linux-kernel - [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

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Message-ID: <20250108110620.86900-6-kkartik@nvidia.com>
Date: Wed, 8 Jan 2025 16:36:20 +0530
From: Kartik Rajput <kkartik@...dia.com>
To: <akhilrajeev@...dia.com>, <andi.shyti@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <thierry.reding@...il.com>,
	<jonathanh@...dia.com>, <ldewangan@...dia.com>, <digetx@...il.com>,
	<linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

On Tegra264, not all I2C controllers support DMA, this causes failures
when function tegra_i2c_init_dma() is called.

Ensure that "dmas" device-tree property is present before initializing
DMA in function tegra_i2c_init_dma().

Signed-off-by: Kartik Rajput <kkartik@...dia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index a5974af5b1af..9957802fa4ed 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -546,6 +546,9 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
 	if (IS_VI(i2c_dev))
 		return 0;
 
+	if (!device_property_present(i2c_dev->dev, "dmas"))
+		return 0;
+
 	if (i2c_dev->hw->has_apb_dma) {
 		if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
 			dev_dbg(i2c_dev->dev, "APB DMA support not enabled\n");
-- 
2.43.0