Re: [PATCH v3 07/12] clk: rp1: Add support for clocks provided by RP1

[Andrea della Porta <andrea.porta@suse.com>]

Hi Stephen,

On 15:20 Mon 28 Oct     , Stephen Boyd wrote:
> Quoting Andrea della Porta (2024-10-28 07:07:24)
> > diff --git a/drivers/clk/clk-rp1.c b/drivers/clk/clk-rp1.c
> > new file mode 100644
> > index 000000000000..69b9cf037cb2
> > --- /dev/null
> [...]
> > +
> > +struct rp1_clockman {
> > +       struct device *dev;
> > +       void __iomem *regs;
> 
> Do you still need this if there's a regmap?

Unfortunately the clk_divider registered in rp1_register_pll_divider()
mandates the use of a MMIO registeri, and yes, the divider and teh other
clock shares some registers. AFAICT there were attempts to upstream generic
regmap support for clk_divider, but right now there are just custom
implementations (e.g. drivers/clk/qcom/clk-regmap.c).  So, in order to
use regmap, that clock divider shoulf be first augmented with regmap
support. Please let me know if you think it's worth the effort.

> 
> > +       struct regmap *regmap;
> > +       spinlock_t regs_lock; /* spinlock for all clocks */
> 
> Do you need this or is the spinlock in the regmap sufficient?

The original code wrapped multiple registers write/read inside the spinlock,
so I suspect that using the internal regmap spinlock for each single
transaciton (so to open up for interleaved register access, although I have
no evidence of that) could have side-effects so I would prefer to stay safe
and manage the lock from outside. I could easily use regmap_multi_reg_write()
and friends to synchronize access across multiple registers but then we would
have the problem above about missing regmap support in clk_divider, since now
it's solved by passing the same spinlock to it too. I'm open to alternatives
here...

> 
> > +
> > +       /* Must be last */
> > +       struct clk_hw_onecell_data onecell;
> > +};
> > +
> > +struct rp1_pll_core_data {
> > +       const char *name;
> 
> These 'name' members can move to clk_init_data?

You've read my mind, I was exactly planning that for the next revision

> 
> > +       u32 cs_reg;
> > +       u32 pwr_reg;
> > +       u32 fbdiv_int_reg;
> > +       u32 fbdiv_frac_reg;
> > +       unsigned long flags;
> 
> And probably flags as well? It seems like clk_init_data should be
> declared at the same time as struct rp1_pll_core_data is.

Ditto.

> 
> > +       u32 fc0_src;
> > +};
> > +
> > +struct rp1_pll_data {
> > +       const char *name;
> > +       u32 ctrl_reg;
> > +       unsigned long flags;
> > +       u32 fc0_src;
> > +};
> > +
> > +struct rp1_pll_ph_data {
> > +       const char *name;
> > +       unsigned int phase;
> > +       unsigned int fixed_divider;
> > +       u32 ph_reg;
> > +       unsigned long flags;
> > +       u32 fc0_src;
> > +};
> > +
> > +struct rp1_pll_divider_data {
> > +       const char *name;
> > +       u32 sec_reg;
> > +       unsigned long flags;
> > +       u32 fc0_src;
> > +};
> > +
> > +struct rp1_clock_data {
> > +       const char *name;
> > +       int num_std_parents;
> > +       int num_aux_parents;
> > +       unsigned long flags;
> > +       u32 oe_mask;
> > +       u32 clk_src_mask;
> > +       u32 ctrl_reg;
> > +       u32 div_int_reg;
> > +       u32 div_frac_reg;
> > +       u32 sel_reg;
> > +       u32 div_int_max;
> > +       unsigned long max_freq;
> > +       u32 fc0_src;
> > +};
> > +
> > +struct rp1_clk_desc {
> > +       struct clk_hw *(*clk_register)(struct rp1_clockman *clockman,
> > +                                      struct rp1_clk_desc *desc);
> > +       const void *data;
> > +       struct clk_hw hw;
> > +       struct rp1_clockman *clockman;
> > +       unsigned long cached_rate;
> > +       struct clk_divider div;
> > +};
> > +
> > +#define FIELD_SET(_reg, _mask, _val)           \
> > +do {                                           \
> > +       u32 mask = (_mask);                     \
> > +       (_reg) &= ~mask;                        \
> > +       (_reg) |= FIELD_PREP(mask, (_val));     \
> 
> Please just write
> 
> 	reg &= ~mask
> 	reg |= FIELD_PREP(mask, val);
> 
> instead of using this macro.

