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tty/bcm63xx_uart: allow naming clock in device tree

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Codify using a named clock for the refclk of the uart. This makes it
easier if we might need to add a gating clock (like present on the
BCM6345).

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-mips@linux-mips.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-serial@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: bcm-kernel-feedback-list@broadcom.com
Patchwork: https://patchwork.linux-mips.org/patch/17328/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: James Hogan <jhogan@kernel.org>
This commit is contained in:
Jonas Gorski 2017-09-20 13:14:04 +02:00 committed by James Hogan
parent 9a9cc02a6a
commit fa1e6a8aec
2 changed files with 10 additions and 2 deletions
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6
Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt
View file

@ -11,6 +11,11 @@ Required properties:
- clocks: Clock driving the hardware; used to figure out the baud rate
divisor.
Optional properties:
- clock-names: Should be "refclk".
Example:
uart0: serial@14e00520 {
@ -19,6 +24,7 @@ Example:
interrupt-parent = <&periph_intc>;
interrupts = <2>;
clocks = <&periph_clk>;
clock-names = "refclk";
};
clocks {

6
drivers/tty/serial/bcm63xx_uart.c
View file

@ -846,8 +846,10 @@ static int bcm_uart_probe(struct platform_device *pdev)
if (!res_irq)
return -ENODEV;
clk = pdev->dev.of_node ? of_clk_get(pdev->dev.of_node, 0) :
clk_get(&pdev->dev, "refclk");
clk = clk_get(&pdev->dev, "refclk");
if (IS_ERR(clk) && pdev->dev.of_node)
clk = of_clk_get(pdev->dev.of_node, 0);
if (IS_ERR(clk))
return -ENODEV;