Re: [v2,5/6] reset-controller: ti: Introduce force-update method

[Crystal Guo <crystal.guo@mediatek.com>]

On Tue, 2020-08-04 at 15:03 +0800, Philipp Zabel wrote:
> Hi Crystal,
> 
> On Mon, 2020-08-03 at 14:15 +0800, Crystal Guo wrote:
> > Introduce force-update method for assert and deassert interface,
> > which force the write operation in case the read already happens
> > to return the correct value.
> > 
> > Signed-off-by: Crystal Guo <crystal.guo@mediatek.com>
> 
> Added Suman and Andrew for confirmation: I think writing unconditionally
> can't break any existing user. Just changing to regmap_write_bits()
> instead of adding the update-force property as in v1 should be fine.
> 
> regards
> Philipp
> 
Hi Suman, Andrew,

Can you help to give some suggestions about this change.
Is this can be changed to write unconditionally, or should I add a
update-force property to force the write operation.

Best regards
Crystal.

> > ---
> >  drivers/reset/reset-ti-syscon.c | 15 +++++++++++++--
> >  1 file changed, 13 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c
> > index 1c74bcb9a6c3..f4baf78afd14 100644
> > --- a/drivers/reset/reset-ti-syscon.c
> > +++ b/drivers/reset/reset-ti-syscon.c
> > @@ -57,6 +57,7 @@ struct ti_syscon_reset_data {
> >  	struct ti_syscon_reset_control *controls;
> >  	unsigned int nr_controls;
> >  	bool assert_deassert_together;
> > +	bool update_force;
> >  };
> >  
> >  #define to_ti_syscon_reset_data(rcdev)	\
> > @@ -90,7 +91,10 @@ static int ti_syscon_reset_assert(struct reset_controller_dev *rcdev,
> >  	mask = BIT(control->assert_bit);
> >  	value = (control->flags & ASSERT_SET) ? mask : 0x0;
> >  
> > -	return regmap_update_bits(data->regmap, control->assert_offset, mask, value);
> > +	if (data->update_force)
> > +		return regmap_write_bits(data->regmap, control->assert_offset, mask, value);
> > +	else
> > +		return regmap_update_bits(data->regmap, control->assert_offset, mask, value);
> >  }
> >  
> >  /**
> > @@ -121,7 +125,10 @@ static int ti_syscon_reset_deassert(struct reset_controller_dev *rcdev,
> >  	mask = BIT(control->deassert_bit);
> >  	value = (control->flags & DEASSERT_SET) ? mask : 0x0;
> >  
> > -	return regmap_update_bits(data->regmap, control->deassert_offset, mask, value);
> > +	if (data->update_force)
> > +		return regmap_write_bits(data->regmap, control->deassert_offset, mask, value);
> > +	else
> > +		return regmap_update_bits(data->regmap, control->deassert_offset, mask, value);
> >  }
> >  
> >  /**
> > @@ -223,6 +230,10 @@ static int ti_syscon_reset_probe(struct platform_device *pdev)
> >  		data->assert_deassert_together = true;
> >  	else
> >  		data->assert_deassert_together = false;
> > +	if (of_property_read_bool(np, "update-force"))
> > +		data->update_force = true;
> > +	else
> > +		data->update_force = false;
> >  
> >  	data->rcdev.ops = &ti_syscon_reset_ops;
> >  	data->rcdev.owner = THIS_MODULE;
> > -- 
> > 2.18.0