[PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Lin Huang]

gpio can keep state even the clock disable, for save power
consumption, only enable gpio clock when it setting

Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
Changes in v5:
-rebase patch

 drivers/pinctrl/pinctrl-rockchip.c | 55 +++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index cc2843a..c5246c0 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -945,6 +945,7 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
 	if (ret < 0)
 		return ret;
 
+	clk_enable(bank->clk);
 	spin_lock_irqsave(&bank->slock, flags);
 
 	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
@@ -956,6 +957,7 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
 	writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
 
 	spin_unlock_irqrestore(&bank->slock, flags);
+	clk_disable(bank->clk);
 
 	return 0;
 }
@@ -1389,6 +1391,7 @@ static void rockchip_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 	unsigned long flags;
 	u32 data;
 
+	clk_enable(bank->clk);
 	spin_lock_irqsave(&bank->slock, flags);
 
 	data = readl(reg);
@@ -1398,6 +1401,7 @@ static void rockchip_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 	writel(data, reg);
 
 	spin_unlock_irqrestore(&bank->slock, flags);
+	clk_disable(bank->clk);
 }
 
 /*
@@ -1409,7 +1413,9 @@ static int rockchip_gpio_get(struct gpio_chip *gc, unsigned offset)
 	struct rockchip_pin_bank *bank = gc_to_pin_bank(gc);
 	u32 data;
 
+	clk_enable(bank->clk);
 	data = readl(bank->reg_base + GPIO_EXT_PORT);
+	clk_disable(bank->clk);
 	data >>= offset;
 	data &= 1;
 	return data;
@@ -1546,6 +1552,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	if (ret < 0)
 		return ret;
 
+	clk_enable(bank->clk);
 	spin_lock_irqsave(&bank->slock, flags);
 
 	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
@@ -1603,6 +1610,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	default:
 		irq_gc_unlock(gc);
 		spin_unlock_irqrestore(&bank->slock, flags);
+		clk_disable(bank->clk);
 		return -EINVAL;
 	}
 
@@ -1611,6 +1619,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 
 	irq_gc_unlock(gc);
 	spin_unlock_irqrestore(&bank->slock, flags);
+	clk_disable(bank->clk);
 
 	return 0;
 }
@@ -1620,8 +1629,10 @@ 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, GPIO_INTMASK);
 	irq_reg_writel(gc, ~gc->wake_active, GPIO_INTMASK);
+	clk_disable(bank->clk);
 }
 
 static void rockchip_irq_resume(struct irq_data *d)
@@ -1629,7 +1640,27 @@ 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, GPIO_INTMASK);
+	clk_disable(bank->clk);
+}
+
+static void rockchip_irq_gc_mask_clr_bit(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);
+}
+
+void rockchip_irq_gc_mask_set_bit(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 platform_device *pdev,
@@ -1640,7 +1671,7 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
 	struct irq_chip_generic *gc;
 	int ret;
-	int i;
+	int i, j;
 
 	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
 		if (!bank->valid) {
@@ -1649,11 +1680,19 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 			continue;
 		}
 
+		ret = clk_enable(bank->clk);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to enable clock for bank %s\n",
+				bank->name);
+			continue;
+		}
+
 		bank->domain = irq_domain_add_linear(bank->of_node, 32,
 						&irq_generic_chip_ops, NULL);
 		if (!bank->domain) {
 			dev_warn(&pdev->dev, "could not initialize irq domain for bank %s\n",
 				 bank->name);
+			clk_disable(bank->clk);
 			continue;
 		}
 
@@ -1664,6 +1703,7 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 			dev_err(&pdev->dev, "could not alloc generic chips for bank %s\n",
 				bank->name);
 			irq_domain_remove(bank->domain);
+			clk_disable(bank->clk);
 			continue;
 		}
 
