[lkml]   [2017]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 2/5] cpufreq: imx6q: Fix handling EPROBE_DEFER from regulator
From: Irina Tirdea <>

If there are any errors in getting the cpu0 regulators, the driver returns
-ENOENT. In case the regulators are not yet available, the devm_regulator_get
calls will return -EPROBE_DEFER, so that the driver can be probed later.
If we return -ENOENT, the driver will fail its initialization and will
not try to probe again (when the regulators become available).

Return the actual error received from regulator_get in probe. Print a
differentiated message in case we need to probe the device later and
in case we actually failed. Also add a message to inform when the
driver has been successfully registered.

Signed-off-by: Irina Tirdea <>
Signed-off-by: Leonard Crestez <>
Acked-by: Viresh Kumar <>
drivers/cpufreq/imx6q-cpufreq.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 7719b02..be90ee3 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -222,6 +222,13 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
arm_reg = regulator_get(cpu_dev, "arm");
pu_reg = regulator_get_optional(cpu_dev, "pu");
soc_reg = regulator_get(cpu_dev, "soc");
+ if (PTR_ERR(arm_reg) == -EPROBE_DEFER ||
+ PTR_ERR(soc_reg) == -EPROBE_DEFER ||
+ PTR_ERR(pu_reg) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ dev_dbg(cpu_dev, "regulators not ready, defer\n");
+ goto put_reg;
+ }
if (IS_ERR(arm_reg) || IS_ERR(soc_reg)) {
dev_err(cpu_dev, "failed to get regulators\n");
ret = -ENOENT;
 \ /
  Last update: 2017-03-31 21:29    [W:0.129 / U:1.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site