linux-kernel - regulator: Question about the buck_volt_range and MT6311_MAX

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Date:	Thu, 30 Jul 2015 21:10:41 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Henry Chen <henryc.chen@...iatek.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org
Subject: regulator: Question about the buck_volt_range and MT6311_MAX_UV
 setting

Hi Henry,
Seems something wrong in either buck_volt_range or MT6311_MAX_UV setting.

.n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1
(1400000 - 600000) / 6250 + 1 = 129
So .n_voltages = 129.

>From the buck_volt_range:
The linear range has min_sel: 0, max_sel: 0x7f
(0 ~ 127, so 128 selector in this range)
And the max voltage is
600000 + 0x7f * 6250 = 1393750

I don't have the datasheet, so can you double check this?
Thank,
Axel


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