target/linux/brcm63xx/patches-4.9/001-4.15-04-tty-bcm63xx_uart-allow-naming-clock-in-device-tree.patch

   1 From 317f8659bba01b307cbe4e9902d4e3d333fd7164 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jonas.gorski@gmail.com>
   3 Date: Sun, 16 Jul 2017 12:39:17 +0200
   4 Subject: [PATCH V2 4/8] tty/bcm63xx_uart: allow naming clock in device tree
   5
   6 Codify using a named clock for the refclk of the uart. This makes it
   7 easier if we might need to add a gating clock (like present on the
   8 BCM6345).
   9
  10 Acked-by: Rob Herring <robh@kernel.org>
  11 Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  12 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  13 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  14 ---
  15  Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt | 6 ++++++
  16  drivers/tty/serial/bcm63xx_uart.c                              | 6 ++++--
  17  2 files changed, 10 insertions(+), 2 deletions(-)
  18
  19 --- a/Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt
  20 +++ b/Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.txt
  21 @@ -11,6 +11,11 @@ Required properties:
  22  - clocks: Clock driving the hardware; used to figure out the baud rate
  23    divisor.
  24
  25 +
  26 +Optional properties:
  27 +
  28 +- clock-names: Should be "refclk".
  29 +
  30  Example:
  31
  32         uart0: serial@14e00520 {
  33 @@ -19,6 +24,7 @@ Example:
  34                 interrupt-parent = <&periph_intc>;
  35                 interrupts = <2>;
  36                 clocks = <&periph_clk>;
  37 +               clock-names = "refclk";
  38         };
  39
  40         clocks {
  41 --- a/drivers/tty/serial/bcm63xx_uart.c
  42 +++ b/drivers/tty/serial/bcm63xx_uart.c
  43 @@ -841,8 +841,10 @@ static int bcm_uart_probe(struct platfor
  44         if (!res_irq)
  45                 return -ENODEV;
  46
  47 -       clk = pdev->dev.of_node ? of_clk_get(pdev->dev.of_node, 0) :
  48 -                                 clk_get(&pdev->dev, "refclk");
  49 +       clk = clk_get(&pdev->dev, "refclk");
  50 +       if (IS_ERR(clk) && pdev->dev.of_node)
  51 +               clk = of_clk_get(pdev->dev.of_node, 0);
  52 +
  53         if (IS_ERR(clk))
  54                 return -ENODEV;
  55