On Wed, 2020-12-23 at 17:29 +0900, Tomasz Figa wrote:

On Wed, Dec 09, 2020 at 04:00:51PM +0800, Yong Wu wrote:

quoted

In the lastest SoC, M4U has its special power domain. thus, If the engine
begin to work, it should help enable the power for M4U firstly.
Currently if the engine work, it always enable the power/clocks for
smi-larbs/smi-common. This patch adds device_link for smi-common and M4U.
then, if smi-common power is enabled, the M4U power also is powered on
automatically.

Normally M4U connect with several smi-larbs and their smi-common always
are the same, In this patch it get smi-common dev from the first smi-larb
device(i==0), then add the device_link only while m4u has power-domain.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 30 ++++++++++++++++++++++++++++--
 drivers/iommu/mtk_iommu.h |  1 +
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 09c8c58feb78..5614015e5b96 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c

@@ -20,6 +20,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>

@@ -706,7 +707,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 		return larb_nr;
 
 	for (i = 0; i < larb_nr; i++) {
-		struct device_node *larbnode;
+		struct device_node *larbnode, *smicomm_node;
 		struct platform_device *plarbdev;
 		u32 id;
 

@@ -732,6 +733,26 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 
 		component_match_add_release(dev, &match, release_of,
 					    compare_of, larbnode);
+		if (i != 0)
+			continue;

How about using the last larb instead and moving the code below outside
of the loop?

Of course OK. Thanks.

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