linux-kernel - Re: [PATCH RFC 03/14] drivers: irqchip: add PDC irqdomain for wakeup capable GPIOs

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Message-ID: <11d14b08-27ae-d25a-6056-55c1cfbd89b1@kernel.org>
Date:   Mon, 2 Sep 2019 09:21:02 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     swboyd@...omium.org, evgreen@...omium.org,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        mkshah@...eaurora.org, linux-gpio@...r.kernel.org,
        rnayak@...eaurora.org
Subject: Re: [PATCH RFC 03/14] drivers: irqchip: add PDC irqdomain for wakeup
 capable GPIOs

On 30/08/2019 16:58, Lina Iyer wrote:
> On Fri, Aug 30 2019 at 08:50 -0600, Marc Zyngier wrote:
>> [Please use my kernel.org address in the future. The days of this
>> arm.com address are numbered...]
>>
> Sure, will update and repost.
> 
>> On 29/08/2019 19:11, Lina Iyer wrote:
>>> Introduce a new domain for wakeup capable GPIOs. The domain can be
>>> requested using the bus token DOMAIN_BUS_WAKEUP. In the following
>>> patches, we will specify PDC as the wakeup-parent for the TLMM GPIO
>>> irqchip. Requesting a wakeup GPIO will setup the GPIO and the
>>> corresponding PDC interrupt as its parent.
>>>
>>> Co-developed-by: Stephen Boyd <swboyd@...omium.org>
>>> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
>>> ---
>>>  drivers/irqchip/qcom-pdc.c   | 104 ++++++++++++++++++++++++++++++++---
>>>  include/linux/soc/qcom/irq.h |  34 ++++++++++++
>>>  2 files changed, 129 insertions(+), 9 deletions(-)
>>>  create mode 100644 include/linux/soc/qcom/irq.h
>>>

[...]

>>> diff --git a/include/linux/soc/qcom/irq.h b/include/linux/soc/qcom/irq.h
>>> new file mode 100644
>>> index 000000000000..73239917dc38
>>> --- /dev/null
>>> +++ b/include/linux/soc/qcom/irq.h
>>> @@ -0,0 +1,34 @@
>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>> +
>>> +#ifndef __QCOM_IRQ_H
>>> +#define __QCOM_IRQ_H
>>> +
>>> +#include <linux/irqdomain.h>
>>> +
>>> +#define GPIO_NO_WAKE_IRQ	~0U
>>> +
>>> +/**
>>> + * QCOM specific IRQ domain flags that distinguishes the handling of wakeup
>>> + * capable interrupts by different interrupt controllers.
>>> + *
>>> + * IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP: Line must be masked at TLMM and the
>>> + *                                  interrupt configuration is done at PDC
>>> + * IRQ_DOMAIN_FLAG_QCOM_MPM_WAKEUP: Interrupt configuration is handled at TLMM
>>> + */
>>> +#define IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP		(1 << 17)
>>> +#define IRQ_DOMAIN_FLAG_QCOM_MPM_WAKEUP		(1 << 18)
>>
>> Any reason why you're starting at bit 17? The available range in from
>> bit 16... But overall, it would be better if you expressed it as:
>>
>> #define IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP	(IRQ_DOMAIN_FLAG_NONCORE << 0)
>> #define IRQ_DOMAIN_FLAG_QCOM_MPM_WAKEUP (IRQ_DOMAIN_FLAG_NONCORE << 1)
>>
> Okay.
> 
>>> +
>>> +/**
>>> + * irq_domain_qcom_handle_wakeup: Return if the domain handles interrupt
>>> + *                                configuration
>>> + * @parent: irq domain
>>> + *
>>> + * This QCOM specific irq domain call returns if the interrupt controller
>>> + * requires the interrupt be masked at the child interrupt controller.
>>> + */
>>> +static inline bool irq_domain_qcom_handle_wakeup(struct irq_domain *parent)
>>> +{
>>> +	return (parent->flags & IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP);
>>> +}
>>> +
>>> +#endif
>>>
>>
>> But most of this file isn't used by this patch, so maybe it should be
>> moved somewhere else...
>>
> Apart from creating the domain, this is not used here, but a separate
> patch seemed excessive. Let me know if you have any suggestions.

My personal preference would be to move it into the patch that actually
makes use of this.

	M.
-- 
Jazz is not dead, it just smells funny...