linux-kernel - Re: [PATCH V2 09/12] clk: mediatek: reset: Add support for input offset and bit from DT

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Date:   Fri, 22 Apr 2022 13:06:11 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <mturquette@...libre.com>, <sboyd@...nel.org>
CC:     <matthias.bgg@...il.com>, <p.zabel@...gutronix.de>,
        <chun-jie.chen@...iatek.com>, <wenst@...omium.org>,
        <runyang.chen@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <allen-kh.cheng@...iatek.com>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH V2 09/12] clk: mediatek: reset: Add support for input
 offset and bit from DT

On Thu, 2022-04-21 at 11:07 +0200, AngeloGioacchino Del Regno wrote:
> Il 20/04/22 15:05, Rex-BC Chen ha scritto:
> > To use the clock reset function easier, we implement the of_xlate.
> > This function is only adopted in version MTK_SET_CLR because of
> > the method of id calculation.
> > 
> > There is no impact for original use. If the argument number is not
> > larger than 1, it will return original id.
> > 
> > With this implementation if we want to set offset 0x120 and bit 16,
> > we can just write something like "resets = <&infra_rst 0x120 16>;".
> > 
> > Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> > ---
> >   drivers/clk/mediatek/reset.c | 24 ++++++++++++++++++++++++
> >   drivers/clk/mediatek/reset.h |  1 +
> >   2 files changed, 25 insertions(+)
> > 
> > diff --git a/drivers/clk/mediatek/reset.c
> > b/drivers/clk/mediatek/reset.c
> > index 1173111af3ab..dbe812062bf5 100644
> > --- a/drivers/clk/mediatek/reset.c
> > +++ b/drivers/clk/mediatek/reset.c
> > @@ -59,6 +59,20 @@ static const struct reset_control_ops
> > mtk_reset_ops_set_clr = {
> >   	.reset = mtk_reset_set_clr,
> >   };
> >   
> > +static int reset_xlate(struct reset_controller_dev *rcdev,
> > +		       const struct of_phandle_args *reset_spec)
> > +{
> > +	unsigned int offset, bit;
> > +
> > +	if (reset_spec->args_count <= 1)
> > +		return reset_spec->args[0];
> > +
> > +	offset = reset_spec->args[0];
> > +	bit = reset_spec->args[1];
> > +
> > +	return (offset >> 4) * 32 + bit;
> > +}
> > +
> >   static const struct reset_control_ops *rst_op[MTK_RST_MAX] = {
> >   	[MTK_RST_SIMPLE] = &reset_simple_ops,
> >   	[MTK_RST_SET_CLR] = &mtk_reset_ops_set_clr,
> > @@ -98,6 +112,11 @@ int mtk_clk_register_rst_ctrl(struct
> > device_node *np,
> >   	data->rcdev.ops = rst_op[desc->version];
> >   	data->rcdev.of_node = np;
> >   
> > +	if (desc->version == MTK_RST_SET_CLR) {
> 
> ...following my previous advice to use switch(version), this would
> fit in
> just fine :-)
> 
> Everything else looks ok.
> 
> Cheers,
> Angelo

Hello Angelo,

I will add this judgement in reset_xlate()

BRs,
Rex