Ack.

> 
> > +} while (0)
> > +
> > +
> [...]
> > +
> > +static struct clk_hw *rp1_register_pll_core(struct rp1_clockman *clockman,
> > +                                           struct rp1_clk_desc *desc)
> > +{
> > +       const struct rp1_pll_core_data *pll_core_data = desc->data;
> > +       struct clk_init_data init = { };
> > +       int ret;
> > +
> > +       /* All of the PLL cores derive from the external oscillator. */
> > +       init.parent_data = desc->hw.init->parent_data;
> > +       init.num_parents = desc->hw.init->num_parents;
> > +       init.name = pll_core_data->name;
> > +       init.ops = &rp1_pll_core_ops;
> > +       init.flags = pll_core_data->flags | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL;
> > +
> > +       desc->clockman = clockman;
> > +       desc->hw.init = &init;
> > +
> > +       ret = devm_clk_hw_register(clockman->dev, &desc->hw);
> > +
> > +       if (ret)
> > +               return ERR_PTR(ret);
> > +
> > +       return &desc->hw;
> > +}
> > +
> > +static struct clk_hw *rp1_register_pll(struct rp1_clockman *clockman,
> > +                                      struct rp1_clk_desc *desc)
> > +{
> > +       const struct rp1_pll_data *pll_data = desc->data;
> > +       struct clk_init_data init = { };
> > +       int ret;
> > +
> > +       init.parent_data = desc->hw.init->parent_data;
> > +       init.num_parents = desc->hw.init->num_parents;
> > +       init.name = pll_data->name;
> > +       init.ops = &rp1_pll_ops;
> > +       init.flags = pll_data->flags | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL;
> > +
> > +       desc->clockman = clockman;
> > +       desc->hw.init = &init;
> > +
> > +       ret = devm_clk_hw_register(clockman->dev, &desc->hw);
> > +
> > +       if (ret)
> > +               return ERR_PTR(ret);
> > +
> > +       return &desc->hw;
> > +}
> > +
> > +static struct clk_hw *rp1_register_pll_ph(struct rp1_clockman *clockman,
> > +                                         struct rp1_clk_desc *desc)
> > +{
> > +       const struct rp1_pll_ph_data *ph_data = desc->data;
> > +       struct clk_init_data init = { };
> > +       int ret;
> > +
> > +       init.parent_data = desc->hw.init->parent_data;
> > +       init.num_parents = desc->hw.init->num_parents;
> > +       init.name = ph_data->name;
> > +       init.ops = &rp1_pll_ph_ops;
> > +       init.flags = ph_data->flags | CLK_IGNORE_UNUSED;
> > +
> > +       desc->clockman = clockman;
> > +       desc->hw.init = &init;
> > +
> > +       ret = devm_clk_hw_register(clockman->dev, &desc->hw);
> > +
> > +       if (ret)
> > +               return ERR_PTR(ret);
> > +
> > +       return &desc->hw;
> > +}
> > +
> > +static struct clk_hw *rp1_register_pll_divider(struct rp1_clockman *clockman,
> > +                                              struct rp1_clk_desc *desc)
> > +{
> > +       const struct rp1_pll_data *divider_data = desc->data;
> > +       struct clk_init_data init = { };
> > +       int ret;
> > +
> > +       init.parent_data = desc->hw.init->parent_data;
> > +       init.num_parents = desc->hw.init->num_parents;
> > +       init.name = divider_data->name;
> > +       init.ops = &rp1_pll_divider_ops;
> > +       init.flags = divider_data->flags | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL;
> > +
> > +       desc->div.reg = clockman->regs + divider_data->ctrl_reg;
> 
> Why is 'regs' used here? Isn't everything using a regmap now so it's all
> offsets?

Already explained above.

