From: joravec@drewtech•com (Joey Oravec)
To: linux-arm-kernel@lists•infradead.org
Subject: plat-orion multi purpose pins problem for mv78200
Date: Fri, 01 Jul 2011 15:14:48 -0400 [thread overview]
Message-ID: <4E0E1CA8.7090200@drewtech.com> (raw)
Nicola, Lennert -
There's a problem in 3.0-rc5 when calling mv78xx0_mpp_conf() on the
MV78200 processor. This processor has 49 multi purpose pins but only 31
GPIOs. MPP[31:0] map directly to GPIO[31:0] but the next 17 are a little
more complex:
MPP[39:32] = GPIO[7:0]
MPP[46:40] = GPIO[23:17]
MPP[47] = GPIO[16]
MPP[48] = GPIO[8]
MPP[49] = GPIO[9]
See arch/arm/plat-orion/mpp.c. Inside orion_mpp_conf() the array gets
processed by calling MPP_NUM() then calling orion_gpio_set_valid(). As
demonstrated above, the MPP number and GPIO number are not
interchangeable and on the MV78200 that's a problem when trying to setup
any MPP > 31.
So we need to map each MPP to a given GPIO -- I don't know how the
mapping will differ across processors. We also need to keep-clear which
functions are called with an MPP number and which functions are called
with a GPIO number.
Followup question -- Marvell has several SoC families, but Linux uess
plat-orion for everything. For example MV78200 isn't an Orion it's a
Discovery Innovation series. Would it make more sense to have separate
plat-* code for the separate families?
-joey
next reply other threads:[~2011-07-01 19:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 19:14 Joey Oravec [this message]
2011-07-01 21:56 ` plat-orion multi purpose pins problem for mv78200 Joey Oravec
2011-07-02 12:23 ` Simon Guinot
2011-07-03 12:46 ` saeed bishara
2011-07-04 14:33 ` [PATCH v2] genirq: replace irq_gc_ack() with {set,clr}_bit variants Simon Guinot
2011-07-04 14:48 ` [PATCH v2] genirq: replace irq_gc_ack() with {set, clr}_bit variants Nicolas Pitre
2011-07-16 3:39 ` Kukjin Kim
2011-07-06 15:31 ` [PATCH v2] genirq: replace irq_gc_ack() with {set,clr}_bit variants Simon Guinot
2011-07-05 15:37 ` plat-orion multi purpose pins problem for mv78200 Joey Oravec
2011-07-06 16:18 ` Simon Guinot
2011-07-06 16:32 ` saeed bishara
2011-07-06 18:49 ` Joey Oravec
2011-07-07 6:40 ` saeed bishara
2011-07-07 13:49 ` Joey Oravec
2011-07-10 13:21 ` saeed bishara
2011-07-12 13:36 ` Joey Oravec
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