Message-ID: <CAJM55Z9_-wKWAby-bAH72AbY9mfSbEnNfaN6_NLvBOys3V3QMA@mail.gmail.com>
Date:   Thu, 3 Aug 2023 13:30:56 +0200
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     Xingyu Wu <xingyu.wu@...rfivetech.com>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Samin Guo <samin.guo@...rfivetech.com>,
        linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v3 2/3] clocksource: Add JH7110 timer driver

On Tue, 27 Jun 2023 at 07:55, Xingyu Wu <xingyu.wu@...rfivetech.com> wrote:
>
> Add timer driver for the StarFive JH7110 SoC.
>
> Signed-off-by: Xingyu Wu <xingyu.wu@...rfivetech.com>
> ---
>  MAINTAINERS                        |   7 +
>  drivers/clocksource/Kconfig        |  11 +
>  drivers/clocksource/Makefile       |   1 +
>  drivers/clocksource/timer-jh7110.c | 485 +++++++++++++++++++++++++++++
>  4 files changed, 504 insertions(+)
>  create mode 100644 drivers/clocksource/timer-jh7110.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6992b7cc7095..4e8e39ae685c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -20125,6 +20125,13 @@ S:     Supported
>  F:     Documentation/devicetree/bindings/mmc/starfive*
>  F:     drivers/mmc/host/dw_mmc-starfive.c
>
> +STARFIVE JH7110 TIMER DRIVER
> +M:     Samin Guo <samin.guo@...rfivetech.com>
> +M:     Xingyu Wu <xingyu.wu@...rfivetech.com>
> +S:     Supported
> +F:     Documentation/devicetree/bindings/timer/starfive,jh7110-timer.yaml
> +F:     drivers/clocksource/timer-jh7110.c
> +
>  STARFIVE JH71X0 CLOCK DRIVERS
>  M:     Emil Renner Berthing <kernel@...il.dk>
>  M:     Hal Feng <hal.feng@...rfivetech.com>
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index 526382dc7482..a1393ec074c0 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -639,6 +639,17 @@ config RISCV_TIMER
>           is accessed via both the SBI and the rdcycle instruction.  This is
>           required for all RISC-V systems.
>
> +config STARFIVE_JH7110_TIMER
> +       bool "Timer for the STARFIVE JH7110 SoC"
> +       depends on ARCH_STARFIVE || COMPILE_TEST
> +       select TIMER_OF
> +       select CLKSRC_MMIO
> +       default ARCH_STARFIVE
> +       help
> +         This enables the timer for StarFive JH7110 SoCs. On RISC-V platform,
> +         the system has started RISCV_TIMER. But you can also use this timer
> +         which can provides four channels to do a lot more on JH7110 SoC.
> +
>  config CLINT_TIMER
>         bool "CLINT Timer for the RISC-V platform" if COMPILE_TEST
>         depends on GENERIC_SCHED_CLOCK && RISCV
> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
> index f12d3987a960..791fb3379f50 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -81,6 +81,7 @@ obj-$(CONFIG_INGENIC_TIMER)           += ingenic-timer.o
>  obj-$(CONFIG_CLKSRC_ST_LPC)            += clksrc_st_lpc.o
>  obj-$(CONFIG_X86_NUMACHIP)             += numachip.o
>  obj-$(CONFIG_RISCV_TIMER)              += timer-riscv.o
> +obj-$(CONFIG_STARFIVE_JH7110_TIMER)    += timer-jh7110.o
>  obj-$(CONFIG_CLINT_TIMER)              += timer-clint.o
>  obj-$(CONFIG_CSKY_MP_TIMER)            += timer-mp-csky.o
>  obj-$(CONFIG_GX6605S_TIMER)            += timer-gx6605s.o
> diff --git a/drivers/clocksource/timer-jh7110.c b/drivers/clocksource/timer-jh7110.c
> new file mode 100644
> index 000000000000..b88334a916fb
> --- /dev/null
> +++ b/drivers/clocksource/timer-jh7110.c
> @@ -0,0 +1,485 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Starfive JH7110 Timer driver
> + *
> + * Copyright (C) 2022 StarFive Technology Co., Ltd.
> + *
> + * Author:
> + * Xingyu Wu <xingyu.wu@...rfivetech.com>
> + * Samin Guo <samin.guo@...rfivetech.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/sched_clock.h>
> +
> +/* Bias: Ch0-0x0, Ch1-0x40, Ch2-0x80, and so on. */
> +#define JH7110_TIMER_CH_LEN            0x40
> +#define JH7110_TIMER_CH_BASE(x)                ((x) * JH7110_TIMER_CH_LEN)
> +
> +#define JH7110_CLOCK_SOURCE_RATING     200
> +#define JH7110_VALID_BITS              32
> +#define JH7110_DELAY_US                        0
> +#define JH7110_TIMEOUT_US              10000
> +#define JH7110_CLOCKEVENT_RATING       300
> +#define JH7110_TIMER_MAX_TICKS         0xffffffff
> +#define JH7110_TIMER_MIN_TICKS         0xf
> +#define JH7110_TIMER_NAME_NUM          20
> +
> +#define JH7110_TIMER_INT_STATUS                0x00 /* RO[0:4]: Interrupt Status for channel0~4 */
> +#define JH7110_TIMER_CTL               0x04 /* RW[0]: 0-continuous run, 1-single run */
> +#define JH7110_TIMER_LOAD              0x08 /* RW: load value to counter */
> +#define JH7110_TIMER_ENABLE            0x10 /* RW[0]: timer enable register */
> +#define JH7110_TIMER_RELOAD            0x14 /* RW: write 1 or 0 both reload counter */
> +#define JH7110_TIMER_VALUE             0x18 /* RO: timer value register */
> +#define JH7110_TIMER_INT_CLR           0x20 /* RW: timer interrupt clear register */
> +#define JH7110_TIMER_INT_MASK          0x24 /* RW[0]: timer interrupt mask register */
> +#define JH7110_TIMER_INT_CLR_AVA_MASK  BIT(1)
> +
> +enum JH7110_TIMER_CH {
> +       JH7110_TIMER_CH_0 = 0,
> +       JH7110_TIMER_CH_1,
> +       JH7110_TIMER_CH_2,
> +       JH7110_TIMER_CH_3,
> +       JH7110_TIMER_CH_MAX
> +};

