[PATCH 4/8] iio: adc: axi-adc: make sure AXI clock is enabled

From: Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@kernel.org>
To: linux-iio@vger.kernel.org, devicetree@vger.kernel.org
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	 Alexandru Ardelean <alexandru.ardelean@analog.com>,
	 Lars-Peter Clausen <lars@metafoo.de>,
	 Michael Hennerich <Michael.Hennerich@analog.com>,
	 Jonathan Cameron <jic23@kernel.org>,
	Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	 Olivier Moysan <olivier.moysan@foss.st.com>,
	Nuno Sa <nuno.sa@analog.com>
Subject: [PATCH 4/8] iio: adc: axi-adc: make sure AXI clock is enabled
Date: Fri, 19 Apr 2024 17:36:47 +0200	[thread overview]
Message-ID: <20240419-ad9467-new-features-v1-4-3e7628ff6d5e@analog.com> (raw)
In-Reply-To: <20240419-ad9467-new-features-v1-0-3e7628ff6d5e@analog.com>

From: Nuno Sa <nuno.sa@analog.com>

We can only access the IP core registers if the bus clock is enabled. As
such we need to get and enable it and not rely on anyone else to do it.

Signed-off-by: Nuno Sa <nuno.sa@analog.com>
---
 drivers/iio/adc/adi-axi-adc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index a543b91124b07..e3b2158829416 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -175,6 +175,7 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
 	struct adi_axi_adc_state *st;
 	void __iomem *base;
 	unsigned int ver;
+	struct clk *clk;
 	int ret;
 
 	st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);
@@ -195,6 +196,10 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
 	if (!expected_ver)
 		return -ENODEV;
 
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
 	/*
 	 * Force disable the core. Up to the frontend to enable us. And we can
 	 * still read/write registers...

-- 
2.44.0


