linux-kernel - Re: [RFT][PATCH 1/2] regulator: lm363x: Fix off-by-one n_voltages for lm3632 ldo_vpos/ldo

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Date:   Tue, 16 Jul 2019 13:08:48 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Axel Lin <axel.lin@...ics.com>
CC:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFT][PATCH 1/2] regulator: lm363x: Fix off-by-one n_voltages for
 lm3632 ldo_vpos/ldo_vneg

Axel

On 7/7/19 9:02 PM, Axel Lin wrote:
> Axel Lin <axel.lin@...ics.com> 於 2019年6月26日 週三 下午11:12寫道：
>> Dan Murphy <dmurphy@...com> 於 2019年6月26日 週三 下午11:07寫道：
>>> Hello
>>>
>>> On 6/26/19 8:26 AM, Axel Lin wrote:
>>>> According to the datasheet https://www.ti.com/lit/ds/symlink/lm3632a.pdf
>>>> Table 20. VPOS Bias Register Field Descriptions VPOS[5:0]
>>>> Sets the Positive Display Bias (LDO) Voltage (50 mV per step)
>>>> 000000: 4 V
>>>> 000001: 4.05 V
>>>> 000010: 4.1 V
>>>> ....................
>>>> 011101: 5.45 V
>>>> 011110: 5.5 V (Default)
>>>> 011111: 5.55 V
>>>> ....................
>>>> 100111: 5.95 V
>>>> 101000: 6 V
>>>> Note: Codes 101001 to 111111 map to 6 V
>>>>
>>>> The LM3632_LDO_VSEL_MAX should be 0b101000 (0x28), so the maximum voltage
>>>> can match the datasheet.
>>>>
>>>> Fixes: 3a8d1a73a037 ("regulator: add LM363X driver")
>>>> Signed-off-by: Axel Lin <axel.lin@...ics.com>
>>>> ---
>>>>    drivers/regulator/lm363x-regulator.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/regulator/lm363x-regulator.c b/drivers/regulator/lm363x-regulator.c
>>>> index 5647e2f97ff8..e4a27d63bf90 100644
>>>> --- a/drivers/regulator/lm363x-regulator.c
>>>> +++ b/drivers/regulator/lm363x-regulator.c
>>>> @@ -30,7 +30,7 @@
>>>>
>>>>    /* LM3632 */
>>>>    #define LM3632_BOOST_VSEL_MAX               0x26
>>>> -#define LM3632_LDO_VSEL_MAX          0x29
>>>> +#define LM3632_LDO_VSEL_MAX          0x28
>>> Similar comment as I made on the LM36274
>>>
>>> These are 0 based registers so it is 28 + 1
>> The code shows:  .n_voltages     = LM3632_LDO_VSEL_MAX + 1
>> so LM3632_LDO_VSEL_MAX needs to be 0x28.
>>
>>                  .name           = "ldo_vpos",
>>                  .of_match       = "vpos",
>>                  .id             = LM3632_LDO_POS,
>>                  .ops            = &lm363x_regulator_voltage_table_ops,
>>                  .n_voltages     = LM3632_LDO_VSEL_MAX + 1,
> Hi Dan,
> I'm wondering if you read my previous reply.

Yes I just got to it I was buried with other work.  Thanks for the bump 
on the list.

I will have to try this on my board.

FYI this is not really my code Milo K was the original author.

I just added another entry to the driver.  But since Milo is MIA I will

give it a look once I finish up my LED work next week

Dan

<snip>

> Regards,
> Axel