linux-kernel - Re: [PATCH 2/2] i3c: dw: Add optional apb clock

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Date: Tue, 18 Jun 2024 22:09:32 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Aniket <aniketmaurya@...gle.com>
Cc: Jeremy Kerr <jk@...econstruct.com.au>, Joel Stanley <joel@....id.au>,
	Billy Tsai <billy_tsai@...eedtech.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] i3c: dw: Add optional apb clock

On 18/06/2024 22:06:00+0200, Alexandre Belloni wrote:
> Hello,
> 
> On 11/06/2024 17:16:00+0000, Aniket wrote:
> > Besides the core clock, IP also has an apb
> > interface clock. Add an optional hook for
> > the same and appropriately enable and disable.
> > 
> > Signed-off-by: Aniket <aniketmaurya@...gle.com>
> > ---
> >  drivers/i3c/master/dw-i3c-master.c | 12 ++++++++++++
> >  drivers/i3c/master/dw-i3c-master.h |  1 +
> >  2 files changed, 13 insertions(+)
> > 
> > diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> > index 77a2a1c3fd1d..41cdfd6741e3 100644
> > --- a/drivers/i3c/master/dw-i3c-master.c
> > +++ b/drivers/i3c/master/dw-i3c-master.c
> > @@ -1470,12 +1470,20 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
> >  	if (IS_ERR(master->core_clk))
> >  		return PTR_ERR(master->core_clk);
> >  
> > +	master->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
> > +	if (IS_ERR(master->pclk))
> > +		return PTR_ERR(master->pclk);
> > +
> 
> I guess you need to update the device tree binding documentation too.

Sorry, you did and you had changes requested, forget about that.
> 
> >  	master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
> >  								    "core_rst");
> >  	if (IS_ERR(master->core_rst))
> >  		return PTR_ERR(master->core_rst);
> >  
> >  	ret = clk_prepare_enable(master->core_clk);

It could be worth having a look at devm_clk_get_optional_enabled

> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = clk_prepare_enable(master->pclk);
> >  	if (ret)
> >  		goto err_disable_core_clk;
> >  
> > @@ -1520,6 +1528,8 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
> >  err_assert_rst:
> >  	reset_control_assert(master->core_rst);
> >  
> > +	clk_disable_unprepare(master->pclk);
> > +
> >  err_disable_core_clk:
> >  	clk_disable_unprepare(master->core_clk);
> >  
> > @@ -1533,6 +1543,8 @@ void dw_i3c_common_remove(struct dw_i3c_master *master)
> >  
> >  	reset_control_assert(master->core_rst);
> >  
> > +	clk_disable_unprepare(master->pclk);
> > +
> >  	clk_disable_unprepare(master->core_clk);
> >  }
> >  EXPORT_SYMBOL_GPL(dw_i3c_common_remove);
> > diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
> > index 8cb617b8147e..50c38e790c0e 100644
> > --- a/drivers/i3c/master/dw-i3c-master.h
> > +++ b/drivers/i3c/master/dw-i3c-master.h
> > @@ -36,6 +36,7 @@ struct dw_i3c_master {
> >  	void __iomem *regs;
> >  	struct reset_control *core_rst;
> >  	struct clk *core_clk;
> > +	struct clk *pclk;
> >  	char version[5];
> >  	char type[5];
> >  	bool ibi_capable;
> > -- 
> > 2.45.2.505.gda0bf45e8d-goog
> > 
> 
> -- 
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com