Re: [PATCH v1 3/7] soc: starfive: Modify ioremap to regmap

[Conor Dooley <conor@kernel.org>]

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On Mon, Apr 10, 2023 at 11:47:39PM -0700, Changhuang Liang wrote:
> Modify ioremap to regmap, easy to simplify code.

This doesn't simplify anything, adding regmap to the mix actually makes
it less obvious what is going on here & it's not even fewer LoC:
1 file changed, 23 insertions(+), 20 deletions(-)

Please write a commit message that explains the real motivation for
this change.

Thanks,
Conor.

> 
> Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
> ---
>  drivers/soc/starfive/jh71xx_pmu.c | 43 +++++++++++++++++--------------
>  1 file changed, 23 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/soc/starfive/jh71xx_pmu.c b/drivers/soc/starfive/jh71xx_pmu.c
> index 7d5f50d71c0d..306218c83691 100644
> --- a/drivers/soc/starfive/jh71xx_pmu.c
> +++ b/drivers/soc/starfive/jh71xx_pmu.c
> @@ -6,13 +6,13 @@
>   */
>  
>  #include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/iopoll.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
> +#include <linux/regmap.h>
>  #include <dt-bindings/power/starfive,jh7110-pmu.h>
>  
>  /* register offset */
> @@ -59,7 +59,7 @@ struct jh71xx_pmu_match_data {
>  struct jh71xx_pmu {
>  	struct device *dev;
>  	const struct jh71xx_pmu_match_data *match_data;
> -	void __iomem *base;
> +	struct regmap *base;
>  	struct generic_pm_domain **genpd;
>  	struct genpd_onecell_data genpd_data;
>  	int irq;
> @@ -75,11 +75,14 @@ struct jh71xx_pmu_dev {
>  static int jh71xx_pmu_get_state(struct jh71xx_pmu_dev *pmd, u32 mask, bool *is_on)
>  {
>  	struct jh71xx_pmu *pmu = pmd->pmu;
> +	unsigned int val;
>  
>  	if (!mask)
>  		return -EINVAL;
>  
> -	*is_on = readl(pmu->base + JH71XX_PMU_CURR_POWER_MODE) & mask;
> +	regmap_read(pmu->base, JH71XX_PMU_CURR_POWER_MODE, &val);
> +
> +	*is_on = val & mask;
>  
>  	return 0;
>  }
> @@ -130,7 +133,7 @@ static int jh71xx_pmu_set_state(struct jh71xx_pmu_dev *pmd, u32 mask, bool on)
>  		encourage_hi = JH71XX_PMU_SW_ENCOURAGE_DIS_HI;
>  	}
>  
> -	writel(mask, pmu->base + mode);
> +	regmap_write(pmu->base, mode, mask);
>  
>  	/*
>  	 * 2.Write SW encourage command sequence to the Software Encourage Reg (offset 0x44)
> @@ -140,21 +143,21 @@ static int jh71xx_pmu_set_state(struct jh71xx_pmu_dev *pmd, u32 mask, bool on)
>  	 *   Then write the lower bits of the command sequence, followed by the upper
>  	 *   bits. The sequence differs between powering on & off a domain.
>  	 */
> -	writel(JH71XX_PMU_SW_ENCOURAGE_ON, pmu->base + JH71XX_PMU_SW_ENCOURAGE);
> -	writel(encourage_lo, pmu->base + JH71XX_PMU_SW_ENCOURAGE);
> -	writel(encourage_hi, pmu->base + JH71XX_PMU_SW_ENCOURAGE);
> +	regmap_write(pmu->base, JH71XX_PMU_SW_ENCOURAGE, JH71XX_PMU_SW_ENCOURAGE_ON);
> +	regmap_write(pmu->base, JH71XX_PMU_SW_ENCOURAGE, encourage_lo);
> +	regmap_write(pmu->base, JH71XX_PMU_SW_ENCOURAGE, encourage_hi);
>  
>  	spin_unlock_irqrestore(&pmu->lock, flags);
>  
>  	/* Wait for the power domain bit to be enabled / disabled */
>  	if (on) {
> -		ret = readl_poll_timeout_atomic(pmu->base + JH71XX_PMU_CURR_POWER_MODE,
> -						val, val & mask,
> -						1, JH71XX_PMU_TIMEOUT_US);
> +		ret = regmap_read_poll_timeout_atomic(pmu->base, JH71XX_PMU_CURR_POWER_MODE,
> +						      val, val & mask,
> +						      1, JH71XX_PMU_TIMEOUT_US);
>  	} else {
> -		ret = readl_poll_timeout_atomic(pmu->base + JH71XX_PMU_CURR_POWER_MODE,
> -						val, !(val & mask),
> -						1, JH71XX_PMU_TIMEOUT_US);
> +		ret = regmap_read_poll_timeout_atomic(pmu->base, JH71XX_PMU_CURR_POWER_MODE,
> +						      val, !(val & mask),
> +						      1, JH71XX_PMU_TIMEOUT_US);
>  	}
>  
>  	if (ret) {
> @@ -190,14 +193,14 @@ static void jh71xx_pmu_int_enable(struct jh71xx_pmu *pmu, u32 mask, bool enable)
>  	unsigned long flags;
>  
>  	spin_lock_irqsave(&pmu->lock, flags);
> -	val = readl(pmu->base + JH71XX_PMU_TIMER_INT_MASK);
> +	regmap_read(pmu->base, JH71XX_PMU_TIMER_INT_MASK, &val);
>  
>  	if (enable)
>  		val &= ~mask;
>  	else
>  		val |= mask;
>  
> -	writel(val, pmu->base + JH71XX_PMU_TIMER_INT_MASK);
> +	regmap_write(pmu->base, JH71XX_PMU_TIMER_INT_MASK, val);
>  	spin_unlock_irqrestore(&pmu->lock, flags);
>  }
>  
> @@ -206,7 +209,7 @@ static irqreturn_t jh71xx_pmu_interrupt(int irq, void *data)
>  	struct jh71xx_pmu *pmu = data;
>  	u32 val;
>  
> -	val = readl(pmu->base + JH71XX_PMU_INT_STATUS);
> +	regmap_read(pmu->base, JH71XX_PMU_INT_STATUS, &val);
>  
>  	if (val & JH71XX_PMU_INT_SEQ_DONE)
>  		dev_dbg(pmu->dev, "sequence done.\n");
> @@ -220,8 +223,8 @@ static irqreturn_t jh71xx_pmu_interrupt(int irq, void *data)
>  		dev_err(pmu->dev, "p-channel fail event.\n");
>  
>  	/* clear interrupts */
> -	writel(val, pmu->base + JH71XX_PMU_INT_STATUS);
> -	writel(val, pmu->base + JH71XX_PMU_EVENT_STATUS);
> +	regmap_write(pmu->base, JH71XX_PMU_INT_STATUS, val);
> +	regmap_write(pmu->base, JH71XX_PMU_EVENT_STATUS, val);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -271,7 +274,7 @@ static int jh71xx_pmu_probe(struct platform_device *pdev)
>  	if (!pmu)
>  		return -ENOMEM;
>  
> -	pmu->base = devm_platform_ioremap_resource(pdev, 0);
> +	pmu->base = device_node_to_regmap(np);
>  	if (IS_ERR(pmu->base))
>  		return PTR_ERR(pmu->base);
>  
> -- 
> 2.25.1
> 

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