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From: David Lechner <david@lechnology.com>
To: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>,
	Marc Zyngier <maz@kernel.org>
Cc: tglx@linutronix.de, jason@lakedaemon.net, "Anna,
	Suman" <s-anna@ti.com>,
	robh+dt@kernel.org, Lee Jones <lee.jones@linaro.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	"Mills, William" <wmills@ti.com>,
	"Bajjuri, Praneeth" <praneeth@ti.com>
Subject: Re: [PATCH v4 4/5] irqchip/irq-pruss-intc: Implement irq_{get,set}_irqchip_state ops
Date: Fri, 31 Jul 2020 10:59:13 -0500
Message-ID: <71007a86-0a62-a180-33b7-7d963d39f84b@lechnology.com> (raw)
In-Reply-To: <CAMxfBF4--kP=tt-1LqMB=W8B6gHYu1vFFMtnLPgc-akeLiK-Yw@mail.gmail.com>

On 7/31/20 7:28 AM, Grzegorz Jaszczyk wrote:
> On Wed, 29 Jul 2020 at 21:23, David Lechner <david@lechnology.com> wrote:
>>
>> On 7/28/20 4:18 AM, Grzegorz Jaszczyk wrote:
>>> From: David Lechner <david@lechnology.com>
>>>
>>> This implements the irq_get_irqchip_state and irq_set_irqchip_state
>>> callbacks for the TI PRUSS INTC driver. The set callback can be used
>>> by drivers to "kick" a PRU by injecting a PRU system event.
>>>
>>> Example:
>>
>> We could improve this example by showing a device tree node of a
>> firmware-defined device implemented in the PRU:
>>
>>          /* Software-defined UART in PRU */
>>          pru_uart: serial@XXXX {
>>                  compatible = "ti,pru-uart";
>>                  ...
>>                  interrupt-parent = <&pruss_intc>;
>>                  /* PRU system event 31, channel 0, host event 0 */
>>                  interrupts = <31 0 0>, ...;
>>                  interrupt-names = "kick", ...;
>>                  ...
>>          },
>>
>> Then driver would request the IRQ during probe:
>>
>>          data->kick_irq = of_irq_get_byname(dev, "kick");
>>          if (data->kick_irq < 0)
>>                  ...
>>
>>
>> And later the driver would use the IRQ to kick the PRU:
>>
>>          irq_set_irqchip_state(data->kick_irq, IRQCHIP_STATE_PENDING, true);
>>
>>
> 
> We could but I am not sure if this kind of complex example should land
> in the commit log.
> Marc could you please comment how you want to see this?
> 
> Thank you,
> Grzegorz
> 

Based on the discussion in the device tree binding patch, the expanded
example I gave is incorrect, so we can just drop it.

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28  9:18 [PATCH v4 0/5] Add TI PRUSS Local Interrupt Controller IRQChip driver Grzegorz Jaszczyk
2020-07-28  9:18 ` [PATCH v4 1/5] dt-bindings: irqchip: Add PRU-ICSS interrupt controller bindings Grzegorz Jaszczyk
2020-07-29 17:34   ` David Lechner
2020-07-31 11:48     ` Grzegorz Jaszczyk
2020-07-31 14:09       ` David Lechner
2020-07-31 14:16         ` Grzegorz Jaszczyk
2020-07-31 14:35           ` Suman Anna
2020-07-31 21:09       ` Rob Herring
2020-08-02 21:49         ` Grzegorz Jaszczyk
2020-07-28  9:18 ` [PATCH v4 2/5] irqchip/irq-pruss-intc: Add a PRUSS irqchip driver for PRUSS interrupts Grzegorz Jaszczyk
2020-07-29 18:43   ` David Lechner
2020-07-31 11:57     ` Grzegorz Jaszczyk
2020-07-28  9:18 ` [PATCH v4 3/5] irqchip/irq-pruss-intc: Add logic for handling reserved interrupts Grzegorz Jaszczyk
2020-07-28 16:37   ` Marc Zyngier
2020-07-28 22:23     ` Grzegorz Jaszczyk
2020-07-29 18:48   ` David Lechner
2020-07-31 14:11     ` Grzegorz Jaszczyk
2020-07-28  9:18 ` [PATCH v4 4/5] irqchip/irq-pruss-intc: Implement irq_{get,set}_irqchip_state ops Grzegorz Jaszczyk
2020-07-29 19:23   ` David Lechner
2020-07-31 12:28     ` Grzegorz Jaszczyk
2020-07-31 15:59       ` David Lechner [this message]
2020-07-28  9:18 ` [PATCH v4 5/5] irqchip/irq-pruss-intc: Add support for ICSSG INTC on K3 SoCs Grzegorz Jaszczyk
2020-07-29 19:28   ` David Lechner
2020-07-31 12:32     ` Grzegorz Jaszczyk

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