> 
> > +       desc->div.shift = PLL_SEC_DIV_SHIFT;
> > +       desc->div.width = PLL_SEC_DIV_WIDTH;
> > +       desc->div.flags = CLK_DIVIDER_ROUND_CLOSEST;
> > +       desc->div.flags |= CLK_IS_CRITICAL;
> > +       desc->div.lock = &clockman->regs_lock;
> > +       desc->div.hw.init = &init;
> > +       desc->div.table = pll_sec_div_table;
> > +
> > +       desc->clockman = clockman;
> > +
> > +       ret = devm_clk_hw_register(clockman->dev, &desc->div.hw);
> > +
> > +       if (ret)
> > +               return ERR_PTR(ret);
> > +
> > +       return &desc->div.hw;
> > +}
> > +
> > +static struct clk_hw *rp1_register_clock(struct rp1_clockman *clockman,
> > +                                        struct rp1_clk_desc *desc)
> > +{
> > +       const struct rp1_clock_data *clock_data = desc->data;
> > +       struct clk_init_data init = { };
> > +       int ret;
> > +
> > +       if (WARN_ON_ONCE(MAX_CLK_PARENTS <
> > +              clock_data->num_std_parents + clock_data->num_aux_parents))
> > +               return NULL;
> > +
> > +       /* There must be a gap for the AUX selector */
> > +       if (WARN_ON_ONCE(clock_data->num_std_parents > AUX_SEL &&
> > +                        desc->hw.init->parent_data[AUX_SEL].index != -1))
> > +               return NULL;
> > +
> > +       init.parent_data = desc->hw.init->parent_data;
> > +       init.num_parents = desc->hw.init->num_parents;
> > +       init.name = clock_data->name;
> > +       init.flags = clock_data->flags | CLK_IGNORE_UNUSED;
> > +       init.ops = &rp1_clk_ops;
> > +
> > +       desc->clockman = clockman;
> > +       desc->hw.init = &init;
> > +
> > +       ret = devm_clk_hw_register(clockman->dev, &desc->hw);
> > +
> > +       if (ret)
> > +               return ERR_PTR(ret);
> > +
> > +       return &desc->hw;
> > +}
> > +
> > +/* Assignment helper macros for different clock types. */
> > +#define _REGISTER(f, ...)      { .clk_register = f, __VA_ARGS__ }
> > +
> > +#define PARENT_CLK(pnum, ...)  .hw.init = &(const struct clk_init_data) { \
> 
> Instead of this macro just use CLK_HW_INIT_HW() or
> CLK_HW_INIT_PARENTS_DATA()?

Ack.

