linux-kernel - Re: [PATCH V3 2/2] i2c-designware: Add Intel Baytrail PMIC I2C bus support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 3 Dec 2014 18:10:46 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"David E. Box" <david.e.box@...ux.intel.com>
Cc:	wsa@...-dreams.de, jdelvare@...e.de, arnd@...db.de,
	maxime.ripard@...e-electrons.com, dianders@...omium.org,
	u.kleine-koenig@...gutronix.de,
	laurent.pinchart+renesas@...asonboard.com,
	boris.brezillon@...e-electrons.com, andrew@...n.ch,
	sjg@...omium.org, markus.mayer@...aro.org,
	jacob.jun.pan@...ux.intel.com, max.schwarz@...ine.de,
	skuribay@...ox.com, Romain.Baeriswyl@...lis.com,
	wenkai.du@...el.com, chiau.ee.chew@...el.com, alan@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH V3 2/2] i2c-designware: Add Intel Baytrail PMIC I2C bus
 support

On Mon, Dec 01, 2014 at 04:09:33PM -0800, David E. Box wrote:
> This patch implements an I2C bus sharing mechanism between the host and platform
> hardware on select Intel BayTrail SoC platforms using the X-Powers AXP288 PMIC.
> 
> On these platforms access to the PMIC must be shared with platform hardware. The
> hardware unit assumes full control of the I2C bus and the host must request
> access through a special semaphore. Hardware control of the bus also makes it
> necessary to disable runtime pm to avoid interfering with hardware transactions.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
>  drivers/i2c/busses/Kconfig                   |  12 +++
>  drivers/i2c/busses/Makefile                  |   1 +
>  drivers/i2c/busses/i2c-designware-baytrail.c | 155 +++++++++++++++++++++++++++
>  drivers/i2c/busses/i2c-designware-core.h     |   6 ++
>  4 files changed, 174 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-designware-baytrail.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 917c358..d2bfd88 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -464,6 +464,18 @@ config I2C_DESIGNWARE_PCI
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called i2c-designware-pci.
>  
> +config I2C_DESIGNWARE_BAYTRAIL
> +	bool "Intel Baytrail I2C semaphore support"
> +	depends on I2C_DESIGNWARE_PLATFORM=y

Hmm, is there something preventing to compile this as module?

What comes to the driver itself, no objections from me.

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/