Re: [PATCH v2 13/20] nvmem: core: drop priv pointer in post process callback

[Michael Walle <michael@xxxxxxxx>]

Am 2022-09-09 10:52, schrieb Srinivas Kandagatla:
> On 01/09/2022 23:18, Michael Walle wrote:
> > It doesn't make any more sense to have a opaque pointer set up by the
> > nvmem device. Usually, the layout isn't associated with a particular
> > nvmem device.
> This is really not a good idea to remove the context pointer, as this
> is the only way for callback to get context which it can make use of.

In which case? As I mentioned it's the priv to the nvmem driver and all
the "normal" callbacks can do very little with it. If there will be a
future need, then there should be a proper opaque pointer associated
with the layout and not the nvmem driver.

-michael

> I would prefer this to be left as it is.
>
> --srini
>
> > Signed-off-by: Michael Walle <michael@xxxxxxxx>
> > ---
> > changes since v1:
> >   - new patch
> >
> >   drivers/nvmem/core.c           | 4 ++--
> >   drivers/nvmem/imx-ocotp.c      | 4 ++--
> >   include/linux/nvmem-provider.h | 5 +++--
> >   3 files changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> > index d31d3f0ab517..6910796937f9 100644
> > --- a/drivers/nvmem/core.c
> > +++ b/drivers/nvmem/core.c
> > @@ -1523,8 +1523,8 @@ static int __nvmem_cell_read(struct nvmem_device 
> > *nvmem,
> >   		nvmem_shift_read_buffer_in_place(cell, buf);
> >     	if (cell->read_post_process) {
> > -		rc = cell->read_post_process(nvmem->priv, id, index,
> > -					     cell->offset, buf, cell->bytes);
> > +		rc = cell->read_post_process(id, index, cell->offset, buf,
> > +					     cell->bytes);
> >   		if (rc)
> >   			return rc;
> >   	}
> > diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
> > index ac0edb6398f1..5e869d4a81c5 100644
> > --- a/drivers/nvmem/imx-ocotp.c
> > +++ b/drivers/nvmem/imx-ocotp.c
> > @@ -222,8 +222,8 @@ static int imx_ocotp_read(void *context, unsigned 
> > int offset,
> >   	return ret;
> >   }
> >   -static int imx_ocotp_cell_pp(void *context, const char *id, int 
> > index,
> > -			     unsigned int offset, void *data, size_t bytes)
> > +static int imx_ocotp_cell_pp(const char *id, int index, unsigned int 
> > offset,
> > +			     void *data, size_t bytes)
> >   {
> >   	u8 *buf = data;
> >   	int i;
> > diff --git a/include/linux/nvmem-provider.h 
> > b/include/linux/nvmem-provider.h
> > index 9d22dc5a3fa5..46067a6a0395 100644
> > --- a/include/linux/nvmem-provider.h
> > +++ b/include/linux/nvmem-provider.h
> > @@ -19,8 +19,9 @@ typedef int (*nvmem_reg_read_t)(void *priv, unsigned 
> > int offset,
> >   typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
> >   				 void *val, size_t bytes);
> >   /* used for vendor specific post processing of cell data */
> > -typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, 
> > int index,
> > -					 unsigned int offset, void *buf, size_t bytes);
> > +typedef int (*nvmem_cell_post_process_t)(const char *id, int index,
> > +					 unsigned int offset, void *buf,
> > +					 size_t bytes);
> >     enum nvmem_type {
> >   	NVMEM_TYPE_UNKNOWN = 0,