From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laxman Dewangan Subject: Re: [PATCH 6/6] i2c: tegra: Add pinctrl support Date: Thu, 11 Aug 2016 20:31:40 +0530 Message-ID: <57AC9354.1080603@nvidia.com> References: <1470910620-9898-1-git-send-email-jonathanh@nvidia.com> <1470910620-9898-7-git-send-email-jonathanh@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1470910620-9898-7-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jon Hunter , Wolfram Sang , Stephen Warren , Thierry Reding , Alexandre Courbot Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-i2c@vger.kernel.org On Thursday 11 August 2016 03:47 PM, Jon Hunter wrote: > On Tegra124/132 the pins for I2C6 are shared with the Display Port AUX > (DPAUX) channel and on Tegra210 the pins for I2C4 and I2C6 are shared > with DPAUX1 and DPAUX0, respectively. The multiplexing of the pins is > handled by a register in the DPAUX and so the Tegra DPAUX driver has > been updated to register a pinctrl device for managing these pins. > > The pins for these particular I2C devices are bound to the I2C device > prior to probing. However, these I2C devices are in a different power > partition to the DPAUX devices that own the pins. Hence, it is desirable > to place the pins in the 'idle' state and allow the DPAUX power > partition to switch off, when these I2C devices is not in use. > Therefore, add calls to place the I2C pins in the 'default' and 'idle' > states when the I2C device is runtime resumed and suspended, > respectively. > > Please note that the pinctrl functions that set the state of the pins > check to see if the devices has pins associated and will return zero > if they do not. Therefore, it is safe to call these pinctrl functions > even for I2C devices that do not have any pins associated. > > Signed-off-by: Jon Hunter > Acked-by: Laxman Dewangan