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Date: Wed, 22 May 2013 12:36:00 +0300
From: Stanimir Varbanov <svarbanov@...sol.com>
To: Rohit Vaswani <rvaswani@...eaurora.org>
CC: Linus Walleij <linus.walleij@...aro.org>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Russell King <linux@....linux.org.uk>,
David Brown <davidb@...eaurora.org>,
Bryan Huntsman <bryanh@...eaurora.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] gpio: msm: Add device tree and irqdomain support
for gpio-msm-v2
Hi, Rohit
Thanks for the patch!
On 05/21/2013 09:32 PM, Rohit Vaswani wrote:
> This cleans up the gpio-msm-v2 driver of all the global define usage.
> The number of gpios are now defined in the device tree. This enables
> adding irqdomain support as well.
>
> Signed-off-by: Rohit Vaswani <rvaswani@...eaurora.org>
> ---
<cut>
>
> static DEFINE_SPINLOCK(tlmm_lock);
> @@ -168,18 +173,20 @@ static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
>
> static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> {
> - return MSM_GPIO_TO_INT(chip->base + offset);
> + struct msm_gpio_dev *g_dev = to_msm_gpio_dev(chip);
> + struct irq_domain *domain = g_dev->domain;
> + return irq_create_mapping(domain, offset);
IMO here you should use irq_find_mapping() and create irq mapping once
in .probe. See below comment.
> }
>
<cut>
> -static int msm_gpio_probe(struct platform_device *dev)
> +static struct lock_class_key msm_gpio_lock_class;
> +
> +static int msm_gpio_irq_domain_map(struct irq_domain *d, unsigned int irq,
> + irq_hw_number_t hwirq)
> +{
> + irq_set_lockdep_class(irq, &msm_gpio_lock_class);
> + irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,
> + handle_level_irq);
> + set_irq_flags(irq, IRQF_VALID);
> +
> + return 0;
> +}
> +
> +static const struct irq_domain_ops msm_gpio_irq_domain_ops = {
> + .xlate = irq_domain_xlate_twocell,
> + .map = msm_gpio_irq_domain_map,
> +};
> +
> +static int msm_gpio_irqdomain_init(struct device_node *node, int ngpio)
> {
> - int i, irq, ret;
> + msm_gpio.domain = irq_domain_add_linear(node, ngpio,
> + &msm_gpio_irq_domain_ops, &msm_gpio);
> + if (!msm_gpio.domain) {
> + WARN(1, "Cannot allocate irq_domain\n");
Are you sure that we want to WARN if no memory? I'd return an error and
fail the probe if the driver can't works without interrupts.
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static int msm_gpio_probe(struct platform_device *pdev)
> +{
> + int i, irq, ret, ngpio;
> + struct resource *res;
> +
> + msm_gpio.gpio_chip.label = pdev->name;
> + msm_gpio.gpio_chip.dev = &pdev->dev;
> + of_property_read_u32(pdev->dev.of_node, "ngpio", &ngpio);
> + msm_gpio.gpio_chip.ngpio = ngpio;
> +
> + res = platform_get_resource(&pdev->dev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
> + return -EINVAL;
> + }
> +
> + msm_tlmm_base = devm_ioremap_resource(pdev->dev, res);
> + if (!msm_tlmm_base) {
> + dev_err(&pdev->dev, "Couldn't allocate memory for msm tlmm base\n");
> + return -ENOMEM;
> + }
> +
> + msm_gpio.enabled_irqs = devm_kzalloc(&pdev->dev,
> + sizeof(unsigned long) * ngpio,
> + GFP_KERNEL);
> + msm_gpio.wake_irqs = devm_kzalloc(&pdev->dev,
> + sizeof(unsigned long) * ngpio,
> + GFP_KERNEL);
> + msm_gpio.dual_edge_irqs = devm_kzalloc(&pdev->dev,
> + sizeof(unsigned long) * ngpio,
> + GFP_KERNEL);
> + bitmap_zero(msm_gpio.enabled_irqs, ngpio);
> + bitmap_zero(msm_gpio.wake_irqs, ngpio);
> + bitmap_zero(msm_gpio.dual_edge_irqs, ngpio);
>
> - bitmap_zero(msm_gpio.enabled_irqs, NR_GPIO_IRQS);
> - bitmap_zero(msm_gpio.wake_irqs, NR_GPIO_IRQS);
> - bitmap_zero(msm_gpio.dual_edge_irqs, NR_GPIO_IRQS);
> - msm_gpio.gpio_chip.label = dev->name;
> ret = gpiochip_add(&msm_gpio.gpio_chip);
> - if (ret < 0)
> + if (ret < 0) {
> + dev_err(&pdev->dev, "gpiochip_add failed with error %d\n", ret);
> return ret;
> + }
> +
> + summary_irq = platform_get_irq(pdev, 0);
> + if (summary_irq < 0) {
> + dev_err(&pdev->dev, "No Summary irq defined for msmgpio\n");
> + return summary_irq;
> + }
> +
> + msm_gpio_irqdomain_init(pdev->dev.of_node, msm_gpio.gpio_chip.ngpio);
Adding irqdomain might fail, could you check the return value. And if
irqdomain init fail do we need to set up chained handler for summary_irq
at all?
>
> for (i = 0; i < msm_gpio.gpio_chip.ngpio; ++i) {
> irq = msm_gpio_to_irq(&msm_gpio.gpio_chip, i);
I'd call irq_create_mapping() instead. This way the mapping will be
created once in .probe and use irq_find_mapping() in gpio_to_irq.
> + irq_set_lockdep_class(irq, &msm_gpio_lock_class);
> irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,
> handle_level_irq);
> set_irq_flags(irq, IRQF_VALID);
These three function calls are not needed anymore because
irq_create_mapping() will call internally irqdomain .map operation. The
.map already calls these three functions.
> }
>
> - irq_set_chained_handler(TLMM_SCSS_SUMMARY_IRQ,
> - msm_summary_irq_handler);
> + irq_set_chained_handler(summary_irq, msm_summary_irq_handler);
> +
> return 0;
> }
>
- Stan
--
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