Usually enum names are not uppercase in kenel code. Also these names
for 0, 1, 2, 3 doesn't really add any value.

> +enum JH7110_TIMER_INTMASK {
> +       JH7110_TIMER_INTMASK_DIS = 0,
> +       JH7110_TIMER_INTMASK_ENA = 1
> +};
> +
> +enum JH7110_TIMER_MOD {
> +       JH7110_TIMER_MOD_CONTIN = 0,
> +       JH7110_TIMER_MOD_SINGLE = 1
> +};
> +
> +enum JH7110_TIMER_CTL_EN {
> +       JH7110_TIMER_DIS = 0,
> +       JH7110_TIMER_ENA = 1
> +};
> +
> +struct jh7110_timer_info {
> +       /* Resgister */
> +       unsigned int ctrl;
> +       unsigned int load;
> +       unsigned int enable;
> +       unsigned int reload;
> +       unsigned int value;
> +       unsigned int intclr;
> +       unsigned int intmask;
> +       unsigned int channel_base[JH7110_TIMER_CH_MAX];
> +};
> +
> +struct jh7110_clkevt {
> +       struct clock_event_device evt;
> +       struct clocksource cs;
> +       struct clk *clk;
> +       char name[JH7110_TIMER_NAME_NUM];
> +       int irq;
> +       u32 periodic;
> +       u32 rate;
> +       u32 reload_val;
> +       void __iomem *base;
> +       void __iomem *ctrl;
> +       void __iomem *load;
> +       void __iomem *enable;
> +       void __iomem *reload;
> +       void __iomem *value;
> +       void __iomem *intclr;
> +       void __iomem *intmask;
> +};
> +
> +struct jh7110_timer_priv {
> +       struct device *dev;
> +       void __iomem *base;
> +       struct jh7110_clkevt clkevt[JH7110_TIMER_CH_MAX];
> +};
> +
> +static const struct jh7110_timer_info jh7110_timer_data = {
> +       .ctrl           = JH7110_TIMER_CTL,
> +       .load           = JH7110_TIMER_LOAD,
> +       .enable         = JH7110_TIMER_ENABLE,
> +       .reload         = JH7110_TIMER_RELOAD,
> +       .value          = JH7110_TIMER_VALUE,
> +       .intclr         = JH7110_TIMER_INT_CLR,
> +       .intmask        = JH7110_TIMER_INT_MASK,
> +       .channel_base   = {JH7110_TIMER_CH_BASE(JH7110_TIMER_CH_0),
> +                          JH7110_TIMER_CH_BASE(JH7110_TIMER_CH_1),
> +                          JH7110_TIMER_CH_BASE(JH7110_TIMER_CH_2),
> +                          JH7110_TIMER_CH_BASE(JH7110_TIMER_CH_3)},
> +};

