[PATCH v4 2/2] pinctrl: rockchip: only enable gpio clock when it setting

Lin Huang
2015-08-07T09:31:12Z

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 v4:
-delete some unrelated new blank line

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