> 
> > +                               .parent_data = (const struct               \
> > +                                               clk_parent_data[]) {       \
> > +                                                       __VA_ARGS__        \
> > +                                               },                         \
> > +                               .num_parents = pnum }
> > +
> > +#define CLK_DATA(type, ...)    .data = &(struct type) { __VA_ARGS__ }
> > +
> > +#define REGISTER_PLL_CORE(...) _REGISTER(&rp1_register_pll_core,       \
> > +                                         __VA_ARGS__)
> > +
> > +#define REGISTER_PLL(...)      _REGISTER(&rp1_register_pll,            \
> > +                                         __VA_ARGS__)
> > +
> > +#define REGISTER_PLL_PH(...)   _REGISTER(&rp1_register_pll_ph,         \
> > +                                         __VA_ARGS__)
> > +
> > +#define REGISTER_PLL_DIV(...)  _REGISTER(&rp1_register_pll_divider,    \
> > +                                         __VA_ARGS__)
> > +
> > +#define REGISTER_CLK(...)      _REGISTER(&rp1_register_clock,          \
> > +                                         __VA_ARGS__)
> > +
> > +static struct rp1_clk_desc clk_desc_array[] = {
> > +       [RP1_PLL_SYS_CORE] = REGISTER_PLL_CORE(PARENT_CLK(1, { .index = 0 }),
> > +                               CLK_DATA(rp1_pll_core_data,
> > +                                        .name = "pll_sys_core",
> > +                                        .cs_reg = PLL_SYS_CS,
> > +                                        .pwr_reg = PLL_SYS_PWR,
> > +                                        .fbdiv_int_reg = PLL_SYS_FBDIV_INT,
> > +                                        .fbdiv_frac_reg = PLL_SYS_FBDIV_FRAC,
> > +                               )),
> > +
> > +       [RP1_PLL_AUDIO_CORE] = REGISTER_PLL_CORE(PARENT_CLK(1, { .index = 0 }),
> > +                               CLK_DATA(rp1_pll_core_data,
> > +                                        .name = "pll_audio_core",
> > +                                        .cs_reg = PLL_AUDIO_CS,
> > +                                        .pwr_reg = PLL_AUDIO_PWR,
> > +                                        .fbdiv_int_reg = PLL_AUDIO_FBDIV_INT,
> > +                                        .fbdiv_frac_reg = PLL_AUDIO_FBDIV_FRAC,
> > +                               )),
> > +
> > +       [RP1_PLL_VIDEO_CORE] = REGISTER_PLL_CORE(PARENT_CLK(1, { .index = 0 }),
> > +                               CLK_DATA(rp1_pll_core_data,
> > +                                        .name = "pll_video_core",
> > +                                        .cs_reg = PLL_VIDEO_CS,
> > +                                        .pwr_reg = PLL_VIDEO_PWR,
> > +                                        .fbdiv_int_reg = PLL_VIDEO_FBDIV_INT,
> > +                                        .fbdiv_frac_reg = PLL_VIDEO_FBDIV_FRAC,
> > +                               )),
> > +
> > +       [RP1_PLL_SYS] = REGISTER_PLL(PARENT_CLK(1,
> > +                               { .hw = &clk_desc_array[RP1_PLL_SYS_CORE].hw }
> > +                               ),
> > +                               CLK_DATA(rp1_pll_data,
> > +                                        .name = "pll_sys",
> > +                                        .ctrl_reg = PLL_SYS_PRIM,
> > +                                        .fc0_src = FC_NUM(0, 2),
> > +                               )),
> > +
> > +       [RP1_CLK_ETH_TSU] = REGISTER_CLK(PARENT_CLK(1, { .index = 0 }),
> > +                               CLK_DATA(rp1_clock_data,
> > +                                        .name = "clk_eth_tsu",
> > +                                        .num_std_parents = 0,
> > +                                        .num_aux_parents = 1,
> > +                                        .ctrl_reg = CLK_ETH_TSU_CTRL,
> > +                                        .div_int_reg = CLK_ETH_TSU_DIV_INT,
> > +                                        .sel_reg = CLK_ETH_TSU_SEL,
> > +                                        .div_int_max = DIV_INT_8BIT_MAX,
> > +                                        .max_freq = 50 * HZ_PER_MHZ,
> > +                                        .fc0_src = FC_NUM(5, 7),
> > +                               )),