This driver is specific to the JH7110, so why do you need this level
of abstraction? Can't you just use the register offsets directly?

> +static inline struct jh7110_clkevt *to_jh7110_clkevt(struct clock_event_device *evt)
> +{
> +       return container_of(evt, struct jh7110_clkevt, evt);
> +}
> +
> +/* 0:continuous-run mode, 1:single-run mode */
> +static inline void jh7110_timer_set_mod(struct jh7110_clkevt *clkevt, int mod)
> +{
> +       writel(mod, clkevt->ctrl);
> +}

You have an enum these two choices. Why not use that instead of the
non-specific int type?

> +/* Interrupt Mask Register, 0:Unmask, 1:Mask */
> +static inline void jh7110_timer_int_enable(struct jh7110_clkevt *clkevt)
> +{
> +       writel(JH7110_TIMER_INTMASK_DIS, clkevt->intmask);
> +}
> +
> +static inline void jh7110_timer_int_disable(struct jh7110_clkevt *clkevt)
> +{
> +       writel(JH7110_TIMER_INTMASK_ENA, clkevt->intmask);
> +}
> +
> +/*
> + * BIT(0): Read value represent channel intr status.
> + * Write 1 to this bit to clear interrupt. Write 0 has no effects.
> + * BIT(1): "1" means that it is clearing interrupt. BIT(0) can not be written.
> + */
> +static inline int jh7110_timer_int_clear(struct jh7110_clkevt *clkevt)
> +{
> +       u32 value;
> +       int ret;
> +
> +       /* waiting interrupt can be to clearing */
> +       ret = readl_poll_timeout_atomic(clkevt->intclr, value,
> +                                       !(value & JH7110_TIMER_INT_CLR_AVA_MASK),
> +                                       JH7110_DELAY_US, JH7110_TIMEOUT_US);
> +       if (!ret)
> +               writel(0x1, clkevt->intclr);
> +
> +       return ret;
> +}
> +
> +/*
> + * The initial value to be loaded into the
> + * counter and is also used as the reload value.
> + * val = clock rate --> 1s
> + */
> +static inline void jh7110_timer_set_load(struct jh7110_clkevt *clkevt, u32 val)
> +{
> +       writel(val, clkevt->load);
> +}
> +
> +static inline u32 jh7110_timer_get_val(struct jh7110_clkevt *clkevt)
> +{
> +       return readl(clkevt->value);
> +}

Do these wrappers really add any value? To me this is just as clear:

writel(clkevt->base + JH7110_TIMER_LOAD, val);

Same goes for the wrappers below.

