6.9-stable review patch. If anyone has any objections, please let me know.
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From: Nuno Sa nuno.sa@analog.com
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@ana... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/adi-axi-adc.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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 plat 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 plat 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...