linux-kernel - [PATCH 4.4 247/312] dmaengine: edma: Add probe callback to edma_tptc

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Date:   Fri,  8 May 2020 14:33:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Ujfalusi <peter.ujfalusi@...com>,
        Vinod Koul <vinod.koul@...el.com>
Subject: [PATCH 4.4 247/312] dmaengine: edma: Add probe callback to edma_tptc_driver

From: Peter Ujfalusi <peter.ujfalusi@...com>

commit 4fa2d09c1ae879c2ee2760ab419a4f97026dd97b upstream.

Due to changes in device and platform code drivers w/o probe will fail to
load. This means that the devices for eDMA TPTCs are goign to be without
driver and omap hwmod code will turn them off after the kernel finished
loading:
[    3.015900] platform 49800000.tptc: omap_device_late_idle: enabled but no driver.  Idling
[    3.024671] platform 49a00000.tptc: omap_device_late_idle: enabled but no driver.  Idling

This will prevent eDMA to work since the TPTCs are not enabled.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Fixes: 34635b1accb9 ("dmaengine: edma: Add dummy driver skeleton for edma3-tptc")
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/edma.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -2439,7 +2439,13 @@ static struct platform_driver edma_drive
 	},
 };
 
+static int edma_tptc_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
 static struct platform_driver edma_tptc_driver = {
+	.probe		= edma_tptc_probe,
 	.driver = {
 		.name	= "edma3-tptc",
 		.of_match_table = edma_tptc_of_ids,