linux-kernel - Re: [EXT] Re: [PATCH v5 2/2] misc: nxp-sr1xx: UWB driver support for sr1xx series chip

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Date:   Wed, 30 Nov 2022 09:10:08 +0530
From:   Manjunatha Venkatesh <manjunatha.venkatesh@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, will@...nel.org, axboe@...nel.dk,
        robh+dt@...nel.org, mb@...htnvm.io, ckeepax@...nsource.cirrus.com,
        arnd@...db.d, mst@...hat.com, javier@...igon.com,
        mikelley@...rosoft.com, jasowang@...hat.com,
        sunilmut@...rosoft.com, bjorn.andersson@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        ashish.deshpande@....com, rvmanjumce@...il.com
Subject: Re: [EXT] Re: [PATCH v5 2/2] misc: nxp-sr1xx: UWB driver support for
 sr1xx series chip


On 9/14/2022 8:23 PM, Greg KH wrote:
> Caution: EXT Email
>
> On Wed, Sep 14, 2022 at 07:59:44PM +0530, Manjunatha Venkatesh wrote:
>> --- a/drivers/misc/Kconfig
>> +++ b/drivers/misc/Kconfig
>> @@ -471,6 +471,17 @@ config HISI_HIKEY_USB
>>          switching between the dual-role USB-C port and the USB-A host ports
>>          using only one USB controller.
>>
>> +config NXP_UWB
>> +    tristate "NXP UCI(Uwb Command Interface) protocol driver support"
>> +    depends on SPI
>> +    help
>> +      This option enables the UWB driver for NXP sr1xx device.
>> +      Such device supports UCI packet structure, FiRa compliant.
>> +
>> +      Say Y here to compile support for nxp-sr1xx into the kernel or
>> +      say M to compile it as a module. The module will be called
>> +      nxp-sr1xx.ko
> No tabs?
Will fix this in the next patch submission.
>> +
>>   config OPEN_DICE
>>        tristate "Open Profile for DICE driver"
>>        depends on OF_RESERVED_MEM
>> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
>> index 2be8542616dd..ee8ca32c66f6 100644
>> --- a/drivers/misc/Makefile
>> +++ b/drivers/misc/Makefile
>> @@ -60,4 +60,5 @@ obj-$(CONFIG_XILINX_SDFEC)  += xilinx_sdfec.o
>>   obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o
>>   obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o
>>   obj-$(CONFIG_OPEN_DICE)              += open-dice.o
>>   obj-$(CONFIG_VCPU_STALL_DETECTOR)    += vcpu_stall_detector.o
>> +obj-$(CONFIG_NXP_UWB)                += nxp-sr1xx.o
>> diff --git a/drivers/misc/nxp-sr1xx.c b/drivers/misc/nxp-sr1xx.c
>> new file mode 100644
>> index 000000000000..6ca9a2b54b86
>> --- /dev/null
>> +++ b/drivers/misc/nxp-sr1xx.c
>> @@ -0,0 +1,794 @@
>> +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
> Please no.  If you really want to dual-license your Linux kernel code,
> that's fine, but I will insist that you get a signed-off-by from your
> corporate lawyer so that I know that they agree with this and are
> willing to handle all of the complex issues that this entails as it will
> require work on their side over time.
>
> If that's not worth bothering your lawyers over, please just stick with
> GPL as the only license.
Dual-license is signed-off by NXP corporate lawyer. Though, we would 
like to understand what complex issues which require work over the time?
>
>> +/*
>> + * Copyright 2018-2022 NXP.
>> + *
>> + * SPI driver for UWB SR1xx
>> + * Author: Manjunatha Venkatesh <manjunatha.venkatesh@....com>
>> + */
>> +
>> +#include <linux/miscdevice.h>
>> +#include <linux/module.h>
>> +#include <linux/delay.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/of_gpio.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/uaccess.h>
>> +
>> +#define SR1XX_MAGIC 0xEA
>> +#define SR1XX_SET_PWR _IOW(SR1XX_MAGIC, 0x01, long)
>> +#define SR1XX_SET_FWD _IOW(SR1XX_MAGIC, 0x02, long)
> You can't stick ioctl command definitions in a .c file that userspace
> never sees.  How are your userspace tools supposed to know what the
> ioctl is and how it is defined?
We will move ioctl command definitions into user space header file as 
part of our next patch submission.
> How was this ever tested and where is your userspace code that interacts
> with this code?
We will share the corresponding user space code soon,meanwhile can you 
please suggest how to share this user space code?
> thanks,
>
> greg k-h