From: Heiko Stuebner <heiko@sntech.de>
To: Javier Martinez Canillas <javier@osg.samsung.com>
Cc: Caesar Wang <wxt@rock-chips.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
linux-rockchip@lists.infradead.org, leecam@google.com,
leozwang@google.com, keescook@google.com,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Alexandre Courbot <acourbot@nvidia.com>,
NeilBrown <neil@brown.name>
Subject: Re: [PATCH v2 06/12] mmc: pwrseq: add support for power-on sequencing through DT
Date: Sat, 09 Jan 2016 03:42:03 +0100 [thread overview]
Message-ID: <6960259.dpUH8KWsNS@phil> (raw)
In-Reply-To: <568FAA07.1010509@osg.samsung.com>
Am Freitag, 8. Januar 2016, 09:22:31 schrieb Javier Martinez Canillas:
> > For example:
> > we need enable wifi module power to via the WL_REG_ON
> > pin, we need enable it as the regulator if this pin is connected to
> > the gpio of cpu.
>
> This part confuses me, so does your chip have an actual regulator that
> needs to be enabled or is just a fake regulator whose gpio property is
> used not to enable the regulator but to toggle the WL_REG_ON pin of
> the WiFi chip?
another option would be to use the reset-gpio-handles. rk3288-veyron and I
think some Exynos as well use it that way.
> > Maybe, someone will say that can pull up/down from dts.
> > Unfortunately some SoCs can't support pinctrl pull up/down in
> > internal.
>
> Can you please elaborate on this? AFAIU this limitation is the reason
> why you went with the regulator approach so I think it deserve a more
> deep explanation.
On the rk3036 each pin has an individual unchangable pull direction. So it's
either no bias or pulling in the predefined direction (the pin_default bias
option).
Heiko
next prev parent reply other threads:[~2016-01-09 2:42 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-07 8:25 [PATCH v2 00/12] Add the family patches to support for kylin board Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 01/12] ARM: dts: rockchip: set the pinctrl default setting for rk3036 i2s Caesar Wang
2016-01-07 8:25 ` Caesar Wang
[not found] ` <1452155155-16232-2-git-send-email-wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-01-09 2:17 ` Heiko Stuebner
2016-01-09 2:17 ` Heiko Stuebner
2016-01-09 2:17 ` Heiko Stuebner
[not found] ` <1452155155-16232-1-git-send-email-wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-01-07 8:25 ` [PATCH v2 02/12] ARM: dts: rockchip: add the sound codec for kylin board Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` Caesar Wang
[not found] ` <1452155155-16232-3-git-send-email-wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-01-09 2:39 ` Heiko Stuebner
2016-01-09 2:39 ` Heiko Stuebner
2016-01-09 2:39 ` Heiko Stuebner
2016-01-07 8:25 ` [PATCH v2 03/12] ARM: dts: rockchip: override the clocks in i2s " Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-09 2:31 ` Heiko Stuebner
2016-01-09 2:31 ` Heiko Stuebner
2016-01-11 13:38 ` Caesar Wang
2016-01-11 13:38 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 12/12] ARM: dts: Add pl330-broken-no-flushp quirk for rk3036 SoCs Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 04/12] clk: rockchip: rk3036: enable the CLK_IGNORE_UNUSED flag for sclk_i2s_out Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 10:05 ` Heiko Stuebner
2016-01-07 10:05 ` Heiko Stuebner
2016-01-08 9:26 ` Caesar Wang
2016-01-08 9:26 ` Caesar Wang
2016-01-08 9:46 ` Heiko Stuebner
2016-01-08 9:46 ` Heiko Stuebner
2016-01-08 9:46 ` Heiko Stuebner
2016-01-13 8:10 ` Caesar Wang
2016-01-13 8:10 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 05/12] mmc: pwrseq: Document optional exteral vcc for the simple power sequence Caesar Wang
[not found] ` <1452155155-16232-6-git-send-email-wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2016-01-08 12:13 ` Javier Martinez Canillas
2016-01-08 12:13 ` Javier Martinez Canillas
2016-01-07 8:25 ` [PATCH v2 06/12] mmc: pwrseq: add support for power-on sequencing through DT Caesar Wang
2016-01-08 12:22 ` Javier Martinez Canillas
2016-01-09 2:42 ` Heiko Stuebner [this message]
2016-01-11 16:02 ` Javier Martinez Canillas
[not found] ` <5693D226.2000307-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2016-01-15 9:15 ` Caesar Wang
2016-01-15 9:15 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 07/12] ARM: dts: rockchip: enable the high speed on sdio for kylin board Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 08/12] ARM: dts: rockchip: add the wifi/bt regulator " Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 09/12] ARM: dts: rockchip: enable the uart0 " Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 10/12] ARM: dts: rockchip: add the sdmmc " Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 8:25 ` [PATCH v2 11/12] ARM: dts: rockchip: add the lcdc and hdmi node for rk3036 Caesar Wang
2016-01-07 8:25 ` Caesar Wang
2016-01-07 10:44 ` [PATCH v2 00/12] Add the family patches to support for kylin board Heiko Stuebner
2016-01-07 10:44 ` Heiko Stuebner
2016-01-08 9:02 ` Caesar Wang
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