From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
linux@arm.linux.org.uk, pawel.moll@arm.com,
linux-mmc@vger.kernel.org, chris@printf.net, robh+dt@kernel.org,
ijc+devicetree@hellion.org.ok, galak@codeaurora.org,
Olof Johansson <olof@lixom.net>
Subject: Re: [PATCH 1/3] mmc: add support for power-on sequencing through DT
Date: Mon, 20 Jan 2014 19:58:57 +0100 [thread overview]
Message-ID: <201401201958.57997.arnd@arndb.de> (raw)
In-Reply-To: <1390190215-22700-2-git-send-email-olof@lixom.net>
On Monday 20 January 2014, Olof Johansson wrote:
>
> +Card power and reset control:
> +The following properties can be specified for cases where the MMC
> +peripheral needs additional reset, regulator and clock lines. It is for
> +example common for WiFi/BT adapters to have these separate from the main
> +MMC bus:
> + - card-reset-gpios: Specify GPIOs for card reset (reset active low)
> + - card-external-vcc-supply: Regulator to drive (independent) card VCC
> + - clock with name "card_ext_clock": External clock provided to the card
I wonder whether the reset line should use the generic reset controller binding
rather than the gpio binding. There has been a recent discussion about a
gpio-reset driver, which should generalize this at the reset level, and
it would make it possible to use reset controllers that are not gpio driven.
In general, any gpio can be used as a reset, but not every reset line can
be a gpio. I don't know whether anyone would use an internal reset-controller
for an external SDIO chip though, so maybe your approach is sufficient.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/3] mmc: add support for power-on sequencing through DT
Date: Mon, 20 Jan 2014 19:58:57 +0100 [thread overview]
Message-ID: <201401201958.57997.arnd@arndb.de> (raw)
In-Reply-To: <1390190215-22700-2-git-send-email-olof@lixom.net>
On Monday 20 January 2014, Olof Johansson wrote:
>
> +Card power and reset control:
> +The following properties can be specified for cases where the MMC
> +peripheral needs additional reset, regulator and clock lines. It is for
> +example common for WiFi/BT adapters to have these separate from the main
> +MMC bus:
> + - card-reset-gpios: Specify GPIOs for card reset (reset active low)
> + - card-external-vcc-supply: Regulator to drive (independent) card VCC
> + - clock with name "card_ext_clock": External clock provided to the card
I wonder whether the reset line should use the generic reset controller binding
rather than the gpio binding. There has been a recent discussion about a
gpio-reset driver, which should generalize this at the reset level, and
it would make it possible to use reset controllers that are not gpio driven.
In general, any gpio can be used as a reset, but not every reset line can
be a gpio. I don't know whether anyone would use an internal reset-controller
for an external SDIO chip though, so maybe your approach is sufficient.
Arnd
next prev parent reply other threads:[~2014-01-20 18:58 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-20 3:56 [PATCH 0/3] RFC/RFT: Powering on MMC Wifi/BT modules in MMC core Olof Johansson
2014-01-20 3:56 ` Olof Johansson
2014-01-20 3:56 ` [PATCH 1/3] mmc: add support for power-on sequencing through DT Olof Johansson
2014-01-20 3:56 ` Olof Johansson
2014-01-20 8:44 ` Ulf Hansson
2014-01-20 8:44 ` Ulf Hansson
2014-01-20 19:13 ` Olof Johansson
2014-01-20 19:13 ` Olof Johansson
2014-01-21 8:55 ` Ulf Hansson
2014-01-21 8:55 ` Ulf Hansson
2014-01-21 18:14 ` Olof Johansson
2014-01-21 18:14 ` Olof Johansson
2014-01-22 11:30 ` Mark Brown
2014-01-22 11:30 ` Mark Brown
2014-01-20 16:36 ` Mark Brown
2014-01-20 16:36 ` Mark Brown
2014-01-20 16:48 ` Russell King - ARM Linux
