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iio: adc: axi-adc: make sure AXI clock is enabled

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commit 80721776c5af6f6dce7d84ba8df063957aa425a2 upstream.

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.

Note this clock is a very fundamental one that is typically enabled
pretty early during boot. Independently of that, we should really rely on
it to be enabled.

Fixes: ef04070692a2 ("iio: adc: adi-axi-adc: add support for AXI ADC IP core")
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240426-ad9467-new-features-v2-4-6361fc3ba1cc@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nuno Sa 2024-04-26 17:42:13 +02:00 committed by Greg Kroah-Hartman
parent 33187fa1a8
commit 955c824d54
1 changed files with 5 additions and 0 deletions
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5
drivers/iio/adc/adi-axi-adc.c
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@ -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...