linux-kernel - Re: [PATCH 2/3] mailbox: Add Broadcom PDC mailbox driver

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Date:	Tue, 28 Jun 2016 20:51:29 +0530
From:	Jassi Brar <jassisinghbrar@...il.com>
To:	Rob Rice <rob.rice@...adcom.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Anup Patel <anup.patel@...adcom.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Rob Rice <rrice@...adcom.com>
Subject: Re: [PATCH 2/3] mailbox: Add Broadcom PDC mailbox driver

On Tue, Jun 28, 2016 at 7:06 PM, Rob Rice <rob.rice@...adcom.com> wrote:

>>>  drivers/mailbox/Kconfig                 |    9 +
>>>  drivers/mailbox/Makefile                |    2 +
>>>  drivers/mailbox/mailbox-pdc/Makefile    |    8 +
>>>  drivers/mailbox/mailbox-pdc/pdc.c       | 1181 +++++++++++++++++++++++++++++++
>>>  drivers/mailbox/mailbox-pdc/pdc.h       |  303 ++++++++
>>>  drivers/mailbox/mailbox-pdc/pdc_debug.c |  101 +++
>>>  drivers/mailbox/mailbox-pdc/pdc_debug.h |   24 +
>>>
>> We already have mailbox api testing rig - mailbox-test, still if you
>> really need debugfs exposure please merge it in pdc.c especially when
>> pdc_debug.c is only 80lines and it always compiled and currently has
>> to export functions globally. Maybe fold everything in a single like
>> other platforms?
>
> [WRR] I'm using debugfs to display stats, not so much for testing the
> module. So I don't think mailbox-test is a substitute. But if you
> prefer, I'll move the stats code into pdc.c, along with the code from
> pdc.h and move pdc.c from the mailbox-pdc directory up to
> drivers/mailbox.
>
Yes, please merge them.

>>> +/**
>>> + * pdc_hw_init() - Use the given initialization parameters to initialize the
>>> + * state for one of the PDCs.
>>> + * @dev:   device structure for PDC
>>> + * @pdcs:  state of the PDC
>>> + * @parms: parameter values to set
>>> + */
>>> +static
>>> +void pdc_hw_init(struct device *dev, struct pdc_state *pdcs,
>>> +                struct hw_init_parms *parms)
>>>
>> You could do without the dev and parms.
>
> [WRR] Yes, I can get dev from pdcs. but parms is a stack variable in
> the calling function and has to be passed, as I see it.
>
hw_init_parms is invented only to be passed to pdc_hw_init from probe.
.ring_entries is PDC_RING_ENTRIES
.hw_pbase is unused
.hw_vbase is pdcs->pdc_reg_vbase

thanks.