linux-kernel - Re: [PATCH 5/6] staging: pi433: Rename enum dataMode in rf69

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Date:   Mon, 4 Dec 2017 22:21:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Marcus Wolf <marcus.wolf@...rthome-wolf.de>
Cc:     Simon Sandström <simon@...anor.nu>,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux@...f-Entwicklungen.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] staging: pi433: Rename enum dataMode in rf69_enum.h

On Mon, Dec 04, 2017 at 09:12:52PM +0200, Marcus Wolf wrote:
> 
> 
> Am 04.12.2017 um 12:24 schrieb Dan Carpenter:
> > On Sun, Dec 03, 2017 at 04:17:25PM +0100, Simon Sandström wrote:
> > > Renames enum dataMode and its values packet, continuous, continuousNoSync
> > > to enum data_mode and PACKET, CONTINUOUS, CONTINUOUS_NO_SYNC. Fixes
> > > checkpatch.pl warnings: "Avoid CamelCase: <dataMode>, <continuousNoSync>".
> > 
> > These names are too generic.  Delete them.  Use DATAMODUL_MODE_PACKET
> > and friends directly.
> > 
> > int rf69_set_data_mode(struct spi_device *spi, u8 val)
> > {
> > 	return WRITE_REG(REG_DATAMODUL, (READ_REG(REG_DATAMODUL) & ~MASK_DATAMODUL_MODE) | val);
> > }
> > 
> > Only DATAMODUL_MODE_PACKET is ever used.  There is no need to validate
> > the parameters.
> > 
> > regards,
> > dan carpenter
> > 
> 
> Hi Dan, hi Simon,
> 
> like I wrote a few days ago to Marcin Ciupak, I see two disadvantages in
> doing so.
> 
> If you want to go that way, you - as far as I believe - need to alter the
> values in rf69_enum.h, so they carry the corresponding values from
> rf69_reg.h. To avoid confusion, you will need to remove the values from
> rf69_reg.h.
> But then you have to keep track of two files (enum.h and reg.h), if you want
> to further develop register access stuff. I would prefer to keep all
> chip/register related values at the same place.

In my mind we were just deleting one of these not keeping them in sync.

> 
> Second there might be the idea of supporting different chips in the future
> (I already thought about).

Linux style is never to write code for the future.


> Then it might be, that DATAMODUL_MODE_PACKET might need an other value.

That's future code so we can delete that sentence for now.

> Therefore, I introduced the "double layer" - enums as labels for the user
> space and defines, containing the values, for the register access.

No.  We don't do abstraction layers.

regards,
dan carpenter