> +/*
> + * Write RELOAD register to reload preset value to counter.
> + * Write 0 and write 1 are both ok.
> + */
> +static inline void jh7110_timer_set_reload(struct jh7110_clkevt *clkevt)
> +{
> +       writel(0, clkevt->reload);
> +}
> +
> +static inline void jh7110_timer_enable(struct jh7110_clkevt *clkevt)
> +{
> +       writel(JH7110_TIMER_ENA, clkevt->enable);
> +}
> +
> +static inline void jh7110_timer_disable(struct jh7110_clkevt *clkevt)
> +{
> +       writel(JH7110_TIMER_DIS, clkevt->enable);
> +}
> +
> +static int jh7110_timer_int_init_enable(struct jh7110_clkevt *clkevt)
> +{
> +       int ret;
> +
> +       jh7110_timer_int_disable(clkevt);
> +       ret = jh7110_timer_int_clear(clkevt);
> +       if (ret)
> +               return ret;
> +
> +       jh7110_timer_int_enable(clkevt);
> +       jh7110_timer_enable(clkevt);
> +
> +       return 0;
> +}
> +
> +static int jh7110_timer_shutdown(struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       jh7110_timer_disable(clkevt);
> +       return jh7110_timer_int_clear(clkevt);
> +}
> +
> +static void jh7110_timer_suspend(struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       clkevt->reload_val = jh7110_timer_get_val(clkevt);
> +       jh7110_timer_shutdown(evt);
> +}
> +
> +static void jh7110_timer_resume(struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       jh7110_timer_set_load(clkevt, clkevt->reload_val);
> +       jh7110_timer_set_reload(clkevt);
> +       jh7110_timer_int_enable(clkevt);
> +       jh7110_timer_enable(clkevt);
> +}
> +
> +static int jh7110_timer_tick_resume(struct clock_event_device *evt)
> +{
> +       jh7110_timer_resume(evt);
> +
> +       return 0;
> +}
> +
> +static u64 jh7110_timer_clocksource_read(struct clocksource *cs)
> +{
> +       struct jh7110_clkevt *clkevt = container_of(cs, struct jh7110_clkevt, cs);
> +
> +       return (u64)jh7110_timer_get_val(clkevt);
> +}
> +
> +static int jh7110_clocksource_init(struct jh7110_clkevt *clkevt)
> +{
> +       int ret;
> +
> +       jh7110_timer_set_mod(clkevt, JH7110_TIMER_MOD_CONTIN);
> +       jh7110_timer_set_load(clkevt, JH7110_TIMER_MAX_TICKS);
> +
> +       ret = jh7110_timer_int_init_enable(clkevt);
> +       if (ret)
> +               return ret;
> +
> +       clkevt->cs.name = clkevt->name;
> +       clkevt->cs.rating = JH7110_CLOCK_SOURCE_RATING;
> +       clkevt->cs.read = jh7110_timer_clocksource_read;
> +       clkevt->cs.mask = CLOCKSOURCE_MASK(JH7110_VALID_BITS);
> +       clkevt->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
> +
> +       return clocksource_register_hz(&clkevt->cs, clkevt->rate);
> +}
> +
> +/* IRQ handler for the timer */
> +static irqreturn_t jh7110_timer_interrupt(int irq, void *priv)
> +{
> +       struct clock_event_device *evt = (struct clock_event_device *)priv;
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       if (jh7110_timer_int_clear(clkevt))
> +               return IRQ_NONE;
> +
> +       if (evt->event_handler)
> +               evt->event_handler(evt);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static int jh7110_timer_set_periodic(struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       clkevt->periodic = DIV_ROUND_CLOSEST(clkevt->rate, HZ);
> +       jh7110_timer_disable(clkevt);
> +       jh7110_timer_set_mod(clkevt, JH7110_TIMER_MOD_CONTIN);
> +       jh7110_timer_set_load(clkevt, clkevt->periodic);
> +
> +       return jh7110_timer_int_init_enable(clkevt);
> +}
> +
> +static int jh7110_timer_set_oneshot(struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       jh7110_timer_disable(clkevt);
> +       jh7110_timer_set_mod(clkevt, JH7110_TIMER_MOD_SINGLE);
> +       jh7110_timer_set_load(clkevt, JH7110_TIMER_MAX_TICKS);
> +
> +       return jh7110_timer_int_init_enable(clkevt);
