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Date: Tue, 22 Nov 2016 15:48:52 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Milo Kim <woogyom.kim@...il.com>
Cc: Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] mfd: tps65217: Make an interrupt handler simpler
On Tue, 15 Nov 2016, Milo Kim wrote:
> Rework the IRQ handler by using HW IRQ number and status bit.
>
> Each HW IRQ number is matched with TPS65217 register layout[*].
> (USB IRQ number is 0, AC is 1, Push button is 2)
>
> When an interrupt is enabled, mask bit should be cleared (unmasked).
> If an interrupt is disabled, then mask bit should be set (masked).
> This mask value is updated into the TPS65217 register in irq_sync_unlock().
>
> Mask bit and interrupt status bit can be handled with HW IRQ number.
> Eventually, additional IRQ data, 'tps65217_irqs[]' and the function,
> 'irq_to_tps65217_irq()' are not necessary.
>
> [*] TPS65217 interrupt register layout
>
> Bit7 6 5 4 3 2 1 0
> ----------------------------------------------
> | x | PBM | ACM | USBM | x | PBI | ACI | USBI
>
> PBM: Push button status change interrupt mask
> ACM: AC interrupt mask
> USBM: USB power status change interrupt mask
> PBI: Push button status change interrupt
> ACI: AC power status change interrupt
> USBI: USB power status change interrupt
> x: Not used
>
> Signed-off-by: Milo Kim <woogyom.kim@...il.com>
> ---
> drivers/mfd/tps65217.c | 44 +++++++++-----------------------------------
> include/linux/mfd/tps65217.h | 1 +
> 2 files changed, 10 insertions(+), 35 deletions(-)
Applied, thanks.
> diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
> index 9d76de9..7376090 100644
> --- a/drivers/mfd/tps65217.c
> +++ b/drivers/mfd/tps65217.c
> @@ -42,26 +42,6 @@ static struct resource pb_resources[] = {
> DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
> };
>
> -struct tps65217_irq {
> - int mask;
> - int interrupt;
> -};
> -
> -static const struct tps65217_irq tps65217_irqs[] = {
> - [TPS65217_IRQ_PB] = {
> - .mask = TPS65217_INT_PBM,
> - .interrupt = TPS65217_INT_PBI,
> - },
> - [TPS65217_IRQ_AC] = {
> - .mask = TPS65217_INT_ACM,
> - .interrupt = TPS65217_INT_ACI,
> - },
> - [TPS65217_IRQ_USB] = {
> - .mask = TPS65217_INT_USBM,
> - .interrupt = TPS65217_INT_USBI,
> - },
> -};
> -
> static void tps65217_irq_lock(struct irq_data *data)
> {
> struct tps65217 *tps = irq_data_get_irq_chip_data(data);
> @@ -74,34 +54,28 @@ static void tps65217_irq_sync_unlock(struct irq_data *data)
> struct tps65217 *tps = irq_data_get_irq_chip_data(data);
> int ret;
>
> - ret = tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
> - TPS65217_PROTECT_NONE);
> + ret = tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK,
> + tps->irq_mask, TPS65217_PROTECT_NONE);
> if (ret != 0)
> dev_err(tps->dev, "Failed to sync IRQ masks\n");
>
> mutex_unlock(&tps->irq_lock);
> }
>
> -static inline const struct tps65217_irq *
> -irq_to_tps65217_irq(struct tps65217 *tps, struct irq_data *data)
> -{
> - return &tps65217_irqs[data->hwirq];
> -}
> -
> static void tps65217_irq_enable(struct irq_data *data)
> {
> struct tps65217 *tps = irq_data_get_irq_chip_data(data);
> - const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
> + u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
>
> - tps->irq_mask &= ~irq_data->mask;
> + tps->irq_mask &= ~mask;
> }
>
> static void tps65217_irq_disable(struct irq_data *data)
> {
> struct tps65217 *tps = irq_data_get_irq_chip_data(data);
> - const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
> + u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
>
> - tps->irq_mask |= irq_data->mask;
> + tps->irq_mask |= mask;
> }
>
> static struct irq_chip tps65217_irq_chip = {
> @@ -150,8 +124,8 @@ static irqreturn_t tps65217_irq_thread(int irq, void *data)
> return IRQ_NONE;
> }
>
> - for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
> - if (status & tps65217_irqs[i].interrupt) {
> + for (i = 0; i < TPS65217_NUM_IRQ; i++) {
> + if (status & BIT(i)) {
> handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
> handled = true;
> }
> @@ -430,7 +404,7 @@ static int tps65217_remove(struct i2c_client *client)
> unsigned int virq;
> int i;
>
> - for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
> + for (i = 0; i < TPS65217_NUM_IRQ; i++) {
> virq = irq_find_mapping(tps->irq_domain, i);
> if (virq)
> irq_dispose_mapping(virq);
> diff --git a/include/linux/mfd/tps65217.h b/include/linux/mfd/tps65217.h
> index 35d8d64..eac2857 100644
> --- a/include/linux/mfd/tps65217.h
> +++ b/include/linux/mfd/tps65217.h
> @@ -79,6 +79,7 @@
> #define TPS65217_INT_PBI BIT(2)
> #define TPS65217_INT_ACI BIT(1)
> #define TPS65217_INT_USBI BIT(0)
> +#define TPS65217_INT_SHIFT 4
> #define TPS65217_INT_MASK (TPS65217_INT_PBM | TPS65217_INT_ACM | \
> TPS65217_INT_USBM)
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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