> > +
> > +       [RP1_CLK_SYS] = REGISTER_CLK(PARENT_CLK(3,
> > +                               { .index = 0 },
> > +                               { .index = -1 },
> > +                               { .hw = &clk_desc_array[RP1_PLL_SYS].hw }
> > +                               ),
> > +                               CLK_DATA(rp1_clock_data,
> > +                                        .name = "clk_sys",
> > +                                        .num_std_parents = 3,
> > +                                        .num_aux_parents = 0,
> > +                                        .ctrl_reg = CLK_SYS_CTRL,
> > +                                        .div_int_reg = CLK_SYS_DIV_INT,
> > +                                        .sel_reg = CLK_SYS_SEL,
> > +                                        .div_int_max = DIV_INT_24BIT_MAX,
> > +                                        .max_freq = 200 * HZ_PER_MHZ,
> > +                                        .fc0_src = FC_NUM(0, 4),
> > +                                        .clk_src_mask = 0x3,
> > +                               )),
> > +
> > +       [RP1_PLL_SYS_PRI_PH] = REGISTER_PLL_PH(PARENT_CLK(1,
> > +                               { .hw = &clk_desc_array[RP1_PLL_SYS].hw }
> > +                               ),
> > +                               CLK_DATA(rp1_pll_ph_data,
> > +                                        .name = "pll_sys_pri_ph",
> > +                                        .ph_reg = PLL_SYS_PRIM,
> > +                                        .fixed_divider = 2,
> > +                                        .phase = RP1_PLL_PHASE_0,
> > +                                        .fc0_src = FC_NUM(1, 2),
> > +                               )),
> > +
> > +       [RP1_PLL_SYS_SEC] = REGISTER_PLL_DIV(PARENT_CLK(1,
> > +                               { .hw = &clk_desc_array[RP1_PLL_SYS_CORE].hw }
> > +                               ),
> > +                               CLK_DATA(rp1_pll_data,
> > +                                        .name = "pll_sys_sec",
> > +                                        .ctrl_reg = PLL_SYS_SEC,
> > +                                        .fc0_src = FC_NUM(2, 2),
> > +                               )),
> > +};
> > +
> > +static const struct regmap_range rp1_reg_ranges[] = {
> > +       regmap_reg_range(PLL_SYS_CS, PLL_SYS_SEC),
> > +       regmap_reg_range(PLL_AUDIO_CS, PLL_AUDIO_TERN),
> > +       regmap_reg_range(PLL_VIDEO_CS, PLL_VIDEO_SEC),
> > +       regmap_reg_range(GPCLK_OE_CTRL, GPCLK_OE_CTRL),
> > +       regmap_reg_range(CLK_SYS_CTRL, CLK_SYS_DIV_INT),
> > +       regmap_reg_range(CLK_SYS_SEL, CLK_SYS_SEL),
> > +       regmap_reg_range(CLK_SLOW_SYS_CTRL, CLK_SLOW_SYS_DIV_INT),
> > +       regmap_reg_range(CLK_SLOW_SYS_SEL, CLK_SLOW_SYS_SEL),
> > +       regmap_reg_range(CLK_DMA_CTRL, CLK_DMA_DIV_INT),
> > +       regmap_reg_range(CLK_DMA_SEL, CLK_DMA_SEL),
> > +       regmap_reg_range(CLK_UART_CTRL, CLK_UART_DIV_INT),
> > +       regmap_reg_range(CLK_UART_SEL, CLK_UART_SEL),
> > +       regmap_reg_range(CLK_ETH_CTRL, CLK_ETH_DIV_INT),
> > +       regmap_reg_range(CLK_ETH_SEL, CLK_ETH_SEL),
> > +       regmap_reg_range(CLK_PWM0_CTRL, CLK_PWM0_SEL),
> > +       regmap_reg_range(CLK_PWM1_CTRL, CLK_PWM1_SEL),
> > +       regmap_reg_range(CLK_AUDIO_IN_CTRL, CLK_AUDIO_IN_DIV_INT),
> > +       regmap_reg_range(CLK_AUDIO_IN_SEL, CLK_AUDIO_IN_SEL),
> > +       regmap_reg_range(CLK_AUDIO_OUT_CTRL, CLK_AUDIO_OUT_DIV_INT),
> > +       regmap_reg_range(CLK_AUDIO_OUT_SEL, CLK_AUDIO_OUT_SEL),
> > +       regmap_reg_range(CLK_I2S_CTRL, CLK_I2S_DIV_INT),
> > +       regmap_reg_range(CLK_I2S_SEL, CLK_I2S_SEL),
> > +       regmap_reg_range(CLK_MIPI0_CFG_CTRL, CLK_MIPI0_CFG_DIV_INT),
> > +       regmap_reg_range(CLK_MIPI0_CFG_SEL, CLK_MIPI0_CFG_SEL),
> > +       regmap_reg_range(CLK_MIPI1_CFG_CTRL, CLK_MIPI1_CFG_DIV_INT),
> > +       regmap_reg_range(CLK_MIPI1_CFG_SEL, CLK_MIPI1_CFG_SEL),
> > +       regmap_reg_range(CLK_PCIE_AUX_CTRL, CLK_PCIE_AUX_DIV_INT),
> > +       regmap_reg_range(CLK_PCIE_AUX_SEL, CLK_PCIE_AUX_SEL),
> > +       regmap_reg_range(CLK_USBH0_MICROFRAME_CTRL, CLK_USBH0_MICROFRAME_DIV_INT),
> > +       regmap_reg_range(CLK_USBH0_MICROFRAME_SEL, CLK_USBH0_MICROFRAME_SEL),