> +}
> +
> +static int jh7110_timer_set_next_event(unsigned long next,
> +                                      struct clock_event_device *evt)
> +{
> +       struct jh7110_clkevt *clkevt = to_jh7110_clkevt(evt);
> +
> +       jh7110_timer_disable(clkevt);
> +       jh7110_timer_set_mod(clkevt, JH7110_TIMER_MOD_SINGLE);
> +       jh7110_timer_set_load(clkevt, next);
> +       jh7110_timer_enable(clkevt);
> +
> +       return 0;
> +}
> +
> +static void jh7110_set_clockevent(struct clock_event_device *evt)
> +{
> +       evt->features = CLOCK_EVT_FEAT_PERIODIC |
> +                       CLOCK_EVT_FEAT_ONESHOT |
> +                       CLOCK_EVT_FEAT_DYNIRQ;
> +       evt->set_state_shutdown = jh7110_timer_shutdown;
> +       evt->set_state_periodic = jh7110_timer_set_periodic;
> +       evt->set_state_oneshot = jh7110_timer_set_oneshot;
> +       evt->set_state_oneshot_stopped = jh7110_timer_shutdown;
> +       evt->tick_resume = jh7110_timer_tick_resume;
> +       evt->set_next_event = jh7110_timer_set_next_event;
> +       evt->suspend = jh7110_timer_suspend;
> +       evt->resume = jh7110_timer_resume;
> +       evt->rating = JH7110_CLOCKEVENT_RATING;
> +}
> +
> +static void jh7110_clockevents_register(struct jh7110_clkevt *clkevt)
> +{
> +       clkevt->rate = clk_get_rate(clkevt->clk);
> +
> +       jh7110_set_clockevent(&clkevt->evt);
> +       clkevt->evt.name = clkevt->name;
> +       clkevt->evt.irq = clkevt->irq;
> +       clkevt->evt.cpumask = cpu_possible_mask;
> +
> +       clockevents_config_and_register(&clkevt->evt, clkevt->rate,
> +                                       JH7110_TIMER_MIN_TICKS, JH7110_TIMER_MAX_TICKS);
> +}
> +
> +static void jh7110_clkevt_base_init(const struct jh7110_timer_info *data,
> +                                   struct jh7110_clkevt *clkevt,
> +                                   void __iomem *base, int ch)
> +{
> +       void __iomem *channel_base;
> +
> +       channel_base = base + data->channel_base[ch];
> +       clkevt->base = channel_base;
> +       clkevt->ctrl = channel_base + data->ctrl;
> +       clkevt->load = channel_base + data->load;
> +       clkevt->enable = channel_base + data->enable;
> +       clkevt->reload = channel_base + data->reload;
> +       clkevt->value = channel_base + data->value;
> +       clkevt->intclr = channel_base + data->intclr;
> +       clkevt->intmask = channel_base + data->intmask;
> +}
> +
> +static int jh7110_timer_probe(struct platform_device *pdev)
> +{
> +       const struct jh7110_timer_info *data = of_device_get_match_data(&pdev->dev);
> +       char name[JH7110_TIMER_NAME_NUM];
> +       struct jh7110_timer_priv *priv;
> +       struct jh7110_clkevt *clkevt;
> +       struct clk *pclk;
> +       struct reset_control *rst;
> +       int ch;
> +       int ret;
> +
> +       if (!data)
> +               return -ENOENT;
> +
> +       priv = devm_kzalloc(&pdev->dev, struct_size(priv, clkevt, JH7110_TIMER_CH_MAX),
> +                           GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       priv->base = devm_platform_ioremap_resource(pdev, 0);
> +       if (IS_ERR(priv->base))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(priv->base),
> +                                    "failed to map registers\n");
> +
> +       rst = devm_reset_control_get_exclusive(&pdev->dev, "apb");
> +       if (IS_ERR(rst))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(rst), "failed to get apb reset\n");
> +
> +       pclk = devm_clk_get_enabled(&pdev->dev, "apb");
> +       if (IS_ERR(pclk))
> +               return dev_err_probe(&pdev->dev, PTR_ERR(pclk),
> +                                    "failed to get & enable apb clock\n");
> +
> +       ret = reset_control_deassert(rst);
> +       if (ret)
> +               goto err;

