From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Wolfram Sang <w.sang@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 2/7] imx/gpio: make gpio_get_value actually work
Date: Mon, 19 Apr 2010 10:54:27 +0200 [thread overview]
Message-ID: <20100419085427.GB32752@pengutronix.de> (raw)
In-Reply-To: <1271665698-23163-3-git-send-email-w.sang@pengutronix.de>
Hello,
On Mon, Apr 19, 2010 at 10:28:13AM +0200, Wolfram Sang wrote:
> From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
>
> Newer i.MX-variants can route the content of the Sample Status Register to the
> Data Register, but older ones can't. So, use the Sample Register to be generic.
> As a drawback, the ability to read back the values of output GPIOs is lost.
AFAIK the last sentence (that was authored by Wolfram, though the patch
is mine) is wrong. I checked mx27 and mx35 specs and both the overview
and the actual description suggest that reading output values works
(using PSR aka SSR) when the iomuxer is configured for GPIO.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2010-04-19 8:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-19 8:28 Patch series derived from latest project Wolfram Sang
[not found] ` <1271665698-23163-7-git-send-email-w.sang@pengutronix.de>
2010-04-19 8:38 ` [PATCH 6/7] wip: fix possible error on overflow in is_timeout Uwe Kleine-König
[not found] ` <1271734752-8377-1-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:32 ` [PATCH 6/7] clock: " Sascha Hauer
[not found] ` <1271665698-23163-3-git-send-email-w.sang@pengutronix.de>
2010-04-19 8:54 ` Uwe Kleine-König [this message]
2010-04-22 11:16 ` [PATCH 2/7] imx/gpio: make gpio_get_value actually work Sascha Hauer
[not found] ` <1272003760-15646-1-git-send-email-w.sang@pengutronix.de>
2010-04-23 7:49 ` Sascha Hauer
[not found] ` <1271665698-23163-2-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:10 ` [PATCH 1/7] give nice output when generating barebox.bin and barebox.S Sascha Hauer
2010-04-23 6:19 ` Wolfram Sang
2010-04-23 8:17 ` Uwe Kleine-König
[not found] ` <1271665698-23163-4-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:31 ` [PATCH 3/7] arm: update mach-types Sascha Hauer
[not found] ` <1271665698-23163-5-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:31 ` [PATCH 4/7] cfi_flash: use flash_write_word instead of reimplementing it again Sascha Hauer
[not found] ` <1271665698-23163-6-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:31 ` [PATCH 5/7] board/pcm038: document value written to ESDCFG0 Sascha Hauer
[not found] ` <1271665698-23163-8-git-send-email-w.sang@pengutronix.de>
2010-04-22 11:34 ` [PATCH 7/7] nor: Don't use the sector for the unlock sequence Sascha Hauer
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