[PATCH v4 11/26] ARM: pxa: magician: Optimize EGPIO initial values

Philipp Zabel [off-list ref] writes:

Am Montag, den 28.09.2015, 23:32 +0200 schrieb Petr Cvek:

quoted

This patch optimizes initial values of the EGPIO chip driver.

GSM and sound should be powered off during boot. A weak accumulator
and
a powered GSM sometimes cause a system reboot. A charging current
should be
as high as possible during boot.

Wouldn't that violate USB spec if we boot the magician while plugged
into an unpowered USB host?

You're right. As USB 2.0 device cannot draw more than 100mA until enumerated
(prior to battery charging spec 1.1). It is described in USB 2.0 specification,
chapter 7.3.2, in the table :
 - Unconfigured Function/Hub - ICCInit - maximum 100mA.

So I'll drop this patch for now I think.

Cheers.

-- 
Robert