linux-kernel - Re: [PATCH v4 0/3] Fix pinctrl-single pcs_pin_dbg

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Date:   Sun, 21 Mar 2021 22:56:31 -0700
From:   Drew Fustini <drew@...gleboard.org>
To:     Hanna Hawa <hhhawa@...zon.com>
Cc:     andy.shevchenko@...il.com, tony@...mide.com,
        haojian.zhuang@...aro.org, linus.walleij@...aro.org,
        dwmw@...zon.co.uk, benh@...zon.com, ronenk@...zon.com,
        talel@...zon.com, jonnyc@...zon.com, hanochu@...zon.com,
        tgershi@...zon.com, linux-arm-kernel@...ts.infradead.org,
        linux-omap@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/3] Fix pinctrl-single pcs_pin_dbg_show()

On Fri, Mar 19, 2021 at 05:21:30PM +0200, Hanna Hawa wrote:
> These patches fix the pcs_pin_dbg_show() function for the scenario where
> a single register controls multiple pins (i.e. bits_per_mux is not zero)
> Additionally, the common formula is moved to a separate function to
> allow reuse.
> 
> Changes since v3:
> -----------------
> - define and set variable 'mux_bytes' in one line
> - update commit message
> 
> Changes since v2:
> -----------------
> - move read() register to be outside of if condition (as it common
>   read()).
> - Remove extra parentheses
> - replace offset variable by direct return statements
> 
> Changes since v1:
> -----------------
> - remove unused variable in In function 'pcs_allocate_pin_table'
>   (Reported-by: kernel test robot <lkp@...el.com>)
> 
> Hanna Hawa (3):
>   pinctrl: pinctrl-single: remove unused variable
>   pinctrl: pinctrl-single: remove unused parameter
>   pinctrl: pinctrl-single: fix pcs_pin_dbg_show() when bits_per_mux is
>     not zero
> 
>  drivers/pinctrl/pinctrl-single.c | 65 ++++++++++++++++++--------------
>  1 file changed, 37 insertions(+), 28 deletions(-)
> 
> -- 
> 2.17.1
> 

I'm curious what SoC are you using?

It's good to know who has hardware to test bits_per_mux in the future.

I pay attention to pinctrl-single as that is the driver used for the TI
AM3358 SoC used in a variety of BeagleBone boards.  It does not use 
bits_per_mux, but I can verify that this does not cause any regression
for the AM3358 SoC:

  /sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single# cat pins
  registered pins: 142
  pin 0 (PIN0) 0:? 44e10800 00000027 pinctrl-single
  pin 1 (PIN1) 0:? 44e10804 00000027 pinctrl-single
  pin 2 (PIN2) 0:? 44e10808 00000027 pinctrl-single
  pin 3 (PIN3) 0:? 44e1080c 00000027 pinctrl-single
  pin 4 (PIN4) 0:? 44e10810 00000027 pinctrl-single
  pin 5 (PIN5) 0:? 44e10814 00000027 pinctrl-single
  pin 6 (PIN6) 0:? 44e10818 00000027 pinctrl-single
  pin 7 (PIN7) 0:? 44e1081c 00000027 pinctrl-single
  pin 8 (PIN8) 22:gpio-96-127 44e10820 00000027 pinctrl-single
  pin 9 (PIN9) 23:gpio-96-127 44e10824 00000037 pinctrl-single
  pin 10 (PIN10) 26:gpio-96-127 44e10828 00000037 pinctrl-single
  pin 11 (PIN11) 27:gpio-96-127 44e1082c 00000037 pinctrl-single
  pin 12 (PIN12) 0:? 44e10830 00000037 pinctrl-single
  <snip>
  pin 140 (PIN140) 0:? 44e10a30 00000028 pinctrl-single
  pin 141 (PIN141) 13:gpio-64-95 44e10a34 00000020 pinctrl-single

Reviewed-by: Drew Fustini <drew@...gleboard.org>

Thanks,
Drew