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Date:   Fri, 18 Sep 2020 09:53:21 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Richard Cochran <richardcochran@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: RE: [PATCH 2/2] ptp_qoriq: support FIPER3

Hi Vladimir,

> -----Original Message-----
> From: Vladimir Oltean <olteanv@...il.com>
> Sent: Saturday, September 12, 2020 3:36 PM
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: netdev@...r.kernel.org; devicetree@...r.kernel.org; David S . Miller
> <davem@...emloft.net>; Richard Cochran <richardcochran@...il.com>; Rob
> Herring <robh+dt@...nel.org>; Mark Rutland <mark.rutland@....com>
> Subject: Re: [PATCH 2/2] ptp_qoriq: support FIPER3
> 
> Hi Yangbo,
> 
> On Sat, Sep 12, 2020 at 11:30:06AM +0800, Yangbo Lu wrote:
> > The FIPER3 (fixed interval period pulse generator) is supported on
> > DPAA2 and ENETC network controller hardware. This patch is to support
> > it in ptp_qoriq driver.
> >
> > Signed-off-by: Yangbo Lu <yangbo.lu@....com>
> > ---
> >  drivers/ptp/ptp_qoriq.c       | 23 ++++++++++++++++++++++-
> >  include/linux/fsl/ptp_qoriq.h |  3 +++
> >  2 files changed, 25 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
> > index c09c16be..68beb1b 100644
> > --- a/drivers/ptp/ptp_qoriq.c
> > +++ b/drivers/ptp/ptp_qoriq.c
> > @@ -72,6 +72,10 @@ static void set_fipers(struct ptp_qoriq *ptp_qoriq)
> >  	set_alarm(ptp_qoriq);
> >  	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
> >  	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
> > +
> > +	if (ptp_qoriq->fiper3_support)
> > +		ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
> > +				 ptp_qoriq->tmr_fiper3);
> >  }
> >
> >  int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool
> update_event)
> > @@ -366,6 +370,7 @@ static u32 ptp_qoriq_nominal_freq(u32 clk_src)
> >   *   "fsl,tmr-add"
> >   *   "fsl,tmr-fiper1"
> >   *   "fsl,tmr-fiper2"
> > + *   "fsl,tmr-fiper3" (required only for DPAA2 and ENETC hardware)
> >   *   "fsl,max-adj"
> >   *
> >   * Return 0 if success
> > @@ -412,6 +417,7 @@ static int ptp_qoriq_auto_config(struct ptp_qoriq
> *ptp_qoriq,
> >  	ptp_qoriq->tmr_add = freq_comp;
> >  	ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD -
> ptp_qoriq->tclk_period;
> >  	ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD -
> ptp_qoriq->tclk_period;
> > +	ptp_qoriq->tmr_fiper3 = DEFAULT_FIPER3_PERIOD -
> ptp_qoriq->tclk_period;
> >
> >  	/* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
> >  	 * freq_ratio = reference_clock_freq / nominal_freq
> > @@ -446,6 +452,13 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq,
> void __iomem *base,
> >  	else
> >  		ptp_qoriq->extts_fifo_support = false;
> >
> > +	if (of_device_is_compatible(node, "fsl,dpaa2-ptp") ||
> > +	    of_device_is_compatible(node, "fsl,enetc-ptp")) {
> > +		ptp_qoriq->fiper3_support = true;
> > +	} else {
> > +		ptp_qoriq->fiper3_support = false;
> > +	}
> 
> Since struct ptp_qoriq is kzalloc()-ed, maybe you can skip the "else"
> branch?

Right. Let me remove it.

> 
> > +
> >  	if (of_property_read_u32(node,
> >  				 "fsl,tclk-period", &ptp_qoriq->tclk_period) ||
> >  	    of_property_read_u32(node,
> > @@ -457,7 +470,10 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq,
> void __iomem *base,
> >  	    of_property_read_u32(node,
> >  				 "fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) ||
> >  	    of_property_read_u32(node,
> > -				 "fsl,max-adj", &ptp_qoriq->caps.max_adj)) {
> > +				 "fsl,max-adj", &ptp_qoriq->caps.max_adj) ||
> > +	    (of_property_read_u32(node,
> > +				 "fsl,tmr-fiper3", &ptp_qoriq->tmr_fiper3) &&
> > +	     ptp_qoriq->fiper3_support)) {
> 
> Could you check for the "ptp_qoriq->fiper3_support" boolean first, so
> that a useless device tree property lookup is not performed?

Ok.

> 
> >  		pr_warn("device tree node missing required elements, try automatic
> configuration\n");
> >
> >  		if (ptp_qoriq_auto_config(ptp_qoriq, node))
> > @@ -502,6 +518,11 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq,
> void __iomem *base,
> >  	ptp_qoriq->write(&regs->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc);
> >  	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
> >  	ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
> > +
> > +	if (ptp_qoriq->fiper3_support)
> > +		ptp_qoriq->write(&regs->fiper_regs->tmr_fiper3,
> > +				 ptp_qoriq->tmr_fiper3);
> > +
> >  	set_alarm(ptp_qoriq);
> >  	ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl,
> >  			 tmr_ctrl|FIPERST|RTPE|TE|FRD);
> > diff --git a/include/linux/fsl/ptp_qoriq.h b/include/linux/fsl/ptp_qoriq.h
> > index 884b8f8..01acebe 100644
> > --- a/include/linux/fsl/ptp_qoriq.h
> > +++ b/include/linux/fsl/ptp_qoriq.h
> > @@ -136,6 +136,7 @@ struct ptp_qoriq_registers {
> >  #define DEFAULT_TMR_PRSC	2
> >  #define DEFAULT_FIPER1_PERIOD	1000000000
> >  #define DEFAULT_FIPER2_PERIOD	1000000000
> > +#define DEFAULT_FIPER3_PERIOD	1000000000
> >
> >  struct ptp_qoriq {
> >  	void __iomem *base;
> > @@ -147,6 +148,7 @@ struct ptp_qoriq {
> >  	struct dentry *debugfs_root;
> >  	struct device *dev;
> >  	bool extts_fifo_support;
> > +	bool fiper3_support;
> >  	int irq;
> >  	int phc_index;
> >  	u32 tclk_period;  /* nanoseconds */
> > @@ -155,6 +157,7 @@ struct ptp_qoriq {
> >  	u32 cksel;
> >  	u32 tmr_fiper1;
> >  	u32 tmr_fiper2;
> > +	u32 tmr_fiper3;
> >  	u32 (*read)(unsigned __iomem *addr);
> >  	void (*write)(unsigned __iomem *addr, u32 val);
> >  };
> > --
> > 2.7.4
> >
> 
> With that,
> 
> Acked-by: Vladimir Oltean <vladimir.oltean@....com>
> 
> Thanks for doing this!
> -Vladimir

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