linux-kernel - Re: [alsa-devel] [PATCH v7 03/13] slimbus: Add SLIMbus bus type

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Message-ID: <20171116161426.GA3187@localhost>
Date:   Thu, 16 Nov 2017 21:44:26 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, mark.rutland@....com,
        michael.opdenacker@...e-electrons.com, poeschel@...onage.de,
        andreas.noever@...il.com, arnd@...db.de, bp@...e.de,
        devicetree@...r.kernel.org, james.hogan@...tec.com,
        pawel.moll@....com, linux-arm-msm@...r.kernel.org,
        sharon.dvir1@...l.huji.ac.il, robh+dt@...nel.org,
        sdharia@...eaurora.org, alan@...ux.intel.com, treding@...dia.com,
        mathieu.poirier@...aro.org, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, daniel@...ll.ch, joe@...ches.com,
        davem@...emloft.net
Subject: Re: [alsa-devel] [PATCH v7 03/13] slimbus: Add SLIMbus bus type

On Thu, Nov 16, 2017 at 01:40:05PM +0000, Srinivas Kandagatla wrote:
> On 16/11/17 13:18, Vinod Koul wrote:
> >On Wed, Nov 15, 2017 at 02:10:33PM +0000, srinivas.kandagatla@...aro.org wrote:
> >
> >>+menuconfig SLIMBUS
> >>+	tristate "Slimbus support"
> >>+	help
> >>+	  Slimbus is standard interface between System-on-Chip and audio codec,
> >>+	  and other peripheral components in typical embedded systems.
> >>+
> >>+	  If unsure, choose N.
> >>+
> >>+if SLIMBUS
> >>+
> >>+# SlIMbus controllers
> >
> >Slimbus perhaps?
> >
> slimbus is specified as "SLIMbus" in the mipi specs, so I should probably
> stay with it and make it consistent across the patchset.

Yeah this I though was a first use, so I though this was a typo. I think
Documentation should use the spec term (like SoundWire) and code should pick
anyone and just be consistent on it.

> >>+static int slim_device_match(struct device *dev, struct device_driver *drv)
> >>+{
> >>+	struct slim_device *sbdev = to_slim_device(dev);
> >>+	struct slim_driver *sbdrv = to_slim_driver(drv);
> >>+
> >>+	return slim_match(sbdrv->id_table, sbdev) != NULL;
> >
> >return !!slim_match() ?

I guess you missed this one..

> >>+struct slim_device_id {
> >>+	__u16 manf_id, prod_code;
> >>+	__u8 dev_index, instance;
> >>+
> >>+	/* Data private to the driver */
> >>+	kernel_ulong_t driver_data;
> >
> >As Takashi pointed out in SDW patches, this needs to be aligned.
> >
> Okay, I will make sure that driver_data is aligned.

You may want to look at comments and disucssion on the SoundWire patches

-- 
~Vinod