| Message ID | 20240920075306.704665-2-sergio.paracuellos@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | clocksource: move System Tick Counter from 'arch/mips/ralink' | expand |
On 20/09/2024 09:53, Sergio Paracuellos wrote: > System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This > driver has been in 'arch/mips/ralink' directory since the beggining of > Ralink architecture support. However, it can be moved into a more proper > place in 'drivers/clocksource'. Hence add it here adding also support for > compile test targets. > > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> > --- > drivers/clocksource/Kconfig | 10 ++ > drivers/clocksource/Makefile | 1 + > drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ > 3 files changed, 161 insertions(+) > create mode 100644 drivers/clocksource/timer-ralink.c > > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig > index 95dd4660b5b6..50339f4d3201 100644 > --- a/drivers/clocksource/Kconfig > +++ b/drivers/clocksource/Kconfig > @@ -753,4 +753,14 @@ config EP93XX_TIMER > Enables support for the Cirrus Logic timer block > EP93XX. > > +config CLKSRC_RALINK It is a timer RALINK_TIMER > + bool "Ralink System Tick Counter" Silent option please if possible. Let the platform Kconfig selects the driver > + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST > + default y if SOC_RT305X || SOC_MT7620 You should have something similar the RISCV option, no default option > + select CLKSRC_MMIO > + select TIMER_OF > + help > + Enables support for system tick counter present on > + Ralink SoCs RT3352 and MT7620. > + > endmenu > diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile > index 22743785299e..c9214afcb712 100644 > --- a/drivers/clocksource/Makefile You should use git mv Otherwise the code is like submitting a new driver
Hi Daniel, Thanks for reviewing this. On Mon, Oct 28, 2024 at 5:29 PM Daniel Lezcano <daniel.lezcano@linaro.org> wrote: > > On 20/09/2024 09:53, Sergio Paracuellos wrote: > > System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This > > driver has been in 'arch/mips/ralink' directory since the beggining of > > Ralink architecture support. However, it can be moved into a more proper > > place in 'drivers/clocksource'. Hence add it here adding also support for > > compile test targets. > > > > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> > > --- > > drivers/clocksource/Kconfig | 10 ++ > > drivers/clocksource/Makefile | 1 + > > drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ > > 3 files changed, 161 insertions(+) > > create mode 100644 drivers/clocksource/timer-ralink.c > > > > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig > > index 95dd4660b5b6..50339f4d3201 100644 > > --- a/drivers/clocksource/Kconfig > > +++ b/drivers/clocksource/Kconfig > > @@ -753,4 +753,14 @@ config EP93XX_TIMER > > Enables support for the Cirrus Logic timer block > > EP93XX. > > > > +config CLKSRC_RALINK > > It is a timer > > RALINK_TIMER Sure, I will change to RALINK_TIMER instead. > > > + bool "Ralink System Tick Counter" > > Silent option please if possible. > > Let the platform Kconfig selects the driver > > > + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST > > + default y if SOC_RT305X || SOC_MT7620 > > You should have something similar the RISCV option, no default option Sorry, I am not the best with Kconfig so I am not sure what you are exactly expecting here. Does the following work for you? config RALINK_TIMER bool "Ralink System Tick Counter" if COMPILE_TEST depends on SOC_RT305X || SOC_MT7620 select CLKSRC_MMIO select TIMER_OF help Enables support for system tick counter present on Ralink SoCs RT3352 and MT7620. > > > + select CLKSRC_MMIO > > + select TIMER_OF > > + help > > + Enables support for system tick counter present on > > + Ralink SoCs RT3352 and MT7620. > > + > > endmenu > > diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile > > index 22743785299e..c9214afcb712 100644 > > --- a/drivers/clocksource/Makefile > > You should use git mv > > Otherwise the code is like submitting a new driver Ok, i will squash two patches in one performing the git mv then. Thanks, Sergio Paracuellos > > > > -- > <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs > > Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | > <http://twitter.com/#!