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mfd: ab8500-sysctrl: Handle probe deferral

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[ Upstream commit 7e9c40c63933a643908d686bd89dfc2315e8c70a ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij 2017-10-07 22:37:44 +00:00 committed by Greg Kroah-Hartman
parent ed414aeb52
commit 8800aba502
1 changed files with 11 additions and 3 deletions
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14
drivers/mfd/ab8500-sysctrl.c
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@ -99,7 +99,7 @@ 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))
@ -115,11 +115,13 @@ 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);
@ -180,9 +182,15 @@ 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,