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Date: Fri, 16 Aug 2019 15:12:50 +0200
From: Simon Horman <horms@...ge.net.au>
To: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Jacopo Mondi <jacopo+renesas@...ndi.org>,
Chris Brandt <Chris.Brandt@...esas.com>,
linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] clocksource/drivers/ostm: Use unique device name
instead of ostm
On Fri, Aug 16, 2019 at 03:11:29PM +0200, Simon Horman wrote:
> On Wed, Aug 07, 2019 at 10:46:35AM +0200, Geert Uytterhoeven wrote:
> > Currently all OSTM devices are called "ostm", also in kernel messages.
> >
> > As there can be multiple instances in an SoC, this can confuse the user.
> > Hence construct a unique name from the DT node name, like is done for
> > platform devices.
> >
> > On RSK+RZA1, the boot log changes like:
> >
> > -clocksource: ostm: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 57352151442 ns
> > +clocksource: ostm fcfec000.timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 57352151442 ns
> > sched_clock: 32 bits at 33MHz, resolution 30ns, wraps every 64440619504ns
> > -ostm: used for clocksource
> > -ostm: used for clock events
> > +ostm fcfec000.timer: used for clocksource
> > +ostm fcfec400.timer: used for clock events
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
The nit in my previous email notwithstanding
Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>
> > ---
> > v3:
> > - Make the name format similar to the one used for platform devices,
> > - Use kasprintf() instead of buffer size guessing,
> > - Use a real example from rskrza1.
> >
> > v2 (by Jacopo):
> > - Use np->full_name.
> > ---
> > drivers/clocksource/renesas-ostm.c | 45 ++++++++++++++++++++----------
> > 1 file changed, 30 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/clocksource/renesas-ostm.c b/drivers/clocksource/renesas-ostm.c
> > index 1e22e54d7b0df40d..659e3ec7b86714e3 100644
> > --- a/drivers/clocksource/renesas-ostm.c
> > +++ b/drivers/clocksource/renesas-ostm.c
> > @@ -25,6 +25,7 @@
> > */
> >
> > struct ostm_device {
> > + const char *name;
> > void __iomem *base;
> > unsigned long ticks_per_jiffy;
> > struct clock_event_device ced;
> > @@ -79,9 +80,8 @@ static int __init ostm_init_clksrc(struct ostm_device *ostm, unsigned long rate)
> > writeb(CTL_FREERUN, ostm->base + OSTM_CTL);
> > writeb(TS, ostm->base + OSTM_TS);
> >
> > - return clocksource_mmio_init(ostm->base + OSTM_CNT,
> > - "ostm", rate,
> > - 300, 32, clocksource_mmio_readl_up);
> > + return clocksource_mmio_init(ostm->base + OSTM_CNT, ostm->name, rate,
> > + 300, 32, clocksource_mmio_readl_up);
> > }
> >
> > static u64 notrace ostm_read_sched_clock(void)
> > @@ -161,15 +161,14 @@ static int __init ostm_init_clkevt(struct ostm_device *ostm, unsigned int irq,
> > struct clock_event_device *ced = &ostm->ced;
> > int ret = -ENXIO;
> >
> > - ret = request_irq(irq, ostm_timer_interrupt,
> > - IRQF_TIMER | IRQF_IRQPOLL,
> > - "ostm", ostm);
> > + ret = request_irq(irq, ostm_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
> > + ostm->name, ostm);
> > if (ret) {
> > - pr_err("ostm: failed to request irq\n");
> > + pr_err("%s: Failed to request irq\n", ostm->name);
> > return ret;
> > }
> >
> > - ced->name = "ostm";
> > + ced->name = ostm->name;
> > ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC;
> > ced->set_state_shutdown = ostm_shutdown;
> > ced->set_state_periodic = ostm_set_periodic;
> > @@ -187,6 +186,7 @@ static int __init ostm_init(struct device_node *np)
> > {
> > struct clk *ostm_clk = NULL;
> > struct ostm_device *ostm;
> > + struct resource res;
> > unsigned long rate;
> > unsigned int irq;
> > int ret;
> > @@ -195,22 +195,35 @@ static int __init ostm_init(struct device_node *np)
> > if (!ostm)
> > return -ENOMEM;
> >
> > - ostm->base = of_iomap(np, 0);
> > - if (!ostm->base) {
> > + ret = of_address_to_resource(np, 0, &res);
> > + if (ret) {
> > + pr_err("ostm: Failed to obtain I/O memory\n");
> > + goto err_free;
> > + }
> > +
> > + ostm->name = kasprintf(GFP_KERNEL, "ostm %llx.%s",
> > + (unsigned long long)res.start, np->name);
>
> I'm not sure, but looking at printk-formats.rst it seems that
> %pa[p] as a format specifier for resource_size_t. If so it may
> allow dropping the cast above.
>
> > + if (!ostm->name) {
> > ret = -ENOMEM;
> > goto err_free;
> > }
> >
> > + ostm->base = ioremap(res.start, resource_size(&res));
> > + if (!ostm->base) {
> > + ret = -ENOMEM;
> > + goto err_free_name;
> > + }
> > +
> > irq = irq_of_parse_and_map(np, 0);
> > if (!irq) {
> > - pr_err("ostm: Failed to get irq\n");
> > + pr_err("%s: Failed to get irq\n", ostm->name);
> > ret = -EINVAL;
> > goto err_unmap;
> > }
> >
> > ostm_clk = of_clk_get(np, 0);
> > if (IS_ERR(ostm_clk)) {
> > - pr_err("ostm: Failed to get clock\n");
> > + pr_err("%s: Failed to get clock\n", ostm->name);
> > ostm_clk = NULL;
> > ret = PTR_ERR(ostm_clk);
> > goto err_unmap;
> > @@ -218,7 +231,7 @@ static int __init ostm_init(struct device_node *np)
> >
> > ret = clk_prepare_enable(ostm_clk);
> > if (ret) {
> > - pr_err("ostm: Failed to enable clock\n");
> > + pr_err("%s: Failed to enable clock\n", ostm->name);
> > goto err_clk_put;
> > }
> >
> > @@ -235,13 +248,13 @@ static int __init ostm_init(struct device_node *np)
> > goto err_clk_disable;
> >
> > ostm_init_sched_clock(ostm, rate);
> > - pr_info("ostm: used for clocksource\n");
> > + pr_info("%s: used for clocksource\n", ostm->name);
> > } else {
> > ret = ostm_init_clkevt(ostm, irq, rate);
> > if (ret)
> > goto err_clk_disable;
> >
> > - pr_info("ostm: used for clock events\n");
> > + pr_info("%s: used for clock events\n", ostm->name);
> > }
> >
> > return 0;
> > @@ -252,6 +265,8 @@ static int __init ostm_init(struct device_node *np)
> > clk_put(ostm_clk);
> > err_unmap:
> > iounmap(ostm->base);
> > +err_free_name:
> > + kfree(ostm->name);
> > err_free:
> > kfree(ostm);
> > return ret;
> > --
> > 2.17.1
> >
>
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