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mmc: core: improve mmc_of_parse_voltage() to return better status 

Improve mmc_of_parse_voltage()'s return values so that drivers can tell
whether a voltage-range specification was present, and whether it has
been successfully parsed, or there was an error while parsing.

We return a negative errno when parsing fails, zero if no voltage-range
specification is present, or one if a voltage-range specification is
successfully parsed.

No users need modifying as no users check the return value.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Russell King 2016-01-29 09:43:55 +00:00 committed by Ulf Hansson
parent 10a16a01d8
commit cf925747d2
1 changed files with 5 additions and 4 deletions
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9
drivers/mmc/core/core.c
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@ -1204,8 +1204,9 @@ EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
* @np: The device node need to be parsed.
* @mask: mask of voltages available for MMC/SD/SDIO
*
* 1. Return zero on success.
* 2. Return negative errno: voltage-range is invalid.
* Parse the "voltage-ranges" DT property, returning zero if it is not
* found, negative errno if the voltage-range specification is invalid,
* or one if the voltage-range is specified and successfully parsed.
*/
int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
{
@ -1216,7 +1217,7 @@ int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
if (!voltage_ranges) {
pr_debug("%s: voltage-ranges unspecified\n", np->full_name);
return -EINVAL;
return 0;
}
if (!num_ranges) {
pr_err("%s: voltage-ranges empty\n", np->full_name);
@ -1238,7 +1239,7 @@ int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
*mask |= ocr_mask;
}
return 0;
return 1;
}
EXPORT_SYMBOL(mmc_of_parse_voltage);