linux-kernel - Re: [RFC v1 4/6] platform: x86: Add generic Intel IPC driver

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Date:   Mon, 21 Aug 2017 22:09:43 -0700
From:   sathya <sathyaosid@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     "x86@...nel.org" <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Zha Qipeng <qipeng.zha@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andy@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [RFC v1 4/6] platform: x86: Add generic Intel IPC driver

Hi Andy,


On 08/18/2017 05:38 AM, Andy Shevchenko wrote:
> On Tue, Aug 1, 2017 at 9:13 PM,
> <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> Currently intel_scu_ipc.c, intel_pmc_ipc.c and intel_punit_ipc.c
>> redundantly implements the same IPC features and has lot of code
>> duplication between them. This driver addresses this issue by grouping
>> the common IPC functionalities under the same driver.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>> ---
>>   arch/x86/include/asm/intel_ipc_dev.h | 148 ++++++++++++
> No, it should go under include/linux/platform_data/x86/
>
>> +/*
>> + * intel_ipc_dev.h: IPC class device header file
> No file names in the top of files.
>
>> + *
>> + * (C) Copyright 2017 Intel Corporation
>> + *
>> + * 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; version 2
>> + * of the License.
>> + *
>> + */
>> +struct intel_ipc_dev_cfg {
>> +       void __iomem *base;
>> +       void __iomem *wrbuf_reg;
>> +       void __iomem *rbuf_reg;
>> +       void __iomem *sptr_reg;
>> +       void __iomem *dptr_reg;
>> +       void __iomem *status_reg;
>> +       void __iomem *cmd_reg;
> No, you have to switch to regmap instead.
Do you want me to register regmap in intel_pmc_ipc.c and pass this 
regmap pointer to devm_intel_ipc_dev_create()
instead of regular mem address ? Please correct me if my understanding 
is incorrect.

But I don't understand how this change will improve the design.
>
>> +       int mode;
>> +       int irq;
>> +       int irqflags;
>> +       int chan_type;
>> +       bool use_msi;
>> +};
>
-
Sathya