linux-kernel - RE: [PATCH 5/9] remoteproc: imx

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Message-ID: <DU0PR04MB9417B0AC80F41D425F43277C88599@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Wed, 19 Jan 2022 02:25:48 +0000
From:   Peng Fan <peng.fan@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC:     "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/9] remoteproc: imx_rproc: make clk optional

> Subject: Re: [PATCH 5/9] remoteproc: imx_rproc: make clk optional
> 
> On Tue, Jan 11, 2022 at 11:33:29AM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > To i.MX8QXP/QM/ULP and i.MX7ULP, Mcore maybe out of control of Linux.
> > And in such case, no need clk, so make clk optional with has_clk.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  drivers/remoteproc/imx_rproc.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/remoteproc/imx_rproc.c
> > b/drivers/remoteproc/imx_rproc.c index 7b2578177ea8..0e99a3ca6fbc
> > 100644
> > --- a/drivers/remoteproc/imx_rproc.c
> > +++ b/drivers/remoteproc/imx_rproc.c
> > @@ -89,6 +89,7 @@ struct imx_rproc {
> >  	struct work_struct		rproc_work;
> >  	struct workqueue_struct		*workqueue;
> >  	void __iomem			*rsc_table;
> > +	bool				has_clk;
> 
> I am usually weary of bloating structures with flags.  I suggest achieving the
> same functionality with a macro that compares priv->dcfg with the right
> imx_rproc_dcfg structure.

priv->dcfg is some kind fixed settings, however has_clk could be runtime changed,
because i.MX platform M-core support multiple booting method and it
could work w/o clk handled by Linux depending on some pre-configuration
such as moving M-core in an separate hardware partition.

Thanks,
Peng. 

> 
> >  };
> >
> >  static const struct imx_rproc_att imx_rproc_att_imx8mn[] = { @@
> > -724,6 +725,9 @@ static int imx_rproc_clk_enable(struct imx_rproc *priv)
> >  	if (dcfg->method == IMX_RPROC_NONE)
> >  		return 0;
> >
> > +	if (!priv->has_clk)
> > +		return 0;
> > +
> >  	priv->clk = devm_clk_get(dev, NULL);
> >  	if (IS_ERR(priv->clk)) {
> >  		dev_err(dev, "Failed to get clock\n"); @@ -768,6 +772,7 @@ static
> > int imx_rproc_probe(struct platform_device *pdev)
> >  	priv->rproc = rproc;
> >  	priv->dcfg = dcfg;
> >  	priv->dev = dev;
> > +	priv->has_clk = true;
> >
> >  	dev_set_drvdata(dev, rproc);
> >  	priv->workqueue = create_workqueue(dev_name(dev));
> > --
> > 2.25.1
> >