linux-kernel - Re: [PATCH v2] drivers/mailbox: Add Aspeed mailbox driver

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Date:   Wed, 03 May 2017 18:02:12 +1000
From:   Suraj Jitindar Singh <sjitindarsingh@...il.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
Cc:     Joel Stanley <joel@....id.au>, Cyril Bur <cyrilbur@...il.com>,
        linux-kernel@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2] drivers/mailbox: Add Aspeed mailbox driver

***PING***

Are there any comments on this stopping it going upstream?

Do we think this would better belong in /drivers/misc rather than as a
mailbox driver?

Looking to get some discussion going and this moving along :)

Suraj

On Thu, 2017-02-09 at 15:09 +1030, Joel Stanley wrote:
> On Wed, Feb 8, 2017 at 10:06 AM, Cyril Bur <cyrilbur@...il.com>
> wrote:
> > 
> > This provides access to the mbox registers on the ast2400 and
> > ast2500
> > SoCs.
> > 
> > This driver allows arbitrary reads and writes to the 16 data
> > registers as
> > the other end may have configured the mbox hardware to provide an
> > interrupt when a specific register gets written to.
> > 
> > Signed-off-by: Cyril Bur <cyrilbur@...il.com>
> > ---
> > V2:
> >    s/ASpeed/Aspeed/
> >    Reword Kconfig options
> >    Use tristate for config symbol
> > 
> >  drivers/mailbox/Kconfig       |   8 +
> >  drivers/mailbox/Makefile      |   2 +
> >  drivers/mailbox/aspeed-mbox.c | 334
> > ++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 344 insertions(+)
> >  create mode 100644 drivers/mailbox/aspeed-mbox.c
> > 
> > diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
> > index ceff415f201c..e24044d5c219 100644
> > --- a/drivers/mailbox/Kconfig
> > +++ b/drivers/mailbox/Kconfig
> > @@ -152,4 +152,12 @@ config BCM_PDC_MBOX
> >           Mailbox implementation for the Broadcom PDC ring manager,
> >           which provides access to various offload engines on
> > Broadcom
> >           SoCs. Say Y here if you want to use the Broadcom PDC.
> > +
> > +config ASPEED_LPC_MBOX
> > +       depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP &&
> > MFD_SYSCON
> > +       tristate "Aspeed LPC Mailbox Controller"
> > +       ---help---
> > +         Provides a driver for the MBOX registers found on Aspeed
> > SOCs
> > +         (AST2400 and AST2500). This driver provides a device for
> > aspeed
> > +         mbox registers
> You repeat yourself.
> 
> Mention that this driver is for the the BMC side.
> 
> > 
> > diff --git a/drivers/mailbox/aspeed-mbox.c
> > b/drivers/mailbox/aspeed-mbox.c
> > 
> > +static int aspeed_mbox_probe(struct platform_device *pdev)
> > +{
> > +       struct aspeed_mbox *mbox;
> > +       struct device *dev;
> > +       int rc;
> > +
> > +       dev = &pdev->dev;
> > +
> > +       mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
> > +       if (!mbox)
> > +               return -ENOMEM;
> > +
> > +       dev_set_drvdata(&pdev->dev, mbox);
> > +
> > +       rc = of_property_read_u32(dev->of_node, "reg", &mbox-
> > >base);
> > +       if (rc) {
> > +               dev_err(dev, "Couldn't read reg device-tree
> > property\n");
> > +               return rc;
> > +       }
> I think we want to use of_address_to_resource here.
> 
> > 
> > +
> > +static const struct of_device_id aspeed_mbox_match[] = {
> > +       { .compatible = "aspeed,ast2400-mbox" },
> > +       { .compatible = "aspeed,ast2500-mbox" },
> > +       { },
> I didn't see the bindings in this series. Have they already been
> accepted?
> 
> Cheers,
> 
> Joel