linux-kernel - Re: [PATCH v2 2/3] drivers: char: ipmi: Add Aspeed SSIF BMC driver

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Message-ID: <20210402120137.GA26002@pengutronix.de>
Date:   Fri, 2 Apr 2021 14:01:37 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Quan Nguyen <quan@...amperecomputing.com>
Cc:     Corey Minyard <minyard@....org>, Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Wolfram Sang <wsa@...nel.org>,
        openipmi-developer@...ts.sourceforge.net,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v2 2/3] drivers: char: ipmi: Add Aspeed SSIF BMC driver

Hi Quan,

On Tue, Mar 30, 2021 at 09:10:28PM +0700, Quan Nguyen wrote:
> The SMBus system interface (SSIF) IPMI BMC driver can be used to perform
> in-band IPMI communication with their host in management (BMC) side.
> 
> This commits adds support specifically for Aspeed AST2500 which commonly
> used as Board Management Controllers.
> 
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> ---
[...]
> diff --git a/drivers/char/ipmi/ssif_bmc_aspeed.c b/drivers/char/ipmi/ssif_bmc_aspeed.c
> new file mode 100644
> index 000000000000..a563fcff5acc
> --- /dev/null
> +++ b/drivers/char/ipmi/ssif_bmc_aspeed.c
> @@ -0,0 +1,132 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * The driver for BMC side of Aspeed SSIF interface
> + *
> + * Copyright (c) 2021, Ampere Computing LLC
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <https://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/poll.h>
> +#include <linux/iopoll.h>
> +
> +#include "ssif_bmc.h"
> +
> +struct aspeed_i2c_bus {
> +	struct i2c_adapter              adap;
> +	struct device                   *dev;

This device handle is apparently unused.

> +	void __iomem                    *base;
> +	struct reset_control            *rst;

This reset control handle is unused as well.

> +	/* Synchronizes I/O mem access to base. */
> +	spinlock_t                      lock;
> +};

regards
Philipp