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Message-Id: <20120330220619.334AC3E054E@localhost>
Date: Fri, 30 Mar 2012 16:06:19 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Thomas Abraham <thomas.abraham@...aro.org>,
linux-kernel@...r.kernel.org
Cc: k.lewandowsk@...sung.com, devicetree-discuss@...ts.ozlabs.org,
rob.herring@...xeda.com, kgene.kim@...sung.com,
broonie@...nsource.wolfsonmicro.com, myungjoo.ham@...sung.com,
kyungmin.park@...sung.com, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, patches@...aro.org
Subject: Re: [PATCH v4 1/2] mfd: add irq domain support for max8997 interrupts
On Sat, 24 Mar 2012 15:19:49 +0530, Thomas Abraham <thomas.abraham@...aro.org> wrote:
> Add irq domain support for max8997 interrupts. The reverse mapping method
> used is linear mapping since the sub-drivers of max8997 such as regulator
> and charger drivers can use the max8997 irq_domain to get the linux irq
> number for max8997 interrupts. All uses of irq_base in platform data and
> max8997 driver private data are removed.
>
> Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
> Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
> Acked-by: Grant Likely <grant.likely@...retlab.ca>
> ---
> arch/arm/mach-exynos/mach-nuri.c | 4 --
> arch/arm/mach-exynos/mach-origen.c | 1 -
> drivers/mfd/max8997-irq.c | 61 ++++++++++++++++++++--------------
> drivers/mfd/max8997.c | 1 -
> include/linux/mfd/max8997-private.h | 4 ++-
> include/linux/mfd/max8997.h | 1 -
> 6 files changed, 39 insertions(+), 33 deletions(-)
>
> diff --git a/arch/arm/mach-exynos/mach-nuri.c b/arch/arm/mach-exynos/mach-nuri.c
> index 7ac81ce..b21d85d 100644
> --- a/arch/arm/mach-exynos/mach-nuri.c
> +++ b/arch/arm/mach-exynos/mach-nuri.c
> @@ -1077,12 +1077,8 @@ static struct platform_device nuri_max8903_device = {
> static void __init nuri_power_init(void)
> {
> int gpio;
> - int irq_base = IRQ_GPIO_END + 1;
> int ta_en = 0;
>
> - nuri_max8997_pdata.irq_base = irq_base;
> - irq_base += MAX8997_IRQ_NR;
> -
> gpio = EXYNOS4_GPX0(7);
> gpio_request(gpio, "AP_PMIC_IRQ");
> s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(0xf));
> diff --git a/arch/arm/mach-exynos/mach-origen.c b/arch/arm/mach-exynos/mach-origen.c
> index 827cb99..d3b2e9d 100644
> --- a/arch/arm/mach-exynos/mach-origen.c
> +++ b/arch/arm/mach-exynos/mach-origen.c
> @@ -424,7 +424,6 @@ static struct max8997_platform_data __initdata origen_max8997_pdata = {
> .buck1_gpiodvs = false,
> .buck2_gpiodvs = false,
> .buck5_gpiodvs = false,
> - .irq_base = IRQ_GPIO_END + 1,
>
> .ignore_gpiodvs_side_effect = true,
> .buck125_default_idx = 0x0,
> diff --git a/drivers/mfd/max8997-irq.c b/drivers/mfd/max8997-irq.c
> index 09274cf..00390a1 100644
> --- a/drivers/mfd/max8997-irq.c
> +++ b/drivers/mfd/max8997-irq.c
> @@ -142,7 +142,8 @@ static void max8997_irq_sync_unlock(struct irq_data *data)
> static const inline struct max8997_irq_data *
> irq_to_max8997_irq(struct max8997_dev *max8997, int irq)
> {
> - return &max8997_irqs[irq - max8997->irq_base];
> + struct irq_data *data = irq_get_irq_data(irq);
> + return &max8997_irqs[data->hwirq];
> }
Haha, this is kind of bogus now. There are only two users of this
function, and *both* of them already have the irq_data pointer.