/linaroorg> Twitter | > <http://www.linaro.org/linaro-blog/> Blog
On 28/10/2024 19:04, Sergio Paracuellos wrote: > Hi Daniel, > > Thanks for reviewing this. > > On Mon, Oct 28, 2024 at 5:29 PM Daniel Lezcano > <daniel.lezcano@linaro.org> wrote: >> >> On 20/09/2024 09:53, Sergio Paracuellos wrote: >>> System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This >>> driver has been in 'arch/mips/ralink' directory since the beggining of >>> Ralink architecture support. However, it can be moved into a more proper >>> place in 'drivers/clocksource'. Hence add it here adding also support for >>> compile test targets. >>> >>> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> >>> --- >>> drivers/clocksource/Kconfig | 10 ++ >>> drivers/clocksource/Makefile | 1 + >>> drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ >>> 3 files changed, 161 insertions(+) >>> create mode 100644 drivers/clocksource/timer-ralink.c >>> >>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig >>> index 95dd4660b5b6..50339f4d3201 100644 >>> --- a/drivers/clocksource/Kconfig >>> +++ b/drivers/clocksource/Kconfig >>> @@ -753,4 +753,14 @@ config EP93XX_TIMER >>> Enables support for the Cirrus Logic timer block >>> EP93XX. >>> >>> +config CLKSRC_RALINK >> >> It is a timer >> >> RALINK_TIMER > > Sure, I will change to RALINK_TIMER instead. > >> >>> + bool "Ralink System Tick Counter" >> >> Silent option please if possible. >> >> Let the platform Kconfig selects the driver >> >>> + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST >>> + default y if SOC_RT305X || SOC_MT7620 >> >> You should have something similar the RISCV option, no default option > > Sorry, I am not the best with Kconfig so I am not sure what you are > exactly expecting here.MT7620 > Does the following work for you? > > config RALINK_TIMER > bool "Ralink System Tick Counter" if COMPILE_TEST > depends on SOC_RT305X || SOC_MT7620 > select CLKSRC_MMIO > select TIMER_OF > help > Enables support for system tick counter present on > Ralink SoCs RT3352 and MT7620. Basically the idea is to have the platform's Kconfig selecting the RALINK_TIMER. If I'm not wrong the Kconfig in arch/riscv/ralink should select RALINK_TIMER under the "config SOC_RT305X" and "config SOC_MT7620". The block "config CLKEVT_RT3352" has to be removed. Then this (clocksource) Kconfig option is a silent option. The user won't have to figure out which option to enable because that will be done directly when selecting RT305X or MT7620. The only reason to not have it silent is if you really want to opt-out this timer because it is not present on a different version of RT305X or MT7620. IOW, this option should be: config RALINK_TIMER bool "Ralink System Tick Counter" if COMPILE_TEST select CLKSRC_MMIO select TIMER_OF help Enables support for system tick counter present on Ralink SoCs RT3352 and MT7620. The option COMPILE_TEST is to compile on different platforms, thus increasing the compilation test coverage. At the first glance, the driver does not seem to pull arch dependent code except definitions which look compatible with other archs, so it should be fine. >>> + select CLKSRC_MMIO >>> + select TIMER_OF >>> + help >>> + Enables support for system tick counter present on >>> + Ralink SoCs RT3352 and MT7620. >>> + >>> endmenu >>> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile >>> index 22743785299e..c9214afcb712 100644 >>> --- a/drivers/clocksource/Makefile >> >> You should use git mv >> >> Otherwise the code is like submitting a new driver > > Ok, i will squash two patches in one performing the git mv then. > > Thanks, > Sergio Paracuellos >> >> >> >> -- >> <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs >> >> Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | >> <http://twitter.com/#!/linaroorg> Twitter | >> <http://www.linaro.org/linaro-blog/> Blog
