From patchwork Fri Feb 18 10:09:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Srba X-Patchwork-Id: 12751243 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1571C43217 for ; Fri, 18 Feb 2022 10:12:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233930AbiBRKMr (ORCPT ); Fri, 18 Feb 2022 05:12:47 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:39450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233931AbiBRKMp (ORCPT ); Fri, 18 Feb 2022 05:12:45 -0500 Received: from mxd1.seznam.cz (mxd1.seznam.cz [IPv6:2a02:598:a::78:210]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1319E54BD0; Fri, 18 Feb 2022 02:12:27 -0800 (PST) Received: from email.seznam.cz by email-smtpc5b.ko.seznam.cz (email-smtpc5b.ko.seznam.cz [10.53.13.135]) id 2bb4986670bacc0f2a1d5438; Fri, 18 Feb 2022 11:12:08 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=seznam.cz; s=beta; t=1645179128; bh=O1yakR+wQ73R6dgoL6Xxvcie8RsWurzK8ePFTGUMn0s=; h=Received:From:To:Cc:Subject:Date:Message-Id:X-Mailer:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding:X-szn-frgn: X-szn-frgc; b=Gs8N3jGrxY23jR7LsvnfP/KIqJ5kTP/RhjM/IcpDGb4tXy2dlfUUQY/4dFE+SOOao /Cw5p9cVKksZwdUEVR/ska1fZGjDe0ou1rxa9cXXxD4Tr42cHw7GBcAfiOI0pDPtZQ TINVdXqdTjwNb1hXUHwpnzkbLeRghIaJtwoK6ud4= Received: from localhost.localdomain (ip-111-27.static.ccinternet.cz [147.161.27.111]) by email-relay21.ko.seznam.cz (Seznam SMTPD 1.3.136) with ESMTP; Fri, 18 Feb 2022 11:12:02 +0100 (CET) From: michael.srba@seznam.cz To: Andy Gross , Bjorn Andersson , Rob Herring , Stephen Boyd , Philipp Zabel Cc: Linus Walleij , Florian Fainelli , Arnd Bergmann , Greg Kroah-Hartman , Saravana Kannan , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, Michael Srba , Rob Herring Subject: [PATCH v7 3/5] dt-bindings: bus: add device tree bindings for qcom,ssc-block-bus Date: Fri, 18 Feb 2022 11:09:31 +0100 Message-Id: <20220218100933.32736-3-michael.srba@seznam.cz> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220218100933.32736-1-michael.srba@seznam.cz> References: <20220218100933.32736-1-michael.srba@seznam.cz> MIME-Version: 1.0 X-szn-frgn: <581d1237-1df7-4f8f-a748-f5e794c5ed3b> X-szn-frgc: <0> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Michael Srba Adds bindings for the AHB bus which exposes the SCC block in the global address space. This bus (and the SSC block itself) is present on certain qcom SoCs. In typical configuration, this bus (as some of the clocks and registers that we need to manipulate) is not accessible to the OS, and the resources on this bus are indirectly accessed by communicating with a hexagon CPU core residing in the SSC block. In this configuration, the hypervisor is the one performing the bus initialization for the purposes of bringing the haxagon CPU core out of reset. However, it is possible to change the configuration, in which case this binding serves to allow the OS to initialize the bus. Signed-off-by: Michael Srba Reviewed-by: Rob Herring --- CHANGES: - v2: fix issues caught by by dt-schema - v3: none - v4: address the issues pointed out in the review - v5: clarify type of additional properties; remove ssc_tlmm node for now - v6: none - v7: fix indentation, use imperative in commit message --- .../bindings/bus/qcom,ssc-block-bus.yaml | 143 ++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/qcom,ssc-block-bus.yaml diff --git a/Documentation/devicetree/bindings/bus/qcom,ssc-block-bus.yaml b/Documentation/devicetree/bindings/bus/qcom,ssc-block-bus.yaml new file mode 100644 index 000000000000..4044af0afda8 --- /dev/null +++ b/Documentation/devicetree/bindings/bus/qcom,ssc-block-bus.yaml @@ -0,0 +1,143 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/bus/qcom,ssc-block-bus.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: The AHB Bus Providing a Global View of the SSC Block on (some) qcom SoCs + +maintainers: + - Michael Srba + +description: | + This binding describes the dependencies (clocks, resets, power domains) which + need to be turned on in a sequence before communication over the AHB bus + becomes possible. + + Additionally, the reg property is used to pass to the driver the location of + two sadly undocumented registers which need to be poked as part of the sequence. + +properties: + compatible: + items: + - const: qcom,msm8998-ssc-block-bus + - const: qcom,ssc-block-bus + + reg: + description: | + Shall contain the addresses of the SSCAON_CONFIG0 and SSCAON_CONFIG1 + registers + minItems: 2 + maxItems: 2 + + reg-names: + items: + - const: mpm_sscaon_config0 + - const: mpm_sscaon_config1 + + '#address-cells': + enum: [ 1, 2 ] + + '#size-cells': + enum: [ 1, 2 ] + + ranges: true + + clocks: + minItems: 6 + maxItems: 6 + + clock-names: + items: + - const: xo + - const: aggre2 + - const: gcc_im_sleep + - const: aggre2_north + - const: ssc_xo + - const: ssc_ahbs + + power-domains: + description: Power domain phandles for the ssc_cx and ssc_mx power domains + minItems: 2 + maxItems: 2 + + power-domain-names: + items: + - const: ssc_cx + - const: ssc_mx + + resets: + description: | + Reset phandles for the ssc_reset and ssc_bcr resets (note: ssc_bcr is the + branch control register associated with the ssc_xo and ssc_ahbs clocks) + minItems: 2 + maxItems: 2 + + reset-names: + items: + - const: ssc_reset + - const: ssc_bcr + + qcom,halt-regs: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: describes how to locate the ssc AXI halt register + items: + - items: + - description: Phandle reference to a syscon representing TCSR + - description: offset for the ssc AXI halt register + +required: + - compatible + - reg + - reg-names + - '#address-cells' + - '#size-cells' + - ranges + - clocks + - clock-names + - power-domains + - power-domain-names + - resets + - reset-names + - qcom,halt-regs + +additionalProperties: + type: object + +examples: + - | + #include + #include + #include + + soc { + #address-cells = <1>; + #size-cells = <1>; + + // devices under this node are physically located in the SSC block, connected to an ssc-internal bus; + ssc_ahb_slave: bus@10ac008 { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + compatible = "qcom,msm8998-ssc-block-bus", "qcom,ssc-block-bus"; + reg = <0x10ac008 0x4>, <0x10ac010 0x4>; + reg-names = "mpm_sscaon_config0", "mpm_sscaon_config1"; + + clocks = <&xo>, + <&rpmcc RPM_SMD_AGGR2_NOC_CLK>, + <&gcc GCC_IM_SLEEP>, + <&gcc AGGRE2_SNOC_NORTH_AXI>, + <&gcc SSC_XO>, + <&gcc SSC_CNOC_AHBS_CLK>; + clock-names = "xo", "aggre2", "gcc_im_sleep", "aggre2_north", "ssc_xo", "ssc_ahbs"; + + resets = <&gcc GCC_SSC_RESET>, <&gcc GCC_SSC_BCR>; + reset-names = "ssc_reset", "ssc_bcr"; + + power-domains = <&rpmpd MSM8998_SSCCX>, <&rpmpd MSM8998_SSCMX>; + power-domain-names = "ssc_cx", "ssc_mx"; + + qcom,halt-regs = <&tcsr_mutex_regs 0x26000>; + }; + };