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From:   Jianqun Xu <jay.xu@rock-chips.com>
To:     heiko@sntech.de, linus.walleij@linaro.org, robh+dt@kernel.org
Cc:     linux-gpio@vger.kernel.org, linux-rockchip@lists.infradead.org,
        linux-kernel@vger.kernel.org, Jianqun Xu <jay.xu@rock-chips.com>
Subject: [PATCH v5 6/7] gpio/rockchip: always enable clock for gpio controller
Date:   Thu, 27 May 2021 15:14:01 +0800
Message-Id: <20210527071401.1424549-1-jay.xu@rock-chips.com>
In-Reply-To: <20210527071239.1424430-1-jay.xu@rock-chips.com>
References: <20210527071239.1424430-1-jay.xu@rock-chips.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Since gate and ungate pclk of gpio has very litte benifit for system
power consumption, just keep it always ungate.

Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 68 +++++-------------------------------
 1 file changed, 9 insertions(+), 59 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 92aaf1848449..048e7eecddba 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -139,17 +139,8 @@ static int rockchip_gpio_get_direction(struct gpio_chip *chip,
 {
 	struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
 	u32 data;
-	int ret;
 
-	ret = clk_enable(bank->clk);
-	if (ret < 0) {
-		dev_err(bank->drvdata->dev,
-			"failed to enable clock for bank %s\n", bank->name);
-		return ret;
-	}
 	data = rockchip_gpio_readl_bit(bank, offset, bank->gpio_regs->port_ddr);
-	clk_disable(bank->clk);
-
 	if (data & BIT(offset))
 		return GPIO_LINE_DIRECTION_OUT;
 
@@ -163,11 +154,9 @@ static int rockchip_gpio_set_direction(struct gpio_chip *chip,
 	unsigned long flags;
 	u32 data = input ? 0 : 1;
 
-	clk_enable(bank->clk);
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	rockchip_gpio_writel_bit(bank, offset, data, bank->gpio_regs->port_ddr);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
-	clk_disable(bank->clk);
 
 	return 0;
 }
@@ -178,11 +167,9 @@ static void rockchip_gpio_set(struct gpio_chip *gc, unsigned int offset,
 	struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
 	unsigned long flags;
 
-	clk_enable(bank->clk);
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	rockchip_gpio_writel_bit(bank, offset, value, bank->gpio_regs->port_dr);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
-	clk_disable(bank->clk);
 }
 
 static int rockchip_gpio_get(struct gpio_chip *gc, unsigned int offset)
@@ -190,11 +177,10 @@ static int rockchip_gpio_get(struct gpio_chip *gc, unsigned int offset)
 	struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
 	u32 data;
 
-	clk_enable(bank->clk);
 	data = readl(bank->reg_base + bank->gpio_regs->ext_port);
-	clk_disable(bank->clk);
 	data >>= offset;
 	data &= 1;
+
 	return data;
 }
 
@@ -315,9 +301,7 @@ static int rockchip_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
 	if (!bank->domain)
 		return -ENXIO;
 
-	clk_enable(bank->clk);
 	virq = irq_create_mapping(bank->domain, offset);
-	clk_disable(bank->clk);
 
 	return (virq) ? : -ENXIO;
 }
@@ -409,7 +393,6 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	unsigned long flags;
 	int ret = 0;
 
-	clk_enable(bank->clk);
 	raw_spin_lock_irqsave(&bank->slock, flags);
 
 	rockchip_gpio_writel_bit(bank, d->hwirq, 0,
@@ -480,7 +463,6 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 out:
 	irq_gc_unlock(gc);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
-	clk_disable(bank->clk);
 
 	return ret;
 }
@@ -490,10 +472,8 @@ static void rockchip_irq_suspend(struct irq_data *d)
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct rockchip_pin_bank *bank = gc->private;
 
-	clk_enable(bank->clk);
 	bank->saved_masks = irq_reg_readl(gc, bank->gpio_regs->int_mask);
 	irq_reg_writel(gc, ~gc->wake_active, bank->gpio_regs->int_mask);
-	clk_disable(bank->clk);
 }
 
 static void rockchip_irq_resume(struct irq_data *d)
@@ -501,27 +481,7 @@ static void rockchip_irq_resume(struct irq_data *d)
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct rockchip_pin_bank *bank = gc->private;
 
-	clk_enable(bank->clk);
 	irq_reg_writel(gc, bank->saved_masks, bank->gpio_regs->int_mask);
-	clk_disable(bank->clk);
-}
-
-static void rockchip_irq_enable(struct irq_data *d)
-{
-	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
-	struct rockchip_pin_bank *bank = gc->private;
-
-	clk_enable(bank->clk);
-	irq_gc_mask_clr_bit(d);
-}
-
-static void rockchip_irq_disable(struct irq_data *d)
-{
-	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
-	struct rockchip_pin_bank *bank = gc->private;
-
-	irq_gc_mask_set_bit(d);
-	clk_disable(bank->clk);
 }
 
 static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
@@ -530,19 +490,11 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 	struct irq_chip_generic *gc;
 	int ret;
 
-	ret = clk_enable(bank->clk);
-	if (ret) {
-		dev_err(bank->dev, "failed to enable clock for bank %s\n",
-			bank->name);
-		return -EINVAL;
-	}
-
 	bank->domain = irq_domain_add_linear(bank->of_node, 32,
 					&irq_generic_chip_ops, NULL);
 	if (!bank->domain) {
 		dev_warn(bank->dev, "could not init irq domain for bank %s\n",
 			 bank->name);
-		clk_disable(bank->clk);
 		return -EINVAL;
 	}
 
@@ -554,7 +506,6 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 		dev_err(bank->dev, "could not alloc generic chips for bank %s\n",
 			bank->name);
 		irq_domain_remove(bank->domain);
-		clk_disable(bank->clk);
 		return -EINVAL;
 	}
 
@@ -571,8 +522,8 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 	gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
 	gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
 	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
-	gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
-	gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
+	gc->chip_types[0].chip.irq_enable = irq_gc_mask_clr_bit;
+	gc->chip_types[0].chip.irq_disable = irq_gc_mask_set_bit;
 	gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
 	gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
 	gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
@@ -591,7 +542,6 @@ static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
 
 	irq_set_chained_handler_and_data(bank->irq,
 					 rockchip_irq_demux, bank);
-	clk_disable(bank->clk);
 
 	return 0;
 }
@@ -695,7 +645,6 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 		if (IS_ERR(bank->db_clk)) {
 			dev_err(bank->dev, "cannot find debounce clk\n");
 			bank->db_clk = NULL;
-			clk_disable(bank->clk);
 			return -EINVAL;
 		}
 	} else {
@@ -703,7 +652,6 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 		bank->gpio_type = GPIO_TYPE_V1;
 	}
 
-	clk_disable(bank->clk);
 	return 0;
 }
 
@@ -756,15 +704,17 @@ static int rockchip_gpio_probe(struct platform_device *pdev)
 		return ret;
 
 	ret = rockchip_gpiolib_register(bank);
-	if (ret) {
-		clk_disable_unprepare(bank->clk);
-		return ret;
-	}
+	if (ret)
+		goto err_clk;
 
 	platform_set_drvdata(pdev, bank);
 	dev_info(dev, "probed %pOF\n", np);
 
 	return 0;
+err_clk:
+	clk_disable_unprepare(bank->clk);
+
+	return ret;
 }
 
 static int rockchip_gpio_remove(struct platform_device *pdev)
-- 
2.25.1