lkml.org 
[lkml]   [2020]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 01/23] mtd: spi-nor: Stop prefixing generic functions with a manufacturer name
Date
On Friday, March 13, 2020 4:30:48 PM EET Tudor.Ambarus@microchip.com wrote:
> > > > - * macronix_set_4byte() - Set 4-byte address mode for Macronix
> > > > flashes.
> > > > + * spi_nor_en4_ex4_set_4byte() - Enter/Exit 4-byte mode for Macronix
> > > > like
> > > > + * flashes.
> > > >
> > > > * @nor: pointer to 'struct spi_nor'.
> > > > * @enable: true to enter the 4-byte address mode, false to exit
> > > > the 4-byte * address mode.
> > > > *
> > > > * Return: 0 on success, -errno otherwise.
> > > > */
> > > >
> > > > -static int macronix_set_4byte(struct spi_nor *nor, bool enable)
> > > > +static int spi_nor_en4_ex4_set_4byte(struct spi_nor *nor, bool
> > > > enable)
> > >
> > > Sounds a bit weird, how about simplifying this to:
> > > spi_nor_set_4byte_addr_mode()
> > >
> > > Or if you want to be specific:
> > > spi_nor_en_ex_4byte_addr_mode()
> >
> > You're right. Maybe we can simplify things by having a single function
> > that does optional steps based on new flags
> >
> > SPI_NOR_EN_EX_4B_NEEDS_WEN
> > SPI_NOR_CLEAR_EAR_ON_4B_EXIT
> >
> > This should probably be done in a separate patch though, so ack on the
> > spi_nor_en_ex_4byte_addr_mode() rename, assuming we also change the
> > bool argument name to enter.
>
> A single big function will be ugly to handle because of the
> spansion_set_4byte() -> it uses a different opcode.
>
> I like the nor->params>set_4byte hook.
>
> I think that spi_nor_en4_ex4_set_4byte() can be renamed to
> spi_nor_set_4byte() and be the only set_4byte() method exposed to
> manufacturers.
> spansion_set_4byte() will be static in core.c and the rest will be private
> in the manufacturer drivers.
>
> Here's how the manufacturers enter and exit the 4 byte mode:
> -> eon, gidadevice, issi, macronix, xmc use EN4B/EX4B
> -> micron-st needs WEN -> private method as they are the only ones that
> require this
> -> newer spansion have a 4BAM opcode (new, public command), older spansion
> flashes use BRWR (legacy in core.c, spansion_set_4byte())
> -> winbond set_4byte method is hackish and may be reason for just a flash
> fixup hook -> private method

I'll drop the set_4byte changes from this patch. I'm adding a dedicated patch
immediately after this, to implement what I said above.

Cheers,
ta


\
 
 \ /
  Last update: 2020-03-13 16:50    [W:0.128 / U:2.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site