2014-01-20 16:48 ` Russell King - ARM Linux
2014-01-20 17:03 ` Fabio Estevam
2014-01-20 17:03 ` Fabio Estevam
2014-01-20 17:16 ` Russell King - ARM Linux
2014-01-20 17:16 ` Russell King - ARM Linux
2014-01-20 18:47 ` Fabio Estevam
2014-01-20 18:47 ` Fabio Estevam
2014-01-21 19:19 ` Russell King - ARM Linux
2014-01-21 19:19 ` Russell King - ARM Linux
2014-01-24 17:35 ` Fabio Estevam
2014-01-24 17:35 ` Fabio Estevam
2014-01-27 8:43 ` Jyri Sarha
2014-01-27 8:43 ` Jyri Sarha
2014-01-27 8:54 ` Chen-Yu Tsai
2014-01-27 8:54 ` Chen-Yu Tsai
2014-01-27 9:48 ` Jyri Sarha
2014-01-27 9:48 ` Jyri Sarha
2014-01-20 18:58 ` Arnd Bergmann [this message]
2014-01-20 18:58 ` Arnd Bergmann
[not found] ` <201401201958.57997.arnd-r2nGTMty4D4@public.gmane.org>
2014-01-20 19:04 ` Olof Johansson
2014-01-20 19:04 ` Olof Johansson
2014-01-20 19:12 ` Arnd Bergmann
2014-01-20 19:12 ` Arnd Bergmann
2014-01-20 19:14 ` Fabio Estevam
2014-01-20 19:14 ` Fabio Estevam
2014-01-20 19:14 ` Olof Johansson
2014-01-20 19:14 ` Olof Johansson
2014-01-21 7:24 ` Sascha Hauer
2014-01-21 7:24 ` Sascha Hauer
2014-01-21 7:25 ` Sascha Hauer
2014-01-21 7:25 ` Sascha Hauer
2014-01-21 18:34 ` Tomasz Figa
2014-01-21 18:34 ` Tomasz Figa
2014-01-21 21:30 ` Olof Johansson
2014-01-21 21:30 ` Olof Johansson
2014-01-21 21:39 ` Tomasz Figa
2014-01-21 21:39 ` Tomasz Figa
2014-01-26 17:26 ` Tomasz Figa
2014-01-26 17:26 ` Tomasz Figa
2014-01-27 10:19 ` Ulf Hansson
2014-01-27 10:19 ` Ulf Hansson
2014-01-28 0:59 ` Tomasz Figa
2014-01-28 0:59 ` Tomasz Figa
2014-01-28 1:08 ` Chris Ball
2014-01-28 1:08 ` Chris Ball
2014-01-28 10:06 ` Ulf Hansson
2014-01-28 10:06 ` Ulf Hansson
2014-01-28 10:48 ` Arnd Bergmann
2014-01-28 10:48 ` Arnd Bergmann
2014-02-12 18:33 ` Mark Brown
2014-02-12 18:33 ` Mark Brown
2014-02-13 8:56 ` Ulf Hansson
2014-02-13 8:56 ` Ulf Hansson
2014-02-13 9:01 ` Tomasz Figa
2014-02-13 9:01 ` Tomasz Figa
2014-02-13 10:42 ` Russell King - ARM Linux
2014-02-13 10:42 ` Russell King - ARM Linux
2014-02-13 12:48 ` Arnd Bergmann
2014-02-13 12:48 ` Arnd Bergmann
2014-02-13 14:41 ` Russell King - ARM Linux
2014-02-13 14:41 ` Russell King - ARM Linux
2014-02-13 16:13 ` Arnd Bergmann
2014-02-13 16:13 ` Arnd Bergmann
2014-02-13 17:31 ` Olof Johansson
2014-02-13 17:31 ` Olof Johansson
2014-02-15 12:18 ` Arnd Bergmann
2014-02-15 12:18 ` Arnd Bergmann
2014-02-15 12:27 ` Russell King - ARM Linux
2014-02-15 12:27 ` Russell King - ARM Linux
2014-02-15 13:09 ` Arnd Bergmann
2014-02-15 13:09 ` Arnd Bergmann
2014-02-15 13:22 ` Tomasz Figa
2014-02-15 13:22 ` Tomasz Figa
2014-02-15 16:21 ` Arnd Bergmann
2014-02-15 16:21 ` Arnd Bergmann
2014-02-15 20:52 ` Russell King - ARM Linux
2014-02-15 20:52 ` Russell King - ARM Linux
2014-02-15 21:35 ` Tomasz Figa
2014-02-15 21:35 ` Tomasz Figa
2014-02-15 22:03 ` Russell King - ARM Linux
2014-02-15 22:03 ` Russell King - ARM Linux
2014-02-17 13:00 ` Arnd Bergmann
2014-02-17 13:00 ` Arnd Bergmann
2014-02-17 23:25 ` Mark Brown
2014-02-17 23:25 ` Mark Brown
2014-01-20 3:56 ` [PATCH 2/3] mmc: dw_mmc: call mmc_of_parse to fill in common options Olof Johansson
2014-01-20 3:56 ` Olof Johansson
2014-01-20 4:53 ` Jaehoon Chung
2014-01-20 4:53 ` Jaehoon Chung
2014-01-20 3:56 ` [PATCH 3/3] ARM: dts: exynos5250-snow: Enable wifi power-on Olof Johansson
2014-01-20 3:56 ` Olof Johansson
2014-01-30 21:49 ` [PATCH 0/3] RFC/RFT: Powering on MMC Wifi/BT modules in MMC core Russell King - ARM Linux
2014-01-30 21:49 ` Russell King - ARM Linux
2014-02-01 16:14 ` Russell King - ARM Linux
2014-02-01 16:14 ` Russell King - ARM Linux
2014-02-13 10:36 ` Russell King - ARM Linux
2014-02-13 10:36 ` Russell King - ARM Linux
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