regulator: bd718x7, bd71828, Fix dvs voltage levels

stable inclusion
from stable-5.10.20
commit 3604dfd1c60a100e67e24a555834c8699a10a1c3
bugzilla: 50608

--------------------------------

[ Upstream commit c2945541 ]

The ROHM BD718x7 and BD71828 drivers support setting HW state
specific voltages from device-tree. This is used also by various
in-tree DTS files.

These drivers do incorrectly try to compose bit-map using enum
values. By a chance this works for first two valid levels having
values 1 and 2 - but setting values for the rest of the levels
do indicate capability of setting values for first levels as
well. Luckily the regulators which support setting values for
SUSPEND/LPSR do usually also support setting values for RUN
and IDLE too - thus this has not been such a fatal issue.

Fix this by defining the old enum values as bits and fixing the
parsing code. This allows keeping existing IC specific drivers
intact and only slightly changing the rohm-regulator.c

Fixes: 21b72156 ("regulator: bd718x7: Split driver to common and bd718x7 specific parts")
Signed-off-by: NMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210212080023.GA880728@localhost.localdomainSigned-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/regulator/rohm-regulator.c

@@ -52,9 +52,12 @@ int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
 	char *prop;
 	unsigned int reg, mask, omask, oreg = desc->enable_reg;
 
-	for (i = 0; i < ROHM_DVS_LEVEL_MAX && !ret; i++) {
-		if (dvs->level_map & (1 << i)) {
-			switch (i + 1) {
+	for (i = 0; i < ROHM_DVS_LEVEL_VALID_AMOUNT && !ret; i++) {
+		int bit;
+
+		bit = BIT(i);
+		if (dvs->level_map & bit) {
+			switch (bit) {
 			case ROHM_DVS_LEVEL_RUN:
 				prop = "rohm,dvs-run-voltage";
 				reg = dvs->run_reg;

include/linux/mfd/rohm-generic.h

@@ -20,14 +20,12 @@ struct rohm_regmap_dev {
 	struct regmap *regmap;
 };
 
-enum {
-	ROHM_DVS_LEVEL_UNKNOWN,
-	ROHM_DVS_LEVEL_RUN,
-	ROHM_DVS_LEVEL_IDLE,
-	ROHM_DVS_LEVEL_SUSPEND,
-	ROHM_DVS_LEVEL_LPSR,
-	ROHM_DVS_LEVEL_MAX = ROHM_DVS_LEVEL_LPSR,
-};
+#define ROHM_DVS_LEVEL_RUN		BIT(0)
+#define ROHM_DVS_LEVEL_IDLE		BIT(1)
+#define ROHM_DVS_LEVEL_SUSPEND		BIT(2)
+#define ROHM_DVS_LEVEL_LPSR		BIT(3)
+#define ROHM_DVS_LEVEL_VALID_AMOUNT	4
+#define ROHM_DVS_LEVEL_UNKNOWN		0
 
 /**
  * struct rohm_dvs_config - dynamic voltage scaling register descriptions