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From: Suman Anna <s-anna@ti.com>
To: Tony Lindgren <tony@atomide.com>, Roger Quadros <rogerq@ti.com>
Cc: ohad@wizery.com, bjorn.andersson@linaro.org,
	david@lechnology.com, nsekhar@ti.com, t-kristo@ti.com,
	nsaulnier@ti.com, jreeder@ti.com, m-karicheri2@ti.com,
	woods.technical@gmail.com, linux-omap@vger.kernel.org,
	linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH v2 01/14] dt-bindings: remoteproc: Add TI PRUSS bindings
Date: Wed, 13 Feb 2019 21:01:48 -0600	[thread overview]
Message-ID: <03273340-6477-4276-a0a9-938325c2242c@ti.com> (raw)
In-Reply-To: <20190205164132.GT5720@atomide.com>

On 2/5/19 10:41 AM, Tony Lindgren wrote:
> * Roger Quadros <rogerq@ti.com> [190205 09:40]:
>> On 04/02/19 18:33, Tony Lindgren wrote:
>>>
>>> 	shrdram2: memory@10000 {
>>> 		device_type = "memory";
>>> 		reg = <0x10000 0x3000>;
>>> 	};
>>
>> Shared RAM is not so straight forward. Both PRU firmwares and both application drivers
>> might need to read/write here. The area split is decided by firmware design and there
>> is no hardware protection to prevent from stomping on each others toes.
>>
>> We need a carveout based memory allocator at least I think that can do a
>> allocate(base_offset, size); into shared RAM.
>>
>> This could be used by pru_rproc driver at firmware load time and by application drivers
>> at initialization time.
>>
>> Thoughts?
> 
> That sounds sane to me :)
> 
>>> If the ti,pruss-gp-mux-sel and ti,pru-interrupt-map are
>>> firmware configuration options, maybe leave them out of
>>> the dts completely and make the app-node optional.
>>
>> Yes the app-node is optional. I will mention it.
>>
>> No, ti,pruss-gp-mux-sel and ti,pru-interrupt-map are not firmware options.
>> But these settings are application/firmware specific.
>>
>> ti,pru-interrupt-map specifies the configuration to be used for the INTC interrupt
>> controller.
> 
> OK. So just to see if we have a standard solution available already..
> It sounds a bit similar to what we're doing with omap-wakeupgen.c
> and stacked interrupts? I wonder if something similar might help
> here?
> 
>> ti,pruss-gp-mux-sel is used to configure this register.
>> "Table 30-20. PRUSS_GPCFG0" in http://www.tij.co.jp/jp/lit/ug/spruhz7h/spruhz7h.pdf
>> "29:26 PR1_PRU0_GP_MUX_SEL"
>>
>> It configures how the pins from the PRUSS module are routed internally
>> to the various modules.

Actually, that's not entirely accurate. This is an internal pinmux (not
controllable per pin, but rather dictates a different sets of groups of
pins at the PRUSS boundary, which are then again multiplexed at the SoC
level using the standard padconf/pinmux. It is a single register per
core into which you can set some values between 0 through 4 IIRC
(unfortunately the values are also not uniform across the various SoCs).

regards
Suman

>>
>> see "30.2.1 PRU-ICSS I/O Interface"
>> and "Table 30-1. PRU-ICSS1 I/O Signals"
> 
> Well these are external signals for PRUSS processor (although not
> necessarily external signals for the SoC). So why not handle them
> with a standard pinctlr binding with #pinctrl-cells?
> 
> Sure it may not even be the Linux pinctrl framework running on the
> main SoC handling these pins, but after all you're describing
> hardware for a processor. Maybe Linus W has some comments on this?
> 
> Regards,
> 
> Tony
> 

