brcm63xx: add clkdev lookup support

Add clockdev lookup support for easier providing of clocks for
devices.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.4/001-4.15-04-tty-bcm63xx_uart-allow-naming-clock-in-device-tree.patch b/target/linux/brcm63xx/patches-4.4/001-4.15-04-tty-bcm63xx_uart-allow-naming-clock-in-device-tree.patch
new file mode 100644
index 0000000000..b3f73cf318
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.4/001-4.15-04-tty-bcm63xx_uart-allow-naming-clock-in-device-tree.patch
@@ -0,0 +1,55 @@
+From 317f8659bba01b307cbe4e9902d4e3d333fd7164 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Sun, 16 Jul 2017 12:39:17 +0200
+Subject: [PATCH V2 4/8] tty/bcm63xx_uart: allow naming clock in device tree
+
+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).
+
+Acked-by: Rob Herring <robh@kernel.org>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+ Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt | 6 ++++++
+ drivers/tty/serial/bcm63xx_uart.c                              | 6 ++++--
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+
+--- a/Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt
++++ b/Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt
+@@ -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 {
+--- a/drivers/tty/serial/bcm63xx_uart.c
++++ b/drivers/tty/serial/bcm63xx_uart.c
+@@ -837,8 +837,10 @@ static int bcm_uart_probe(struct platfor
+ 	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;
+