On 4/29/2014 11:49 AM, Yegor Yefremov wrote:
On Thu, Apr 24, 2014 at 11:11 PM, Ezequiel Garcia
<[email protected]> wrote:
The DMA controller is needed for the USB controller to be correctly
registered. Therefore, if the DMA node is located at the end an unecessary
probe deferral is produced systematically.
This is easily fixed by moving the node at the beggining of the child list,
so it's probed first.
This will give issues on module removal.
Since we use device_for_each_child in remove patch, it will try to
remove cppi dma controller, while the channel
is still in use by musb node.
Signed-off-by: Ezequiel Garcia <[email protected]>
Tested-by: Yegor Yefremov <[email protected]>
--
v1->v2:
* Added a comment to prevent a future clean-up based on the memory offset.
arch/arm/boot/dts/am33xx.dtsi | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index 9770e35..02e1eb6 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -453,6 +453,26 @@
ti,hwmods = "usb_otg_hs";
status = "disabled";
+ /*
+ * The probe order matches the child ordering so the
+ * dma-controller node must be the first one to prevent
+ * spurious probe deferrals.
+ */
+ cppi41dma: dma-controller@47402000 {
+ compatible = "ti,am3359-cppi41";
+ reg = <0x47400000 0x1000
+ 0x47402000 0x1000
+ 0x47403000 0x1000
+ 0x47404000 0x4000>;
+ reg-names = "glue", "controller", "scheduler",
"queuemgr";
+ interrupts = <17>;
+ interrupt-names = "glue";
+ #dma-cells = <2>;
+ #dma-channels = <30>;
+ #dma-requests = <256>;
+ status = "disabled";
+ };
+
usb_ctrl_mod: control@44e10620 {
compatible = "ti,am335x-usb-ctrl-module";
reg = <0x44e10620 0x10
@@ -556,20 +576,6 @@
"tx14", "tx15";
};
- cppi41dma: dma-controller@47402000 {
- compatible = "ti,am3359-cppi41";
- reg = <0x47400000 0x1000
- 0x47402000 0x1000
- 0x47403000 0x1000
- 0x47404000 0x4000>;
- reg-names = "glue", "controller", "scheduler",
"queuemgr";
- interrupts = <17>;
- interrupt-names = "glue";
- #dma-cells = <2>;
- #dma-channels = <30>;
- #dma-requests = <256>;
- status = "disabled";
- };
};
epwmss0: epwmss@48300000 {
--
1.9.1
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--
-George
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