[PATCHv2] phy: mediatek: tphy: simplify main allocation

[PATCHv2] phy: mediatek: tphy: simplify main allocation

[Rosen Penev]

Use a flexible array member to replace kzalloc + kcalloc with a single
kzalloc.

Shuffled some code around as __counted_by requires the counting variable
to be assigned first.

Removed NULL check from of_get_match_data as it's never NULL per the
device table.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 v2: add back NULL check
 drivers/phy/mediatek/phy-mtk-tphy.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index acf506529507..e9b9e667b319 100644
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -340,10 +340,10 @@ struct mtk_tphy {
 	struct device *dev;
 	void __iomem *sif_base;	/* only shared sif */
 	const struct mtk_phy_pdata *pdata;
-	struct mtk_phy_instance **phys;
-	int nphys;
 	int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
 	int src_coef; /* coefficient for slew rate calibrate */
+	int nphys;
+	struct mtk_phy_instance *phys[] __counted_by(nphys);
 };
 
 #if IS_ENABLED(CONFIG_DEBUG_FS)
@@ -1572,22 +1572,19 @@ static int mtk_tphy_probe(struct platform_device *pdev)
 	struct mtk_tphy *tphy;
 	struct resource res;
 	int port, ret;
+	size_t nphys;
 
-	tphy = devm_kzalloc(dev, sizeof(*tphy), GFP_KERNEL);
+	nphys = of_get_child_count(np);
+	tphy = devm_kzalloc(dev, struct_size(tphy, phys, nphys), GFP_KERNEL);
 	if (!tphy)
 		return -ENOMEM;
 
+	tphy->nphys = nphys;
+	tphy->dev = dev;
 	tphy->pdata = of_device_get_match_data(dev);
 	if (!tphy->pdata)
 		return -EINVAL;
 
-	tphy->nphys = of_get_child_count(np);
-	tphy->phys = devm_kcalloc(dev, tphy->nphys,
-				       sizeof(*tphy->phys), GFP_KERNEL);
-	if (!tphy->phys)
-		return -ENOMEM;
-
-	tphy->dev = dev;
 	platform_set_drvdata(pdev, tphy);
 
 	sif_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
2.55.0

Re: [PATCHv2] phy: mediatek: tphy: simplify main allocation

[Manivannan Sadhasivam]

On Wed, Aug 12, 2026 at 11:18:57AM -0700, Rosen Penev wrote:
> Use a flexible array member to replace kzalloc + kcalloc with a single
> kzalloc.
> 
> Shuffled some code around as __counted_by requires the counting variable
> to be assigned first.
> 
> Removed NULL check from of_get_match_data as it's never NULL per the
> device table.
> 

This statement is stale in v2 :(

- Mani

-- 
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