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Message-ID: <1599792140.14806.22.camel@mhfsdcap03>
Date: Fri, 11 Sep 2020 10:42:20 +0800
From: Crystal Guo <crystal.guo@...iatek.com>
To: Suman Anna <s-anna@...com>,
"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC: srv_heupstream <srv_heupstream@...iatek.com>,
"linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Seiya Wang (王迺君)
<seiya.wang@...iatek.com>,
Stanley Chu (朱原陞)
<stanley.chu@...iatek.com>,
Yingjoe Chen (陳英洲)
<Yingjoe.Chen@...iatek.com>,
Fan Chen (陳凡)
<fan.chen@...iatek.com>,
"Yong Liang (梁勇)"
<Yong.Liang@...iatek.com>
Subject: Re: [v4,3/4] reset-controller: ti: introduce a new reset handler
On Wed, 2020-09-09 at 23:39 +0800, Suman Anna wrote:
> On 9/8/20 9:57 PM, Crystal Guo wrote:
> > On Thu, 2020-09-03 at 07:40 +0800, Suman Anna wrote:
> >> Hi Crystal,
> >>
> >> On 8/16/20 10:03 PM, Crystal Guo wrote:
> >>> Introduce ti_syscon_reset() to integrate assert and deassert together.
> >>> If some modules need do serialized assert and deassert operations
> >>> to reset itself, reset_control_reset can be called for convenience.
> >>
> >> There are multiple changes in this same patch. I think you should split this
> >> functionality away from the change for the regmap_update_bits() to
> >> regmap_write_bits(), similar to what you have done in your v2 Patch 4.
> >>
> >
> > Thanks for your suggestion.
> > I will split this patch in the next version.
> >
> >>>
> >>> Such as reset-qcom-aoss.c, it integrates assert and deassert together
> >>> by 'reset' method. MTK Socs also need this method to perform reset.
> >>>
> >>> Signed-off-by: Crystal Guo <crystal.guo@...iatek.com>
> >>> ---
> >>> drivers/reset/reset-ti-syscon.c | 26 ++++++++++++++++++++++++--
> >>> 1 file changed, 24 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c
> >>> index a2635c21db7f..08289342f9af 100644
> >>> --- a/drivers/reset/reset-ti-syscon.c
> >>> +++ b/drivers/reset/reset-ti-syscon.c
> >>> @@ -15,6 +15,7 @@
> >>> * GNU General Public License for more details.
> >>> */
> >>>
> >>> +#include <linux/delay.h>
> >>> #include <linux/mfd/syscon.h>
> >>> #include <linux/module.h>
> >>> #include <linux/of.h>
> >>> @@ -56,6 +57,7 @@ struct ti_syscon_reset_data {
> >>> struct regmap *regmap;
> >>> struct ti_syscon_reset_control *controls;
> >>> unsigned int nr_controls;
> >>> + unsigned int reset_duration_us;
> >>> };
> >>>
> >>> #define to_ti_syscon_reset_data(rcdev) \
> >>> @@ -89,7 +91,7 @@ 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);
> >>> + return regmap_write_bits(data->regmap, control->assert_offset, mask, value);
> >>> }
> >>>
> >>> /**
> >>> @@ -120,7 +122,7 @@ 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);
> >>> + return regmap_write_bits(data->regmap, control->deassert_offset, mask, value);
> >>> }
> >>>
> >>> /**
> >>> @@ -158,9 +160,26 @@ static int ti_syscon_reset_status(struct reset_controller_dev *rcdev,
> >>> !(control->flags & STATUS_SET);
> >>> }
> >>>
> >>> +static int ti_syscon_reset(struct reset_controller_dev *rcdev,
> >>> + unsigned long id)
> >>> +{
> >>> + struct ti_syscon_reset_data *data = to_ti_syscon_reset_data(rcdev);
> >>> + int ret;
> >>> +
> >>> + ret = ti_syscon_reset_assert(rcdev, id);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (data->reset_duration_us)
> >>> + usleep_range(data->reset_duration_us, data->reset_duration_us * 2);
> >>> +
> >>> + return ti_syscon_reset_deassert(rcdev, id);
> >>
> >> I echo Philipp's comments [1] from your original v1 series about this. We don't
> >> need a property to distinguish this, but you could add a flag using match data
> >> and Mediatek compatible, and use that within this function, or optionally set
> >> this ops based on compatible (whatever is preferred by Philipp).
> >>
> >> regards
> >> Suman
> >>
> >> [1] https://patchwork.kernel.org/comment/23519193/
> >>
> > Hi Suman, Philipp
> >
> > Which method would you recommend more?
> > 1. like v2 patch, but assign the flag "data->assert_deassert_together"
> > directly (maybe rename "assert_deassert_together" to
> > "reset_op_available")
> >
> > 2. use Mediatek compatible to decide the reset handler available or not.
>
> I would go with this option. Anyway, I think you might have to add the reset SoC
> data as well, based on Rob's comment on the binding.
>
> regards
> Suman
Thanks for your suggestions
I will add the following changes in the next version,
please correct me if there is any misunderstanding.
1). revert ti-syscon-reset.txt add a new mediatek reset binding doc.
2). split the patch [v4,3/4] with the change for the
regmap_update_bits() to regmap_write_bits() and the change to integrate
assert and deassert together.
3). add the reset SoC data, which contains the flag "reset_op_available"
to decide the reset handler available or not.
4). separate the dts patch from this patch sets
> >
> > Thanks
> > Crystal
> >
> >>> +}
> >>> +
> >>> static const struct reset_control_ops ti_syscon_reset_ops = {
> >>> .assert = ti_syscon_reset_assert,
> >>> .deassert = ti_syscon_reset_deassert,
> >>> + .reset = ti_syscon_reset,
> >>> .status = ti_syscon_reset_status,
> >>> };
> >>>
> >>> @@ -204,6 +223,9 @@ static int ti_syscon_reset_probe(struct platform_device *pdev)
> >>> controls[i].flags = be32_to_cpup(list++);
> >>> }
> >>>
> >>> + of_property_read_u32(pdev->dev.of_node, "reset-duration-us",
> >>> + &data->reset_duration_us);
> >>> +
> >>> data->rcdev.ops = &ti_syscon_reset_ops;
> >>> data->rcdev.owner = THIS_MODULE;
> >>> data->rcdev.of_node = np;
> >>>
> >>
> >
>
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