linux-kernel - [PATCH] regulator: rt5033: Fix n_voltages settings for BUCK and LDO

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Message-Id: <20210627080418.1718127-1-axel.lin@ingics.com>
Date:   Sun, 27 Jun 2021 16:04:18 +0800
From:   Axel Lin <axel.lin@...ics.com>
To:     Mark Brown <broonie@...nel.org>, Lee Jones <lee.jones@...aro.org>
Cc:     ChiYuan Huang <cy_huang@...htek.com>,
        Beomho Seo <beomho.seo@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Axel Lin <axel.lin@...ics.com>
Subject: [PATCH] regulator: rt5033: Fix n_voltages settings for BUCK and LDO

For linear regulators, the n_voltages should be (max - min) / step + 1.

Buck voltage from 1v to 3V, per step 100mV, and vout mask is 0x1f.
If value is from 20 to 31, the voltage will all be fixed to 3V.
And LDO also, just vout range is different from 1.2v to 3v, step is the
same. If value is from 18 to 31, the voltage will also be fixed to 3v.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
Reviewed-by: ChiYuan Huang <cy_huang@...htek.com>
---
ChiYuan helps to check the datasheet, so add his reviewed-by tag.
BTW, althought the changes is in mfd include file but the actually impact
is in regulator driver. So I add regulator prefix in the patch.

 include/linux/mfd/rt5033-private.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mfd/rt5033-private.h b/include/linux/mfd/rt5033-private.h
index 2d1895c3efbf..40a0c2dfb80f 100644
--- a/include/linux/mfd/rt5033-private.h
+++ b/include/linux/mfd/rt5033-private.h
@@ -200,13 +200,13 @@ enum rt5033_reg {
 #define RT5033_REGULATOR_BUCK_VOLTAGE_MIN		1000000U
 #define RT5033_REGULATOR_BUCK_VOLTAGE_MAX		3000000U
 #define RT5033_REGULATOR_BUCK_VOLTAGE_STEP		100000U
-#define RT5033_REGULATOR_BUCK_VOLTAGE_STEP_NUM		32
+#define RT5033_REGULATOR_BUCK_VOLTAGE_STEP_NUM		21
 
 /* RT5033 regulator LDO output voltage uV */
 #define RT5033_REGULATOR_LDO_VOLTAGE_MIN		1200000U
 #define RT5033_REGULATOR_LDO_VOLTAGE_MAX		3000000U
 #define RT5033_REGULATOR_LDO_VOLTAGE_STEP		100000U
-#define RT5033_REGULATOR_LDO_VOLTAGE_STEP_NUM		32
+#define RT5033_REGULATOR_LDO_VOLTAGE_STEP_NUM		19
 
 /* RT5033 regulator SAFE LDO output voltage uV */
 #define RT5033_REGULATOR_SAFE_LDO_VOLTAGE		4900000U
-- 
2.25.1