Hi Daniel, Thanks a lot for the detailed explanation. It was really helpful. On Mon, Oct 28, 2024 at 7:44 PM Daniel Lezcano <daniel.lezcano@linaro.org> wrote: > > On 28/10/2024 19:04, Sergio Paracuellos wrote: > > Hi Daniel, > > > > Thanks for reviewing this. > > > > On Mon, Oct 28, 2024 at 5:29 PM Daniel Lezcano > > <daniel.lezcano@linaro.org> wrote: > >> > >> On 20/09/2024 09:53, Sergio Paracuellos wrote: > >>> System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This > >>> driver has been in 'arch/mips/ralink' directory since the beggining of > >>> Ralink architecture support. However, it can be moved into a more proper > >>> place in 'drivers/clocksource'. Hence add it here adding also support for > >>> compile test targets. > >>> > >>> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> > >>> --- > >>> drivers/clocksource/Kconfig | 10 ++ > >>> drivers/clocksource/Makefile | 1 + > >>> drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ > >>> 3 files changed, 161 insertions(+) > >>> create mode 100644 drivers/clocksource/timer-ralink.c > >>> > >>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig > >>> index 95dd4660b5b6..50339f4d3201 100644 > >>> --- a/drivers/clocksource/Kconfig > >>> +++ b/drivers/clocksource/Kconfig > >>> @@ -753,4 +753,14 @@ config EP93XX_TIMER > >>> Enables support for the Cirrus Logic timer block > >>> EP93XX. > >>> > >>> +config CLKSRC_RALINK > >> > >> It is a timer > >> > >> RALINK_TIMER > > > > Sure, I will change to RALINK_TIMER instead. > > > >> > >>> + bool "Ralink System Tick Counter" > >> > >> Silent option please if possible. > >> > >> Let the platform Kconfig selects the driver > >> > >>> + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST > >>> + default y if SOC_RT305X || SOC_MT7620 > >> > >> You should have something similar the RISCV option, no default option > > > > Sorry, I am not the best with Kconfig so I am not sure what you are > > exactly expecting here.MT7620 > > Does the following work for you? > > > > config RALINK_TIMER > > bool "Ralink System Tick Counter" if COMPILE_TEST > > depends on SOC_RT305X || SOC_MT7620 > > select CLKSRC_MMIO > > select TIMER_OF > > help > > Enables support for system tick counter present on > > Ralink SoCs RT3352 and MT7620. > > Basically the idea is to have the platform's Kconfig selecting the > RALINK_TIMER. If I'm not wrong the Kconfig in arch/riscv/ralink should > select RALINK_TIMER under the "config SOC_RT305X" and "config > SOC_MT7620". The block "config CLKEVT_RT3352" has to be removed. > > Then this (clocksource) Kconfig option is a silent option. The user > won't have to figure out which option to enable because that will be > done directly when selecting RT305X or MT7620. > > The only reason to not have it silent is if you really want to opt-out > this timer because it is not present on a different version of RT305X or > MT7620. Ok, then I don't want to silence it since those ralink's platform SOC_RT305X and SOC_MT7620 includes other SoCs models that do not have this timer (rt3050, mt7628 for example). Only models rt3352 and mt7620 include this. So I guess having this is the correct thing to do: config RALINK_TIMER bool "Ralink System Tick Counter" if COMPILE_TEST depends on SOC_RT305X || SOC_MT7620 select