From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20095C4338F for ; Wed, 28 Jul 2021 20:40:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E112260F46 for ; Wed, 28 Jul 2021 20:39:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231605AbhG1UkA convert rfc822-to-8bit (ORCPT ); Wed, 28 Jul 2021 16:40:00 -0400 Received: from mout.kundenserver.de ([212.227.17.10]:47485 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231411AbhG1Uj7 (ORCPT ); Wed, 28 Jul 2021 16:39:59 -0400 Received: from [192.168.1.107] ([37.4.249.97]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MHX7f-1mLoug3euP-00DWEB; Wed, 28 Jul 2021 22:39:39 +0200 Subject: Re: [PATCH 2/2] staging: vchiq: Add details to $CONFIG_VCHIQ_CDEV help text To: Ojaswin Mujoo , Greg KH Cc: nsaenz@kernel.org, dan.carpenter@oracle.com, phil@raspberrypi.com, linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org References: <9c9c128b41e31d6bebe646e052aa05c44b19eb83.1627495116.git.ojaswin98@gmail.com> <20210728200039.GA17046@ojas> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq 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X-Provags-ID: V03:K1:Y02/QiNk1rqxdEZqpvH6LPWZWQmS1z49+ItqAh9lz5CqbPuCJx6 Xx10OI8ZKB3zICBbT4nciA45GcnA3JNefNK2HF4rRclUJjsACPO5PEICyvIMDBV7bA9KFDa 8hmwnhiCCTzU1XTkqKZsex/CDi4XcOSwpClIYb6lNK69kA0jo15oeGhmy9eZsEaz27AL5bK eppL39S/B5I8AW6k9PV+g== X-UI-Out-Filterresults: notjunk:1;V03:K0:Bc3SjN1snrY=:0nfGz+iBqRXTMIG6dxogik Kvm2Sfhnrc/IdmNx94nSztQjae4gUKmx63Zvx7JFpwGf9FfbUq7b98FbAP018wL5Lm3+bggAX SaVsMZUA2NoLU+LHMNdVuV8xK+TcmuLSQxgAe9DP9lhwJTWNlSGdivIbqtyGe+GV+YMatBFaO 9F9IMGK0OuENGuo52d6yGHqdbnSgTuIOQihU4whwPuPpzgdgdypaulgyC11K2csuBDE6Cenfk 0o3woT7WTb+xlj86e1FgRTj+NHPdG5oaRcx/fYzlnh20eX9J7mnPJIxz+H2mGTwZfjCAq25OL RkFO4HZMwJ0GL/8uq1ZJHM2qAIP17nc1XVElF5DfPhl8l9FvOtmajaQoaezr1SJwKOGJNCK7O 4AspcIgLxhTimxGR500aFnQYaoL49d38vet5CmcHjgLRw4zSoxq5kyWXKu/dDuV9bWuHeatGq VWCJEMRaxkEwNGO5kcNAUX43rw1Qio5NIFCv1iU9l8KMHETExlfLwRfYs7fQMpGDBirjUQmD2 Sv9utEMrFvN4FcFOKjg0xILAvdsXaMXIpC3/EcRIW8qdF0FlNSNyLtOh10KABMoZrsRvKT5EU iD4xQwGbzehxEFbWKUSIJjgaTNn/UnWfun2gYCpcSrl0XFiELm54dqWiKyuCmU32lrdL/MOC7 80dSHas7Uft940n6sWEpWBI5ap5MMYU3Q2qjN3q/CoL9LCx2jYv429yr+lArvyi/0trabtTeJ wm2mHi8TDHpNbKr5GM5ciTR7hapdyp8m+LmR740I5JPKe11nETeAZO/gEimF9dmXi18XWacnB qeZfZRObEi5d6nJ+jHi1ltK7zWDADf+0iyzhNIWh9Or95TDe0D0qdYFr6D0ha2/82prJAs2X8 0KluiawDB4IpLGMd+W3w== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 28.07.21 um 22:00 schrieb Ojaswin Mujoo: > On Wed, Jul 28, 2021 at 08:46:51PM +0200, Greg KH wrote: >> On Thu, Jul 29, 2021 at 12:07:17AM +0530, Ojaswin Mujoo wrote: >>> Add some details to the Kconfig definition of $CONFIG_VCHIQ_CDEV to help >>> make the motive behind it a bit more clear. >>> >>> Signed-off-by: Ojaswin Mujoo >>> --- >>> drivers/staging/vc04_services/Kconfig | 8 ++++++-- >>> 1 file changed, 6 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/staging/vc04_services/Kconfig b/drivers/staging/vc04_services/Kconfig >>> index 2b70c37cdd09..cb02d8a4cb74 100644 >>> --- a/drivers/staging/vc04_services/Kconfig >>> +++ b/drivers/staging/vc04_services/Kconfig >>> @@ -25,8 +25,12 @@ config VCHIQ_CDEV >>> bool "VCHIQ Character Driver" >>> default y >>> help >>> - Enable the creation of VCHIQ character driver to help >>> - communicate with the Videocore platform. >>> + Enable the creation of VCHIQ character driver to help communicate >>> + with the VideoCore platform. The cdev exposes ioctls used by >>> + userspace libraries and testing tools to interact with VideoCore. >>> + This can be set to 'N' if the VideoCore communication is not needed >>> + by userspace but only by other kernel modules (like bcm2835-audio). >>> + If not sure, set this to 'Y'. >> I still do not understand if I need this driver or not, and I have this >> hardware! What functionality does this driver accomplish? What is >> VideoCore? > Hey Greg, > > I believe I can add this under the CONFIG_BCM2835_VCHIQ config option, > as that enables the core driver that implements the functions to > communicate with VideoCore platform? Sorry, today i'm too tired to give a good explanation. VideoCore is the VPU inside the BCM283x SoC. It runs a firmware and VCHIQ provides a way to communicate with this firmware / VPU. The VCHIQ driver is required to get access to the audio jack and camera interface (see depending drivers). Unfortunately i don't have an application list by the hand which uses the CDEV interface for VCHIQ, please use this link [1] as a starting point. [1] - https://github.com/raspberrypi/userland > > This config option merely adds a cdev which exposes the the core > driver's functionality to userspace. > > Regards, > Ojaswin >> thanks, >> >> greg k-h > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel