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authorLinus Walleij <linus.walleij@linaro.org>2017-01-13 10:53:55 +0100
committerLee Jones <lee.jones@linaro.org>2017-02-13 09:29:43 +0000
commit7e9c40c63933a643908d686bd89dfc2315e8c70a (patch)
tree0ef088b8bcc08a554810e85d24acacd4a107bd20 /drivers/mfd
parentf80e78aa11ad754de20104233af1ce4cea8f16a5 (diff)
downloadlinux-7e9c40c63933a643908d686bd89dfc2315e8c70a.tar.bz2
mfd: ab8500-sysctrl: Handle probe deferral
In the current boot, clients making use of the AB8500 sysctrl may be probed before the ab8500-sysctrl driver. This gives them -EINVAL, but should rather give -EPROBE_DEFER. Before this, the abx500 clock driver didn't probe properly, and as a result the codec driver in turn using the clocks did not probe properly. After this patch, everything probes properly. Also add OF compatible-string probing. This driver is all device tree, so let's just make a drive-by-fix of that as well. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/ab8500-sysctrl.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index 80c0efa66ac1..5b0a0850ef69 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -101,7 +101,7 @@ int ab8500_sysctrl_read(u16 reg, u8 *value)
u8 bank;
if (sysctrl_dev == NULL)
- return -EINVAL;
+ return -EPROBE_DEFER;
bank = (reg >> 8);
if (!valid_bank(bank))
@@ -117,11 +117,13 @@ int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
u8 bank;
if (sysctrl_dev == NULL)
- return -EINVAL;
+ return -EPROBE_DEFER;
bank = (reg >> 8);
- if (!valid_bank(bank))
+ if (!valid_bank(bank)) {
+ pr_err("invalid bank\n");
return -EINVAL;
+ }
return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
(u8)(reg & 0xFF), mask, value);
@@ -148,9 +150,15 @@ static int ab8500_sysctrl_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id ab8500_sysctrl_match[] = {
+ { .compatible = "stericsson,ab8500-sysctrl", },
+ {}
+};
+
static struct platform_driver ab8500_sysctrl_driver = {
.driver = {
.name = "ab8500-sysctrl",
+ .of_match_table = ab8500_sysctrl_match,
},
.probe = ab8500_sysctrl_probe,
.remove = ab8500_sysctrl_remove,