LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Rob Herring <robh@kernel.org>
To: Alex Elder <elder@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	davem@davemloft.net, Arnd Bergmann <arnd@arndb.de>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	ilias.apalodimas@linaro.org, netdev <netdev@vger.kernel.org>,
	devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-soc@vger.kernel.org,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	syadagir@codeaurora.org, mjavid@codeaurora.org
Subject: Re: [RFC PATCH 01/12] dt-bindings: soc: qcom: add IPA bindings
Date: Wed, 7 Nov 2018 08:59:08 -0600
Message-ID: <CABGGiswmpmSUmg9jEW7GnNtL2uXAN7jJOqFO5kG8adq71GuZpw@mail.gmail.com> (raw)
In-Reply-To: <20181107003250.5832-2-elder@linaro.org>

On Tue, Nov 6, 2018 at 6:33 PM Alex Elder <elder@linaro.org> wrote:
>
> Add the binding definitions for the "qcom,ipa" and "qcom,rmnet-ipa"
> device tree nodes.
>
> Signed-off-by: Alex Elder <elder@linaro.org>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,ipa.txt | 136 ++++++++++++++++++
>  .../bindings/soc/qcom/qcom,rmnet-ipa.txt      |  15 ++
>  2 files changed, 151 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt
>
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
> new file mode 100644
> index 000000000000..d4d3d37df029
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
> @@ -0,0 +1,136 @@
> +Qualcomm IPA (IP Accelerator) Driver

Bindings are for h/w not drivers.

> +
> +This binding describes the Qualcomm IPA.  The IPA is capable of offloading
> +certain network processing tasks (e.g. filtering, routing, and NAT) from
> +the main processor.  The IPA currently serves only as a network interface,
> +providing access to an LTE network available via a modem.
> +
> +The IPA sits between multiple independent "execution environments,"
> +including the AP subsystem (APSS) and the modem.  The IPA presents
> +a Generic Software Interface (GSI) to each execution environment.
> +The GSI is an integral part of the IPA, but it is logically isolated
> +and has a distinct interrupt and a separately-defined address space.
> +
> +    ----------   -------------   ---------
> +    |        |   |G|       |G|   |       |
> +    |  APSS  |===|S|  IPA  |S|===| Modem |
> +    |        |   |I|       |I|   |       |
> +    ----------   -------------   ---------
> +
> +See also:
> +  bindings/interrupt-controller/interrupts.txt
> +  bindings/interconnect/interconnect.txt
> +  bindings/soc/qcom/qcom,smp2p.txt
> +  bindings/reserved-memory/reserved-memory.txt
> +  bindings/clock/clock-bindings.txt
> +
> +All properties defined below are required.
> +
> +- compatible:
> +       Must be one of the following compatible strings:
> +               "qcom,ipa-sdm845-modem_init"
> +               "qcom,ipa-sdm845-tz_init"

Normal order is <vendor>,<soc>-<ipblock>.

Don't use '_'.

What's the difference between these 2? It can't be detected somehow?
This might be better expressed as a property. Then if Trustzone
initializes things, it can just add a property.

> +
> +-reg:
> +       Resources specyfing the physical address spaces of the IPA and GSI.

typo

> +
> +-reg-names:
> +       The names of the address space ranges defined by the "reg" property.
> +       Must be "ipa" and "gsi".
> +
> +- interrupts-extended:

Use 'interrupts' here and describe what they are and the order. What
they are connected to (and the need for interrupts-extended) is
outside the scope of this binding.

> +       Specifies the IRQs used by the IPA.  Four cells are required,
> +       specifying: the IPA IRQ; the GSI IRQ; the clock query interrupt
> +       from the modem; and the "ready for stage 2 initialization"
> +       interrupt from the modem.  The first two are hardware IRQs; the
> +       third and fourth are SMP2P input interrupts.
> +
> +- interrupt-names:
> +       The names of the interrupts defined by the "interrupts-extended"
> +       property.  Must be "ipa", "gsi", "ipa-clock-query", and
> +       "ipa-post-init".

Format as one per line.

> +
> +- clocks:
> +       Resource that defines the IPA core clock.
> +
> +- clock-names:
> +       The name used for the IPA core clock.  Must be "core".
> +
> +- interconnects:
> +       Specifies the interconnects used by the IPA.  Three cells are
> +       required, specifying:  the path from the IPA to memory; from
> +       IPA to internal (SoC resident) memory; and between the AP
> +       subsystem and IPA for register access.
> +
> +- interconnect-names:
> +       The names of the interconnects defined by the "interconnects"
> +       property.  Must be "memory", "imem", and "config".
> +
> +- qcom,smem-states
> +       The state bits used for SMP2P output.  Two cells must be specified.
> +       The first indicates whether the value in the second bit is valid
> +       (1 means valid).  The second, if valid, defines whether the IPA
> +       clock is enabled (1 means enabled).
> +
> +- qcom,smem-state-names
> +       The names of the state bits used for SMP2P output.  These must be
> +       "ipa-clock-enabled-valid" and "ipa-clock-enabled".
> +
> +- memory-region
> +       A phandle for a reserved memory area that holds the firmware passed
> +       to Trust Zone for authentication.  (Note, this is required
> +       only for "qcom,ipa-sdm845-tz_init".)
> +
> += EXAMPLE
> +
> +The following example represents the IPA present in the SDM845 SoC.  It
> +shows portions of the "modem-smp2p" node to indicate its relationship
> +with the interrupts and SMEM states used by the IPA.
> +
> +       modem-smp2p {
> +               compatible = "qcom,smp2p";
> +               . . .
> +               ipa_smp2p_out: ipa-ap-to-modem {
> +                       qcom,entry-name = "ipa";
> +                       #qcom,smem-state-cells = <1>;
> +               };
> +
> +               ipa_smp2p_in: ipa-modem-to-ap {
> +                       qcom,entry-name = "ipa";
> +                       interrupt-controller;
> +                       #interrupt-cells = <2>;
> +               };
> +       };
> +
> +       ipa@1e00000 {

