12 14:10 ` [PATCH 5/6] bcm2837-rpi-3: choose miniuart as stdout Rouven Czerwinski
2018-12-12 14:10 ` [PATCH 6/6] doc: bcm283x: remove miniuart overlay instruction Rouven Czerwinski
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