Instead of this, delete this function entirely and make each caller
derefernce max8997_irqs directly:
const struct max8997_irq_data *irq_data = &max8997_irqs[data->hwirq];
Otherwise, looks good. After fixing you can add my:
Acked-by: Grant Likely <grant.likely@...retlab.ca>
>
> static void max8997_irq_mask(struct irq_data *data)
> @@ -182,7 +183,7 @@ static irqreturn_t max8997_irq_thread(int irq, void *data)
> u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {};
> u8 irq_src;
> int ret;
> - int i;
> + int i, cur_irq;
>
> ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src);
> if (ret < 0) {
> @@ -269,8 +270,11 @@ static irqreturn_t max8997_irq_thread(int irq, void *data)
>
> /* Report */
> for (i = 0; i < MAX8997_IRQ_NR; i++) {
> - if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask)
> - handle_nested_irq(max8997->irq_base + i);
> + if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask) {
> + cur_irq = irq_find_mapping(max8997->irq_domain, i);
> + if (cur_irq)
> + handle_nested_irq(cur_irq);
> + }
> }
>
> return IRQ_HANDLED;
> @@ -278,26 +282,40 @@ static irqreturn_t max8997_irq_thread(int irq, void *data)
>
> int max8997_irq_resume(struct max8997_dev *max8997)
> {
> - if (max8997->irq && max8997->irq_base)
> - max8997_irq_thread(max8997->irq_base, max8997);
> + if (max8997->irq && max8997->irq_domain)
> + max8997_irq_thread(0, max8997);
> + return 0;
> +}
> +
> +static int max8997_irq_domain_map(struct irq_domain *d, unsigned int irq,
> + irq_hw_number_t hw)
> +{
> + struct max8997_dev *max8997 = d->host_data;
> +
> + irq_set_chip_data(irq, max8997);
> + irq_set_chip_and_handler(irq, &max8997_irq_chip, handle_edge_irq);
> + irq_set_nested_thread(irq, 1);
> +#ifdef CONFIG_ARM
> + set_irq_flags(irq, IRQF_VALID);
> +#else
> + irq_set_noprobe(irq);
> +#endif
> return 0;
> }
>
> +static struct irq_domain_ops max8997_irq_domain_ops = {
> + .map = max8997_irq_domain_map,
> +};
> +
> int max8997_irq_init(struct max8997_dev *max8997)
> {
> + struct irq_domain *domain;
> int i;
> - int cur_irq;
> int ret;
> u8 val;
>
> if (!max8997->irq) {
> dev_warn(max8997->dev, "No interrupt specified.\n");
> - max8997->irq_base = 0;
> - return 0;
> - }
> -
> - if (!max8997->irq_base) {
> - dev_err(max8997->dev, "No interrupt base specified.\n");
> return 0;
> }
>
> @@ -327,18 +345,11 @@ int max8997_irq_init(struct max8997_dev *max8997)
> true : false;
> }
>
> - /* Register with genirq */
> - for (i = 0; i < MAX8997_IRQ_NR; i++) {
> - cur_irq = i + max8997->irq_base;
> - irq_set_chip_data(cur_irq, max8997);
> - irq_set_chip_and_handler(cur_irq, &max8997_irq_chip,
> - handle_edge_irq);
> - irq_set_nested_thread(cur_irq, 1);
> -#ifdef CONFIG_ARM
> - set_irq_flags(cur_irq, IRQF_VALID);
> -#else
> - irq_set_noprobe(cur_irq);
> -#endif
> + domain = irq_domain_add_linear(NULL, MAX8997_IRQ_NR,
> + &max8997_irq_domain_ops, &max8997);
> + if (!domain) {
> + dev_err(max8997->dev, "could not create irq domain\n");
> + return -ENODEV;
> }
>
> ret = request_threaded_irq(max8997->irq, NULL, max8997_irq_thread,
> diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c
> index cb83a7a..20ecad3 100644
> --- a/drivers/mfd/max8997.c
> +++ b/drivers/mfd/max8997.c
> @@ -143,7 +143,6 @@ static int max8997_i2c_probe(struct i2c_client *i2c,
> if (!pdata)
> goto err;
>
> - max8997->irq_base = pdata->irq_base;
> max8997->ono = pdata->ono;
>
> mutex_init(&max8997->iolock);
> diff --git a/include/linux/mfd/max8997-private.h b/include/linux/mfd/max8997-private.h
> index 3f4deb6..830152c 100644
> --- a/include/linux/mfd/max8997-private.h
> +++ b/include/linux/mfd/max8997-private.h
> @@ -23,6 +23,8 @@
> #define __LINUX_MFD_MAX8997_PRIV_H
>
> #include <linux/i2c.h>
> +#include <linux/export.h>
> +#include <linux/irqdomain.h>
>
> #define MAX8997_REG_INVALID (0xff)
>
> @@ -325,7 +327,7 @@ struct max8997_dev {
>
> int irq;
> int ono;
> - int irq_base;
> + struct irq_domain *irq_domain;
> struct mutex irqlock;
> int irq_masks_cur[MAX8997_IRQ_GROUP_NR];
> int irq_masks_cache[MAX8997_IRQ_GROUP_NR];
> diff --git a/include/linux/mfd/max8997.h b/include/linux/mfd/max8997.h
> index fff5905..818486c 100644
> --- a/include/linux/mfd/max8997.h
> +++ b/include/linux/mfd/max8997.h
> @@ -155,7 +155,6 @@ struct max8997_led_platform_data {
>
> struct max8997_platform_data {
> /* IRQ */
> - int irq_base;
> int ono;
> int wakeup;
>
> --
> 1.6.6.rc2
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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