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Message-ID: <20230411-sanctuary-impotent-92964df67a26@spud>
Date: Tue, 11 Apr 2023 21:26:16 +0100
From: Conor Dooley <conor@...nel.org>
To: Changhuang Liang <changhuang.liang@...rfivetech.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Emil Renner Berthing <kernel@...il.dk>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Walker Chen <walker.chen@...rfivetech.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v1 3/7] soc: starfive: Modify ioremap to regmap
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@...rfivetech.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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