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Message-ID: <20190816131129.eh4jgsdle77kulaq@verge.net.au>
Date: Fri, 16 Aug 2019 15:11:29 +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 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>
> ---
> 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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