linux-kernel - Re: [PATCH v3 4/4] hwmon: Support Aspeed AST2600 PWM/Fan tachometer

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Date:   Wed, 20 Jan 2021 15:46:17 +1030
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Troy Lee" <troy_lee@...eedtech.com>, openbmc@...ts.ozlabs.org,
        "Joel Stanley" <joel@....id.au>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        "open list" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>
Cc:     "Ryan Chen" <ryan_chen@...eedtech.com>,
        "Chia-Wei, Wang" <chiawei_wang@...eedtech.com>,
        "Troy Lee" <leetroy@...il.com>, "kbuild test robot" <lkp@...el.com>
Subject: Re: [PATCH v3 4/4] hwmon: Support Aspeed AST2600 PWM/Fan tachometer

Hi Troy,

On Mon, 18 Jan 2021, at 17:20, Troy Lee wrote:
> Add Aspeed AST2600 PWM/Fan tacho driver. AST2600 has 16 PWM channel and
> 16 FAN tacho channel.
> 
> Changes since v2:
>  - declare local function as static function
> 
> Changes since v1:
>  - fixed review comments
>  - fixed double-looped calculation of div_h and div_l
>  - moving configuration to device tree
>  - register hwmon driver with devm_hwmon_device_register_with_info()
> 
> Signed-off-by: Troy Lee <troy_lee@...eedtech.com>
> Reported-by: kernel test robot <lkp@...el.com>
> ---
>  drivers/hwmon/Kconfig                |  10 +
>  drivers/hwmon/Makefile               |   1 +
>  drivers/hwmon/aspeed2600-pwm-tacho.c | 756 +++++++++++++++++++++++++++
>  3 files changed, 767 insertions(+)
>  create mode 100644 drivers/hwmon/aspeed2600-pwm-tacho.c

...

> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 09a86c5e1d29..1a415d493ffc 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_SENSORS_ARM_SCPI)	+= scpi-hwmon.o
>  obj-$(CONFIG_SENSORS_AS370)	+= as370-hwmon.o
>  obj-$(CONFIG_SENSORS_ASC7621)	+= asc7621.o
>  obj-$(CONFIG_SENSORS_ASPEED)	+= aspeed-pwm-tacho.o
> +obj-$(CONFIG_SENSORS_ASPEED2600_PWM_TACHO)	+= aspeed2600-pwm-tacho.o

Why does this have to be a separate implementation from the existing ASPEED 
PWM/Tacho driver? Is there really nothing in common?

Andrew