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

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Date:   Thu, 9 Feb 2017 15:09:01 +1030
From:   Joel Stanley <joel@....id.au>
To:     Cyril Bur <cyrilbur@...il.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Neuling <mikey@...ling.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2] drivers/mailbox: Add Aspeed mailbox driver

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