  reply	other threads:[~2019-02-14  3:01 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-04 14:22 [PATCH v2 00/14] Add support for TI PRU ICSS Roger Quadros
2019-02-04 14:22 ` [PATCH v2 01/14] dt-bindings: remoteproc: Add TI PRUSS bindings Roger Quadros
2019-02-04 16:33   ` Tony Lindgren
2019-02-05  9:39     ` Roger Quadros
2019-02-05 15:08       ` Murali Karicheri
2019-02-05 15:41         ` Roger Quadros
2019-02-05 16:15           ` Murali Karicheri
2019-02-05 16:19             ` Tony Lindgren
2019-02-06 15:04               ` Roger Quadros
2019-02-14  2:47                 ` Suman Anna
2019-02-05 16:41       ` Tony Lindgren
2019-02-14  3:01         ` Suman Anna [this message]
2019-02-08 13:51   ` Linus Walleij
2019-02-14  3:12     ` Suman Anna
2019-02-14  8:37       ` Linus Walleij
2019-02-14 10:55         ` Roger Quadros
     [not found]           ` <86ef8asfap.wl-marc.zyngier@arm.com>
2019-02-14 15:44             ` Roger Quadros
2019-02-14 15:48               ` Roger Quadros
2019-02-15  0:59                 ` Suman Anna
2019-02-20  9:51                   ` Linus Walleij
2019-02-14 15:51               ` Marc Zyngier
2019-02-14 16:50                 ` Roger Quadros
2019-02-14  2:52   ` Suman Anna
2019-02-14 11:08     ` Roger Quadros
2019-02-14 15:56       ` Tony Lindgren
2019-02-15  1:22         ` Suman Anna
2019-02-15  1:08       ` Suman Anna
2019-02-15 13:43       ` Matthijs van Duin
2019-02-04 14:22 ` [PATCH v2 02/14] soc: ti: pruss: Add a platform driver for PRUSS in TI SoCs Roger Quadros
2019-02-04 14:52   ` Andrew F. Davis
2019-02-04 15:32     ` Roger Quadros
2019-02-04 16:35     ` Tony Lindgren
2019-02-04 14:22 ` [PATCH v2 03/14] dt-binding: irqchip: Add pruss-intc-irq driver for PRUSS interrupts Roger Quadros
2019-02-04 16:36   ` Tony Lindgren
2019-02-14  2:40   ` Suman Anna
2019-02-18 19:32   ` Rob Herring
2019-02-04 14:22 ` [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip " Roger Quadros
2019-02-04 15:11   ` Andrew F. Davis
2019-02-04 15:33     ` Roger Quadros
2019-02-05  8:51       ` Roger Quadros
2019-02-14  2:15         ` Suman Anna
2019-02-04 18:15   ` Tony Lindgren
2019-02-05 10:35     ` Roger Quadros
2019-02-05 11:04       ` Marc Zyngier
2019-02-14  2:16         ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 05/14] remoteproc: add map parameter to da_to_va Roger Quadros
2019-02-04 14:22 ` [PATCH v2 06/14] remoteproc: add page lookup for TI PRU to ELF loader Roger Quadros
2019-02-04 15:19   ` Andrew F. Davis
2019-02-14  2:22     ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 07/14] remoteproc: Add a rproc_set_firmware() API Roger Quadros
2019-02-04 14:22 ` [PATCH v2 08/14] remoteproc: Add support to handle device specific resource types Roger Quadros
2019-02-04 14:22 ` [PATCH v2 09/14] dt-binding: remoteproc: Add binding doc for PRU Cores in the PRU-ICSS Roger Quadros
2019-02-18 19:36   ` Rob Herring
2019-02-04 14:22 ` [PATCH v2 10/14] remoteproc/pru: Add PRU remoteproc driver Roger Quadros
2019-02-14  2:35   ` Suman Anna
2019-02-14  3:44     ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 11/14] remoteproc/pru: Add pru_rproc_set_ctable() and pru_rproc_set_gpimode() Roger Quadros
2019-02-04 14:22 ` [PATCH v2 12/14] remoteproc/pru: Add support for virtio rpmsg stack Roger Quadros
2019-02-04 14:22 ` [PATCH v2 13/14] rpmsg: virtio_rpmsg_bus: move back rpmsg_hdr into a public header Roger Quadros
2019-02-04 14:22 ` [PATCH v2 14/14] rpmsg: pru: add a PRU RPMsg driver Roger Quadros
2019-02-04 15:26   ` Andrew F. Davis

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