linux-kernel - Re: [PATCH v1 4/4] usb: host: add xhci-exynos module

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Message-ID: <ee5ad930-7b48-5b7c-f810-76fe497595f3@kernel.org>
Date:   Mon, 7 Mar 2022 11:59:23 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jung Daehwan <dh10.jung@...sung.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>,
        "chihhao . chen" <chihhao.chen@...iatek.com>, sc.suh@...sung.com,
        cpgs@...sung.com, cpgsproxy5@...sung.com
Subject: Re: [PATCH v1 4/4] usb: host: add xhci-exynos module

On 07/03/2022 11:26, Jung Daehwan wrote:
> On Mon, Mar 07, 2022 at 11:07:04AM +0100, Krzysztof Kozlowski wrote:
>> On 04/03/2022 07:23, Daehwan Jung wrote:
>>> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
>>
>> +Cc Randy,
>> I guess here is the rest of the patches.
>>
>>> ---
>>>  drivers/usb/host/xhci-exynos.c | 2025 ++++++++++++++++++++++++++++++++
>>>  drivers/usb/host/xhci-exynos.h |  150 +++
>>>  2 files changed, 2175 insertions(+)
>>>  create mode 100644 drivers/usb/host/xhci-exynos.c
>>>  create mode 100644 drivers/usb/host/xhci-exynos.h
>>>
>>> diff --git a/drivers/usb/host/xhci-exynos.c b/drivers/usb/host/xhci-exynos.c
>>> new file mode 100644
>>> index 000000000000..3913c48d4b20
>>> --- /dev/null
>>> +++ b/drivers/usb/host/xhci-exynos.c
>>> @@ -0,0 +1,2025 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * xhci-exynos.c - xHCI host controller driver platform Bus Glue for Exynos.
>>> + *
>>> + * Copyright (C) 2022 Samsung Electronics Incorporated - http://www.samsung.com
>>> + * Author: Daehwan Jung <dh10.jung@...sung.com>
>>> + *
>>> + * A lot of code borrowed from the Linux xHCI driver.
>>
>>> + */
>>> +
>>> +#include <linux/clk.h>
>>> +#include <linux/dma-mapping.h>
>>> +#include <linux/module.h>
>>> +#include <linux/pci.h>
>>> +#include <linux/of.h>
>>> +#include <linux/of_device.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/usb/phy.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/phy/phy.h>
>>> +#include <linux/acpi.h>
>>> +#include <linux/usb/of.h>
>>> +#ifdef CONFIG_SND_EXYNOS_USB_AUDIO
>>
>> This does not exist.
>>
>> Please do not add dead code to Linux kernel.
>>
>>> +#include "../../../sound/usb/exynos_usb_audio.h"
>>> +#include <linux/types.h>
>>> +#include "xhci-trace.h"
>>> +#endif
>>> +
>>> +#include "../core/hub.h"
>>> +#include "../core/phy.h"
>>> +#include "xhci.h"
>>> +#include "xhci-plat.h"
>>> +#include "xhci-mvebu.h"
>>> +#include "xhci-rcar.h"
>>> +#include "../dwc3/dwc3-exynos.h"
>>> +#include "../dwc3/exynos-otg.h"
>>
>> No, how XHCI is related to dwc3? What if different block provides XHCI,
>> not DWC3?
>>
>>> +#include "xhci-exynos.h"
>>> +#include <soc/samsung/exynos-cpupm.h>
>>
>> This does not exist and does not even compile.
>>
>> Please do not send code which does not compile... Also, just in case -
>> do not send code which compiles but does not work. :)
>>
> 
> Hi Krzysztof
> 
> I'm sorry to confuse you. But, it's just for reference module to introduce
> new feature. That's why I just submitted source code and header without
> makefile. It's not going to compiled at all now.

Thanks for explanation. Such of tree code must be clearly marked in
commit title and subject (e.g. RFC). Additionally this out of tree
module does not solve the problem of lack of users. For all your sound
hooks you need in-tree user.

Best regards,
Krzysztof