> > +       regmap_reg_range(CLK_USBH1_MICROFRAME_CTRL, CLK_USBH1_MICROFRAME_DIV_INT),
> > +       regmap_reg_range(CLK_USBH1_MICROFRAME_SEL, CLK_USBH1_MICROFRAME_SEL),
> > +       regmap_reg_range(CLK_USBH0_SUSPEND_CTRL, CLK_USBH0_SUSPEND_DIV_INT),
> > +       regmap_reg_range(CLK_USBH0_SUSPEND_SEL, CLK_USBH0_SUSPEND_SEL),
> > +       regmap_reg_range(CLK_USBH1_SUSPEND_CTRL, CLK_USBH1_SUSPEND_DIV_INT),
> > +       regmap_reg_range(CLK_USBH1_SUSPEND_SEL, CLK_USBH1_SUSPEND_SEL),
> > +       regmap_reg_range(CLK_ETH_TSU_CTRL, CLK_ETH_TSU_DIV_INT),
> > +       regmap_reg_range(CLK_ETH_TSU_SEL, CLK_ETH_TSU_SEL),
> > +       regmap_reg_range(CLK_ADC_CTRL, CLK_ADC_DIV_INT),
> > +       regmap_reg_range(CLK_ADC_SEL, CLK_ADC_SEL),
> > +       regmap_reg_range(CLK_SDIO_TIMER_CTRL, CLK_SDIO_TIMER_DIV_INT),
> > +       regmap_reg_range(CLK_SDIO_TIMER_SEL, CLK_SDIO_TIMER_SEL),
> > +       regmap_reg_range(CLK_SDIO_ALT_SRC_CTRL, CLK_SDIO_ALT_SRC_DIV_INT),
> > +       regmap_reg_range(CLK_SDIO_ALT_SRC_SEL, CLK_SDIO_ALT_SRC_SEL),
> > +       regmap_reg_range(CLK_GP0_CTRL, CLK_GP0_SEL),
> > +       regmap_reg_range(CLK_GP1_CTRL, CLK_GP1_SEL),
> > +       regmap_reg_range(CLK_GP2_CTRL, CLK_GP2_SEL),
> > +       regmap_reg_range(CLK_GP3_CTRL, CLK_GP3_SEL),
> > +       regmap_reg_range(CLK_GP4_CTRL, CLK_GP4_SEL),
> > +       regmap_reg_range(CLK_GP5_CTRL, CLK_GP5_SEL),
> > +       regmap_reg_range(CLK_SYS_RESUS_CTRL, CLK_SYS_RESUS_CTRL),
> > +       regmap_reg_range(CLK_SLOW_SYS_RESUS_CTRL, CLK_SLOW_SYS_RESUS_CTRL),
> > +       regmap_reg_range(FC0_REF_KHZ, FC0_RESULT),
> > +       regmap_reg_range(VIDEO_CLK_VEC_CTRL, VIDEO_CLK_VEC_DIV_INT),
> > +       regmap_reg_range(VIDEO_CLK_VEC_SEL, VIDEO_CLK_DPI_DIV_INT),
> > +       regmap_reg_range(VIDEO_CLK_DPI_SEL, VIDEO_CLK_MIPI1_DPI_SEL),
> > +};
> > +
> > +static const struct regmap_access_table rp1_reg_table = {
> > +       .yes_ranges = rp1_reg_ranges,
> > +       .n_yes_ranges = ARRAY_SIZE(rp1_reg_ranges),
> > +};
> > +
> > +static const struct regmap_config rp1_clk_regmap_cfg = {
> > +       .reg_bits = 32,
> > +       .val_bits = 32,
> > +       .reg_stride = 4,
> > +       .max_register = PLL_VIDEO_SEC,
> > +       .name = "rp1-clk",
> > +       .rd_table = &rp1_reg_table,
> > +};
> > +
> > +static int rp1_clk_probe(struct platform_device *pdev)
> > +{
> > +       const size_t asize = ARRAY_SIZE(clk_desc_array);
> > +       struct rp1_clk_desc *desc;
> > +       struct device *dev = &pdev->dev;
> > +       struct rp1_clockman *clockman;
> > +       struct clk_hw **hws;
> > +       unsigned int i;
> > +
> > +       clockman = devm_kzalloc(dev, struct_size(clockman, onecell.hws, asize),
> > +                               GFP_KERNEL);
> > +       if (!clockman)
> > +               return -ENOMEM;
> > +
> > +       spin_lock_init(&clockman->regs_lock);
> > +       clockman->dev = dev;
> > +
> > +       clockman->regs = devm_platform_ioremap_resource(pdev, 0);
> > +       if (IS_ERR(clockman->regs))
> > +               return PTR_ERR(clockman->regs);
> > +
> > +       clockman->regmap = devm_regmap_init_mmio(dev, clockman->regs,
> > +                                                &rp1_clk_regmap_cfg);
> > +       if (IS_ERR(clockman->regmap)) {
> > +               dev_err(dev, "could not init clock regmap\n");
> 
> return dev_err_probe()?

Ack.

Many thanks,
Andrea

> 
> > +               return PTR_ERR(clockman->regmap);
> > +       }
> > +
> > +       clockman->onecell.num = asize;
> > +       hws = clockman->onecell.hws;
> > +
> > +       for (i = 0; i < asize; i++) {
> > +               desc = &clk_desc_array[i];
> > +               if (desc->clk_register && desc->data) {
> > +                       hws[i] = desc->clk_register(clockman, desc);
> > +                       if (IS_ERR_OR_NULL(hws[i]))
> > +                               dev_err_probe(dev, PTR_ERR(hws[i]),
> > +                                             "Unable to register clock: %s\n",
> > +                                             clk_hw_get_name(hws[i]));
> > +               }
> > +       }
> > +
> > +       platform_set_drvdata(pdev, clockman);
> > +
> > +       return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> > +                                          &clockman->onecell);
> > +}