CLKSRC_MMIO select TIMER_OF help Enables support for system tick counter present on Ralink SoCs RT3352 and MT7620. Are you ok with this? > > IOW, this option should be: > > config RALINK_TIMER > bool "Ralink System Tick Counter" if COMPILE_TEST > select CLKSRC_MMIO > select TIMER_OF > help > Enables support for system tick counter present on > Ralink SoCs RT3352 and MT7620. > > The option COMPILE_TEST is to compile on different platforms, thus > increasing the compilation test coverage. At the first glance, the > driver does not seem to pull arch dependent code except definitions > which look compatible with other archs, so it should be fine. Yes, there is no arch dependencies since the only include which was dependent was not really needed and I already got rid of it when I performed the git mv. I already checked that the driver is properly compiled for allyesconfig target. Thanks, Sergio Paracuellos > > > >>> + select CLKSRC_MMIO > >>> + select TIMER_OF > >>> + help > >>> + Enables support for system tick counter present on > >>> + Ralink SoCs RT3352 and MT7620. > >>> + > >>> endmenu > >>> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile > >>> index 22743785299e..c9214afcb712 100644 > >>> --- a/drivers/clocksource/Makefile > >> > >> You should use git mv > >> > >> Otherwise the code is like submitting a new driver > > > > Ok, i will squash two patches in one performing the git mv then. > > > > Thanks, > > Sergio Paracuellos > >> > >> > >> > >> -- > >> <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs > >> > >> Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | > >> <http://twitter.com/#!/linaroorg> Twitter | > >> <http://www.linaro.org/linaro-blog/> Blog > > > -- > <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs > > Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | > <http://twitter.com/#!/linaroorg> Twitter | > <http://www.linaro.org/linaro-blog/> Blog
On 28/10/2024 20:02, Sergio Paracuellos wrote: > Hi Daniel, > > Thanks a lot for the detailed explanation. It was really helpful. > > On Mon, Oct 28, 2024 at 7:44 PM Daniel Lezcano > <daniel.lezcano@linaro.org> wrote: >> >> On 28/10/2024 19:04, Sergio Paracuellos wrote: >>> Hi Daniel, >>> >>> Thanks for reviewing this. >>> >>> On Mon, Oct 28, 2024 at 5:29 PM Daniel Lezcano >>> <daniel.lezcano@linaro.org> wrote: >>>> >>>> On 20/09/2024 09:53, Sergio Paracuellos wrote: >>>>> System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This >>>>> driver has been in 'arch/mips/ralink' directory since the beggining of >>>>> Ralink architecture support. However, it can be moved into a more proper >>>>> place in 'drivers/clocksource'. Hence add it here adding also support for >>>>> compile test targets. >>>>> >>>>> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> >>>>> --- >>>>> drivers/clocksource/Kconfig | 10 ++ >>>>> drivers/clocksource/Makefile | 1 + >>>>> drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ >>>>> 3 files changed, 161 insertions(+) >>>>> create mode 100644 drivers/clocksource/timer-ralink.c >>>>> >>>>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig >>>>> index 95dd4660b5b6..50339f4d3201 100644 >>>>> --- a/drivers/clocksource/Kconfig >>>>> +++ b/drivers/clocksource/Kconfig >>>>> @@ -753,4 +753,14 @@ config EP93XX_TIMER >>>>> Enables support for the Cirrus Logic timer block >>>>> EP93XX. >>>>> >>>>> +config CLKSRC_RALINK >>>> >>>> It is a timer >>>> >>>> RALINK_TIMER >>> >>> Sure, I will change to RALINK_TIMER instead. >>> >>>> >>>>> + bool "Ralink System Tick Counter" >>>> >>>> Silent option please if possible. >>>> >>>> Let the platform Kconfig selects the driver >>>> >>>>> + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST >>>>> + default y if SOC_RT305X || SOC_MT7620 >>>> >>>> You should have something similar the RISCV option, no default