You get and enable the clocks with devm_clk_get_enabled(), so they
will be automatically disabled and put when the driver is unloaded, so
why do you need the explicit call to clk_disable_unprepare() below?

> +
> +       priv->dev = &pdev->dev;
> +       platform_set_drvdata(pdev, priv);
> +
> +       for (ch = 0; ch < JH7110_TIMER_CH_MAX; ch++) {
> +               clkevt = &priv->clkevt[ch];
> +               snprintf(name, sizeof(name), "ch%d", ch);
> +
> +               jh7110_clkevt_base_init(data, clkevt, priv->base, ch);
> +               /* Ensure timers are disabled */
> +               jh7110_timer_disable(clkevt);
> +
> +               rst = devm_reset_control_get_exclusive(&pdev->dev, name);
> +               if (IS_ERR(rst)) {
> +                       ret = PTR_ERR(rst);
> +                       goto err;
> +               }
> +
> +               clkevt->clk = devm_clk_get_enabled(&pdev->dev, name);
> +               if (IS_ERR(clkevt->clk)) {
> +                       ret = PTR_ERR(clkevt->clk);
> +                       goto err;
> +               }
> +
> +               ret = reset_control_deassert(rst);
> +               if (ret)
> +                       goto ch_err;
> +
> +               clkevt->irq = platform_get_irq(pdev, ch);
> +               if (clkevt->irq < 0) {
> +                       ret = clkevt->irq;
> +                       goto ch_err;
> +               }
> +
> +               snprintf(clkevt->name, sizeof(clkevt->name), "%s.ch%d", pdev->name, ch);
> +               jh7110_clockevents_register(clkevt);
> +
> +               ret = devm_request_irq(&pdev->dev, clkevt->irq, jh7110_timer_interrupt,
> +                                      IRQF_TIMER | IRQF_IRQPOLL,
> +                                      clkevt->name, &clkevt->evt);
> +               if (ret)
> +                       goto ch_err;
> +
> +               ret = jh7110_clocksource_init(clkevt);
> +               if (ret)
> +                       goto ch_err;
> +       }
> +
> +       return 0;
> +
> +ch_err:
> +       for (; ch < 0; ch--)
> +               clk_disable_unprepare(priv->clkevt[ch].clk);
> +err:
> +       clk_disable_unprepare(pclk);
> +
> +       return ret;
> +}
> +
> +static const struct of_device_id jh7110_timer_match[] = {
> +       { .compatible = "starfive,jh7110-timer", .data = &jh7110_timer_data },

This driver only works on the JH7110, so why do you need this match data?

> +       { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, jh7110_timer_match);
> +
> +static struct platform_driver jh7110_timer_driver = {
> +       .probe = jh7110_timer_probe,
> +       .driver = {
> +               .name = "jh7110-timer",
> +               .of_match_table = jh7110_timer_match,
> +       },
> +};
> +module_platform_driver(jh7110_timer_driver);
> +
> +MODULE_AUTHOR("Xingyu Wu <xingyu.wu@...rfivetech.com>");
> +MODULE_DESCRIPTION("StarFive JH7110 timer driver");
> +MODULE_LICENSE("GPL");
> --
> 2.17.1
>
>
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