linux-kernel - Re: [PATCH 4/5] gpio: xilinx: Utilize generic bitmap_get_value and _set

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Date:   Tue, 5 Jan 2021 12:04:03 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Syed Nayyar Waris <syednwaris@...il.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>
CC:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "William Breathitt Gray" <vilhelm.gray@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        "Arnd Bergmann" <arnd@...db.de>,
        Robert Richter <rrichter@...vell.com>,
        "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "(Exiting) Amit Kucheria" <amit.kucheria@...durent.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 4/5] gpio: xilinx: Utilize generic bitmap_get_value and
 _set_value

Hi, +Srinivas,

On 27. 12. 20 22:29, Linus Walleij wrote:
> On Sat, Dec 26, 2020 at 7:44 AM Syed Nayyar Waris <syednwaris@...il.com> wrote:
> 
>> This patch reimplements the xgpio_set_multiple() function in
>> drivers/gpio/gpio-xilinx.c to use the new generic functions:
>> bitmap_get_value() and bitmap_set_value(). The code is now simpler
>> to read and understand. Moreover, instead of looping for each bit
>> in xgpio_set_multiple() function, now we can check each channel at
>> a time and save cycles.
>>
>> Cc: William Breathitt Gray <vilhelm.gray@...il.com>
>> Cc: Bartosz Golaszewski <bgolaszewski@...libre.com>
>> Cc: Michal Simek <michal.simek@...inx.com>
>> Signed-off-by: Syed Nayyar Waris <syednwaris@...il.com>
> 
> (...)
> 
>> +#include <../drivers/gpio/clump_bits.h>
> 
> What is this?
> 
> Isn't a simple
> 
> #include "clump_bits.h"
> 
> enough?
> 
> We need an ACK from the Xilinx people that they think this
> actually improves the readability and maintainability of their
> driver.

Srinivas is going to send some patches against this driver. That's why
please take a look if both of these changes are fitting together.

Thanks,
Michal