option >>> >>> Sorry, I am not the best with Kconfig so I am not sure what you are >>> exactly expecting here.MT7620 >>> Does the following work for you? >>> >>> config RALINK_TIMER >>> bool "Ralink System Tick Counter" if COMPILE_TEST >>> depends on SOC_RT305X || SOC_MT7620 >>> select CLKSRC_MMIO >>> select TIMER_OF >>> help >>> Enables support for system tick counter present on >>> Ralink SoCs RT3352 and MT7620. >> >> Basically the idea is to have the platform's Kconfig selecting the >> RALINK_TIMER. If I'm not wrong the Kconfig in arch/riscv/ralink should >> select RALINK_TIMER under the "config SOC_RT305X" and "config >> SOC_MT7620". The block "config CLKEVT_RT3352" has to be removed. >> >> Then this (clocksource) Kconfig option is a silent option. The user >> won't have to figure out which option to enable because that will be >> done directly when selecting RT305X or MT7620. >> >> The only reason to not have it silent is if you really want to opt-out >> this timer because it is not present on a different version of RT305X or >> MT7620. > > Ok, then I don't want to silence it since those ralink's platform > SOC_RT305X and SOC_MT7620 includes other SoCs models that do not have > this timer (rt3050, mt7628 for example). Only models > rt3352 and mt7620 include this. So I guess having this is the correct > thing to do: > > config RALINK_TIMER > bool "Ralink System Tick Counter" if COMPILE_TEST > depends on SOC_RT305X || SOC_MT7620 > select CLKSRC_MMIO > select TIMER_OF > help > Enables support for system tick counter present on > Ralink SoCs RT3352 and MT7620. > > Are you ok with this? No because it is a compile test option only. You may want to do the same as: https://lore.kernel.org/all/20241001-arm64-vexpress-sp804-v3-1-0a2d3f7883e4@kernel.org/ It should be: config RALINK_TIMER bool "Ralink System Tick Counter" depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST select CLKSRC_MMIO select TIMER_OF help Enables support for system tick counter present on Ralink SoCs RT3352 and MT7620. so very similar to the initial patch except no default is needed as it should be set from SOC_RT305X or SOC_MT7620
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 95dd4660b5b6..50339f4d3201 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -753,4 +753,14 @@ config EP93XX_TIMER Enables support for the Cirrus Logic timer block EP93XX. +config CLKSRC_RALINK + bool "Ralink System Tick Counter" + depends on SOC_RT305X || SOC_MT7620 || COMPILE_TEST + default y if SOC_RT305X || SOC_MT7620 + select CLKSRC_MMIO + select TIMER_OF + help + Enables support for system tick counter present on + Ralink SoCs RT3352 and MT7620. + endmenu diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 22743785299e..c9214afcb712 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -91,3 +91,4 @@ obj-$(CONFIG_GOLDFISH_TIMER) += timer-goldfish.o obj-$(CONFIG_GXP_TIMER) += timer-gxp.o obj-$(CONFIG_CLKSRC_LOONGSON1_PWM) += timer-loongson1-pwm.o obj-$(CONFIG_EP93XX_TIMER) += timer-ep93xx.o +obj-$(CONFIG_CLKSRC_RALINK) += timer-ralink.o diff --git a/drivers/clocksource/timer-ralink.c b/drivers/clocksource/timer-ralink.c new file mode 100644 index 000000000000..6ecdb4228f76 --- /dev/null +++ b/drivers/clocksource/timer-ralink.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Ralink System Tick Counter driver present on RT3352 and MT7620 SoCs. + * + * Copyright (C) 2013 by John Crispin <john@phrozen.org> + */ + +#include <linux/clockchips.h> +#include <linux/clocksource.h> +#include <linux/interrupt.h> +#include <linux/reset.h> +#include <linux/init.h> +#include <linux/time.