ipa@1e40000

> +               compatible = "qcom,ipa-sdm845-modem_init";
> +
> +               reg = <0x1e40000 0x34000>,
> +                     <0x1e04000 0x2c000>;
> +               reg-names = "ipa",
> +                           "gsi";
> +
> +               interrupts-extended = <&intc 0 311 IRQ_TYPE_LEVEL_HIGH>,
> +                                     <&intc 0 432 IRQ_TYPE_LEVEL_HIGH>,
> +                                     <&ipa_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
> +                                     <&ipa_smp2p_in 1 IRQ_TYPE_EDGE_RISING>;
> +               interrupt-names = "ipa",
> +                                 "gsi",
> +                                 "ipa-clock-query",
> +                                 "ipa-post-init";
> +
> +               clocks = <&rpmhcc RPMH_IPA_CLK>;
> +               clock-names = "core";
> +
> +               interconnects = <&qnoc MASTER_IPA &qnoc SLAVE_EBI1>,
> +                               <&qnoc MASTER_IPA &qnoc SLAVE_IMEM>,
> +                               <&qnoc MASTER_APPSS_PROC &qnoc SLAVE_IPA_CFG>;
> +               interconnect-names = "memory",
> +                                    "imem",
> +                                    "config";
> +
> +               qcom,smem-states = <&ipa_smp2p_out 0>,
> +                                  <&ipa_smp2p_out 1>;
> +               qcom,smem-state-names = "ipa-clock-enabled-valid",
> +                                       "ipa-clock-enabled";
> +       };
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt
> new file mode 100644
> index 000000000000..3d0b2aabefc7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt
> @@ -0,0 +1,15 @@
> +Qualcomm IPA RMNet Driver
> +
> +This binding describes the IPA RMNet driver, which is used to
> +represent virtual interfaces available on the modem accessed via
> +the IPA.  Other than the compatible string there are no properties
> +associated with this device.

Only a compatible string is a sure sign this is not a h/w device and
you are just abusing DT to instantiate drivers. Make the IPA driver
instantiate any sub drivers it needs.

Rob

  parent reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-07  0:32 [RFC PATCH 00/12] net: introduce Qualcomm IPA driver Alex Elder
2018-11-07  0:32 ` [RFC PATCH 01/12] dt-bindings: soc: qcom: add IPA bindings Alex Elder
2018-11-07 11:50   ` Arnd Bergmann
2018-11-09 22:38     ` Alex Elder
2018-11-07 14:59   ` Rob Herring [this message]
2018-11-09 22:38     ` Alex Elder
2018-11-11  1:40       ` Rob Herring
2018-11-13 16:28     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 02/12] soc: qcom: ipa: DMA helpers Alex Elder
2018-11-07 12:17   ` Arnd Bergmann
2018-11-13 16:33     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 03/12] soc: qcom: ipa: generic software interface Alex Elder
2018-11-07  0:32 ` [RFC PATCH 04/12] soc: qcom: ipa: immediate commands Alex Elder
2018-11-07 14:36   ` Arnd Bergmann
2018-11-13 16:58     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 05/12] soc: qcom: ipa: IPA interrupts and the microcontroller Alex Elder
2018-11-07  0:32 ` [RFC PATCH 06/12] soc: qcom: ipa: QMI modem communication Alex Elder
2018-11-07  0:32 ` [RFC PATCH 07/12] soc: qcom: ipa: IPA register abstraction Alex Elder
2018-11-07 15:00   ` Arnd Bergmann
2018-11-15  2:48     ` Alex Elder
2018-11-15 14:42       ` Arnd Bergmann
2018-11-07  0:32 ` [RFC PATCH 08/12] soc: qcom: ipa: utility functions Alex Elder
2018-11-07  0:32 ` [RFC PATCH 09/12] soc: qcom: ipa: main IPA source file Alex Elder
2018-11-07 14:08   ` Arnd Bergmann
2018-11-15  3:11     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 10/12] soc: qcom: ipa: data path Alex Elder
2018-11-07 14:55   ` Arnd Bergmann
2018-11-15  3:31     ` Alex Elder
2018-11-15 14:48       ` Arnd Bergmann
2018-11-07  0:32 ` [RFC PATCH 11/12] soc: qcom: ipa: IPA rmnet interface Alex Elder
2018-11-07 13:30   ` Arnd Bergmann
2018-11-07 15:26   ` Dan Williams
2018-11-07  0:32 ` [RFC PATCH 12/12] soc: qcom: ipa: build and "ipa_i.h" Alex Elder
2018-11-07  0:40   ` Randy Dunlap
2018-11-08 16:22     ` Alex Elder
2018-11-07 12:34   ` Arnd Bergmann
2018-11-07 15:46 ` [RFC PATCH 00/12] net: introduce Qualcomm IPA driver Arnd Bergmann

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CABGGiswmpmSUmg9jEW7GnNtL2uXAN7jJOqFO5kG8adq71GuZpw@mail.gmail.com \
    --to=robh@kernel.org \
    --cc=arnd@arndb.de \
    --cc=bjorn.andersson@linaro.org \
    --cc=davem@davemloft.net \
    --cc=devicetree@vger.kernel.org \
    --cc=elder@linaro.org \
    --cc=ilias.apalodimas@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-soc@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mjavid@codeaurora.org \
    --cc=netdev@vger.kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=syadagir@codeaurora.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox