When the 'adck-max-frequency' property is not passed in device tree,
the following division by zero is seen:
[ 2.196814] Hardware name: Freescale i.MX6 SoloX (Device Tree)
[ 2.202652] Backtrace:
[ 2.205156] [<c0013600>] (dump_backtrace) from [<c001379c>] (show_stack+0x18/0x1c)
[ 2.212730] r6:ef138410 r5:00000000 r4:00000000 r3:00000000
[ 2.218494] [<c0013784>] (show_stack) from [<c02d8220>] (dump_stack+0x88/0xa4)
[ 2.225756] [<c02d8198>] (dump_stack) from [<c001346c>] (__div0+0x18/0x20)
[ 2.232636] r5:00000001 r4:eeb0a800
[ 2.236286] [<c0013454>] (__div0) from [<c02d6be4>] (Ldiv0+0x8/0x10)
[ 2.242657] [<c0574574>] (vf610_adc_probe) from [<c03c9274>] (platform_drv_probe+0x58/0xb4)
Provide a sane adck_rate default value that can be used in normal,
high-speed and low-power modes in the case of 'adck-max-frequency' property
being absent.
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
---
drivers/iio/adc/vf610_adc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 599cde3..424fd69 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -105,6 +105,7 @@
#define VF610_ADC_TIMEOUT msecs_to_jiffies(100)
#define DEFAULT_SAMPLE_TIME 1000
+#define ADCK_RATE_MAX_DEFAULT 20000000
enum clk_sel {
VF610_ADCIOC_BUSCLK_SET,
@@ -195,6 +196,7 @@ static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
} else {
/* fall-back value using a safe divisor */
adc_feature->clk_div = 8;
+ adck_rate = ADCK_RATE_MAX_DEFAULT;
}
/*
--
1.9.1
--
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