@@ -1681,8 +1721,9 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 		gc->chip_types[0].regs.mask = GPIO_INTMASK;
 		gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
 		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_mask = rockchip_irq_gc_mask_set_bit;
+		gc->chip_types[0].chip.irq_unmask =
+						  rockchip_irq_gc_mask_clr_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;
@@ -1691,6 +1732,12 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
 
 		irq_set_chained_handler_and_data(bank->irq,
 						 rockchip_irq_demux, bank);
+
+		/* map the gpio irqs here, when the clock is still running */
+		for (j = 0 ; j < 32 ; j++)
+			irq_create_mapping(bank->domain, j);
+
+		clk_disable(bank->clk);
 	}
 
 	return 0;
@@ -1808,7 +1855,7 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank,
 	if (IS_ERR(bank->clk))
 		return PTR_ERR(bank->clk);
 
-	return clk_prepare_enable(bank->clk);
+	return clk_prepare(bank->clk);
 }
 
 static const struct of_device_id rockchip_pinctrl_dt_match[];
-- 
1.9.1

Re: [PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Doug Anderson]

Hi,

On Tue, Aug 11, 2015 at 3:12 AM, Lin Huang <hl@rock-chips.com> wrote:
> gpio can keep state even the clock disable, for save power
> consumption, only enable gpio clock when it setting
>
> Signed-off-by: Lin Huang <hl@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> ---
> Changes in v5:
> -rebase patch
>
>  drivers/pinctrl/pinctrl-rockchip.c | 55 +++++++++++++++++++++++++++++++++++---
>  1 file changed, 51 insertions(+), 4 deletions(-)

Reviewed-by: Douglas Anderson <dianders@chromium.org>

Also in the ChromeOS 3.14 tree (where this patch has been backported):

Tested-by: Douglas Anderson <dianders@chromium.org>

Re: [PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Linus Walleij]

On Tue, Aug 11, 2015 at 12:12 PM, Lin Huang <hl@rock-chips.com> wrote:

> gpio can keep state even the clock disable, for save power
> consumption, only enable gpio clock when it setting
>
> Signed-off-by: Lin Huang <hl@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> ---
> Changes in v5:
> -rebase patch

Patch applied with Doug's test tags etc.

Yours,
Linus Walleij

Re: [PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Heiko Stübner]

Hi Linus,

Am Donnerstag, 13. August 2015, 14:24:28 schrieb Linus Walleij:
> On Tue, Aug 11, 2015 at 12:12 PM, Lin Huang <hl@rock-chips.com> wrote:
> > gpio can keep state even the clock disable, for save power
> > consumption, only enable gpio clock when it setting
> > 
> > Signed-off-by: Lin Huang <hl@rock-chips.com>
> > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> > ---
> > Changes in v5:
> > -rebase patch
> 
> Patch applied with Doug's test tags etc.

did you  also take the first patch?

Aka bot should probably stay together (hence Stephen's Ack for the clock 
change), as the dynamically controlling the gpio clocks exposes the 
pclk_pd_pmu.


Heiko

Re: [PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Linus Walleij]

On Thu, Aug 13, 2015 at 2:37 PM, Heiko Stübner <heiko@sntech.de> wrote:

>> Patch applied with Doug's test tags etc.
>
> did you  also take the first patch?
>
> Aka bot should probably stay together (hence Stephen's Ack for the clock
> change), as the dynamically controlling the gpio clocks exposes the
> pclk_pd_pmu.

OK wasn't obvious to me, patch 1/2 applied to the pinctrl tree now.

Yours,
Linus Walleij
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Re: [PATCH v5 2/2] pinctrl: rockchip: only enable gpio clock when it setting

[Heiko Stübner]

Am Donnerstag, 13. August 2015, 16:11:38 schrieb Linus Walleij:
> On Thu, Aug 13, 2015 at 2:37 PM, Heiko Stübner <heiko@sntech.de> wrote:
> >> Patch applied with Doug's test tags etc.
> > 
> > did you  also take the first patch?
> > 
> > Aka bot should probably stay together (hence Stephen's Ack for the clock
> > change), as the dynamically controlling the gpio clocks exposes the
> > pclk_pd_pmu.
> 
> OK wasn't obvious to me, patch 1/2 applied to the pinctrl tree now.

Thanks for picking patch 1/2 too.

Both me and Lin seem to have forgotten to mention this in this new revision 
(sorry about that), as it was discussed in a previous revision only.
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