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> + +#define SYSTICK_FREQ (50 * 1000) + +#define SYSTICK_CONFIG 0x00 +#define SYSTICK_COMPARE 0x04 +#define SYSTICK_COUNT 0x08 + +/* route systick irq to mips irq 7 instead of the r4k-timer */ +#define CFG_EXT_STK_EN 0x2 +/* enable the counter */ +#define CFG_CNT_EN 0x1 + +struct systick_device { + void __iomem *membase; + struct clock_event_device dev; + int irq_requested; + int freq_scale; +}; + +static int systick_set_oneshot(struct clock_event_device *evt); +static int systick_shutdown(struct clock_event_device *evt); + +static int systick_next_event(unsigned long delta, + struct clock_event_device *evt) +{ + struct systick_device *sdev; + u32 count; + + sdev = container_of(evt, struct systick_device, dev); + count = ioread32(sdev->membase + SYSTICK_COUNT); + count = (count + delta) % SYSTICK_FREQ; + iowrite32(count, sdev->membase + SYSTICK_COMPARE); + + return 0; +} + +static void systick_event_handler(struct clock_event_device *dev) +{ + /* noting to do here */ +} + +static irqreturn_t systick_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *dev = (struct clock_event_device *)dev_id; + + dev->event_handler(dev); + + return IRQ_HANDLED; +} + +static struct systick_device systick = { + .dev = { + /* + * cevt-r4k uses 300, make sure systick + * gets used if available + */ + .rating = 310, + .features = CLOCK_EVT_FEAT_ONESHOT, + .set_next_event = systick_next_event, + .set_state_shutdown = systick_shutdown, + .set_state_oneshot = systick_set_oneshot, + .event_handler = systick_event_handler, + }, +}; + +static int systick_shutdown(struct clock_event_device *evt) +{ + struct systick_device *sdev; + + sdev = container_of(evt, struct systick_device, dev); + + if (sdev->irq_requested) + free_irq(systick.dev.irq, &systick.dev); + sdev->irq_requested = 0; + iowrite32(0, systick.membase + SYSTICK_CONFIG); + + return 0; +} + +static int systick_set_oneshot(struct clock_event_device *evt) +{ + const char *name = systick.dev.name; + struct systick_device *sdev; + int irq = systick.dev.irq; + + sdev = container_of(evt, struct systick_device, dev); + + if (!sdev->irq_requested) { + if (request_irq(irq, systick_interrupt, + IRQF_PERCPU | IRQF_TIMER, name, &systick.dev)) + pr_err("Failed to request irq %d (%s)\n", irq, name); + } + sdev->irq_requested = 1; + iowrite32(CFG_EXT_STK_EN | CFG_CNT_EN, + systick.membase + SYSTICK_CONFIG); + + return 0; +} + +static int __init ralink_systick_init(struct device_node *np) +{ + int ret; + + systick.membase = of_iomap(np, 0); + if (!systick.membase) + return -ENXIO; + + systick.dev.name = np->name; + clockevents_calc_mult_shift(&systick.dev, SYSTICK_FREQ, 60); + systick.dev.max_delta_ns = clockevent_delta2ns(0x7fff, &systick.dev); + systick.dev.max_delta_ticks = 0x7fff; + systick.dev.min_delta_ns = clockevent_delta2ns(0x3, &systick.dev); + systick.dev.min_delta_ticks = 0x3; + systick.dev.irq = irq_of_parse_and_map(np, 0); + if (!systick.dev.irq) { + pr_err("%pOFn: request_irq failed", np); + return -EINVAL; + } + + ret = clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name, + SYSTICK_FREQ, 301, 16, + clocksource_mmio_readl_up); + if (ret) + return ret; + + clockevents_register_device(&systick.dev); + + pr_info("%pOFn: running - mult: %d, shift: %d\n", + np, systick.dev.mult, systick.dev.shift); + + return 0; +} + +TIMER_OF_DECLARE(systick, "ralink,cevt-systick", ralink_systick_init);
System Tick Counter is present on Ralink SoCs RT3352 and MT7620. This driver has been in 'arch/mips/ralink' directory since the beggining of Ralink architecture support. However, it can be moved into a more proper place in 'drivers/clocksource'. Hence add it here adding also support for compile test targets. Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> --- drivers/clocksource/Kconfig | 10 ++ drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-ralink.c | 150 +++++++++++++++++++++++++++++ 3 files changed, 161 insertions(+) create mode 100644 drivers/clocksource/timer-ralink.c