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[v5,13/22] ARM: dts: exynos: Enable UART3 on Exynos5410

Message ID CAOi56cXeRjGgE+=psk7K45oeAgZ27HFxbi+an-ELnA3-_Z_BTA@mail.gmail.com
State New
Headers show

Commit Message

Kevin Hilman June 1, 2016, 7:57 p.m. UTC 
Hi Krzysztof,

On Sat, May 28, 2016 at 2:54 AM, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> Just like other Exynos5 family SoCs, this one has four UARTs. Configure

> clocks for UART3 and enable it.

>

> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>


This patch landed in linux-next[1] and kernelci.org found a boot
regression on the exynos5410-odroidxu[2], where it looks like it's
faulting in clk_prepare().  Bisecting pointed to this patch.  I added
"status = disabled" back into the DTS on top of next-20160601[3] and
verified my odroid-XU to be booting fine again.

Kevin

[1] 594127ada6df ARM: dts: exynos: Enable UART3 on Exynos5410
[2] https://kernelci.org/boot/exynos5410-odroidxu/job/next/kernel/next-20160601/defconfig/multi_v7_defconfig/lab/lab-baylibre-seattle/?_id=574e97c759b5140f4141c8ef
[3] diff --git a/arch/arm/boot/dts/exynos5410.dtsi
b/arch/arm/boot/dts/exynos5410.dtsi
index a937d9bdad90..f4baf1d1e864 100644
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Patch

--- a/arch/arm/boot/dts/exynos5410.dtsi
+++ b/arch/arm/boot/dts/exynos5410.dtsi
@@ -238,6 +238,7 @@ 
 };

 &serial_3 {
+       status = "disabled";
        clocks = <&clock CLK_UART3>, <&clock CLK_SCLK_UART3>;
        clock-names = "uart", "clk_uart_baud0";
 };