From patchwork Tue Nov 9 12:16:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12610499 X-Patchwork-Delegate: geert@linux-m68k.org 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A4F4C43217 for ; Tue, 9 Nov 2021 12:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 353D561152 for ; Tue, 9 Nov 2021 12:16:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241949AbhKIMTi (ORCPT ); Tue, 9 Nov 2021 07:19:38 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:44278 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S241920AbhKIMTi (ORCPT ); Tue, 9 Nov 2021 07:19:38 -0500 X-IronPort-AV: E=Sophos;i="5.87,220,1631545200"; d="scan'208";a="99679487" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 09 Nov 2021 21:16:51 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 75B724392865; Tue, 9 Nov 2021 21:16:49 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Greg Kroah-Hartman , Rob Herring , Jiri Slaby , Philipp Zabel Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 1/3] dt-bindings: serial: renesas,scif: Make resets as a required property Date: Tue, 9 Nov 2021 12:16:29 +0000 Message-Id: <20211109121631.26687-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Make "resets" as required property for RZ/G2L. On RZ/G2L the devices should be explicitly pulled out of reset for this reason make "resets" as required property. Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das Reviewed-by: Geert Uytterhoeven --- v1->v2 * Added the string in alphabetical sort order * Included RB tag from Geert --- Documentation/devicetree/bindings/serial/renesas,scif.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/serial/renesas,scif.yaml b/Documentation/devicetree/bindings/serial/renesas,scif.yaml index 6b8731f7f2fb..21fbfa880e29 100644 --- a/Documentation/devicetree/bindings/serial/renesas,scif.yaml +++ b/Documentation/devicetree/bindings/serial/renesas,scif.yaml @@ -153,6 +153,7 @@ if: enum: - renesas,rcar-gen2-scif - renesas,rcar-gen3-scif + - renesas,scif-r9a07g044 then: required: - resets From patchwork Tue Nov 9 12:16:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12610501 X-Patchwork-Delegate: geert@linux-m68k.org 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 024E2C433EF for ; Tue, 9 Nov 2021 12:17:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC83561152 for ; Tue, 9 Nov 2021 12:17:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242232AbhKIMTp (ORCPT ); Tue, 9 Nov 2021 07:19:45 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:44278 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S242052AbhKIMTl (ORCPT ); Tue, 9 Nov 2021 07:19:41 -0500 X-IronPort-AV: E=Sophos;i="5.87,220,1631545200"; d="scan'208";a="99679493" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 09 Nov 2021 21:16:54 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 3CED04391CBA; Tue, 9 Nov 2021 21:16:52 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Greg Kroah-Hartman , Rob Herring , Jiri Slaby , Philipp Zabel Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 2/3] dt-bindings: serial: renesas,sci: Document RZ/G2L SoC Date: Tue, 9 Nov 2021 12:16:30 +0000 Message-Id: <20211109121631.26687-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Add SCI binding documentation for Renesas RZ/G2L SoC. Also update the example node with RZ/G2L SCI0 node. Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das Reviewed-by: Geert Uytterhoeven --- v1->v2 * Added const "renesas,sci" entry in compatible property for h8300 * Included RB tag from Geert --- .../bindings/serial/renesas,sci.yaml | 44 ++++++++++++++++--- 1 file changed, 38 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/serial/renesas,sci.yaml b/Documentation/devicetree/bindings/serial/renesas,sci.yaml index 22ed2f0b1dc3..141d3b368f10 100644 --- a/Documentation/devicetree/bindings/serial/renesas,sci.yaml +++ b/Documentation/devicetree/bindings/serial/renesas,sci.yaml @@ -14,7 +14,12 @@ allOf: properties: compatible: - const: renesas,sci + oneOf: + - items: + - enum: + - renesas,r9a07g044-sci # RZ/G2{L,LC} + - const: renesas,sci # generic SCI compatible UART + - const: renesas,sci # generic SCI compatible UART reg: maxItems: 1 @@ -54,18 +59,45 @@ required: - clocks - clock-names +if: + properties: + compatible: + contains: + enum: + - renesas,r9a07g044-sci +then: + properties: + resets: + maxItems: 1 + + power-domains: + maxItems: 1 + + required: + - resets + - power-domains + unevaluatedProperties: false examples: - | + #include + #include + aliases { serial0 = &sci0; }; - sci0: serial@ffff78 { - compatible = "renesas,sci"; - reg = <0xffff78 8>; - interrupts = <88 0>, <89 0>, <90 0>, <91 0>; - clocks = <&fclk>; + sci0: serial@1004d000 { + compatible = "renesas,r9a07g044-sci", "renesas,sci"; + reg = <0x1004d000 0x400>; + interrupts = , + , + , + ; + interrupt-names = "eri", "rxi", "txi", "tei"; + clocks = <&cpg CPG_MOD R9A07G044_SCI0_CLKP>; clock-names = "fck"; + power-domains = <&cpg>; + resets = <&cpg R9A07G044_SCI0_RST>; }; From patchwork Tue Nov 9 12:16:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12610503 X-Patchwork-Delegate: geert@linux-m68k.org 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ECDC1C433FE for ; Tue, 9 Nov 2021 12:17:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D98C861152 for ; Tue, 9 Nov 2021 12:17:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242219AbhKIMTu (ORCPT ); Tue, 9 Nov 2021 07:19:50 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:34826 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S242214AbhKIMTo (ORCPT ); Tue, 9 Nov 2021 07:19:44 -0500 X-IronPort-AV: E=Sophos;i="5.87,220,1631545200"; d="scan'208";a="99983750" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 09 Nov 2021 21:16:57 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 070D54392862; Tue, 9 Nov 2021 21:16:54 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Greg Kroah-Hartman , Rob Herring , Jiri Slaby , Philipp Zabel Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 3/3] serial: sh-sci: Add support to deassert/assert reset line Date: Tue, 9 Nov 2021 12:16:31 +0000 Message-Id: <20211109121631.26687-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20211109121631.26687-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org On RZ/G2L SoC we need to explicitly deassert the reset line for the device to work, use this opportunity to deassert/assert reset line in sh-sci driver. This patch adds support to read the "resets" property (if available) from DT and perform deassert/assert when required. Also, propagate the error to the caller of sci_parse_dt() instead of returning NULL in case of failure. Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das Reviewed-by: Philipp Zabel --- v1->v2 * deassert/assert reset line if available on all SoC's * Updated commit message --- drivers/tty/serial/sh-sci.c | 47 ++++++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 89ee43061d3a..7aced84d2f04 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -3203,23 +3204,53 @@ static const struct of_device_id of_sci_match[] = { }; MODULE_DEVICE_TABLE(of, of_sci_match); +static void sci_reset_control_assert(void *data) +{ + reset_control_assert(data); +} + static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id) { struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id; + struct reset_control *rstc; struct plat_sci_port *p; struct sci_port *sp; const void *data; - int id; + int id, ret; if (!IS_ENABLED(CONFIG_OF) || !np) - return NULL; + return ERR_PTR(-EINVAL); + + of_id = of_match_device(of_sci_match, &pdev->dev); + if (!of_id) + return ERR_PTR(-EINVAL); - data = of_device_get_match_data(&pdev->dev); + rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(rstc)) { + dev_err(&pdev->dev, "failed to get reset ctrl %ld\n", PTR_ERR(rstc)); + return ERR_PTR(PTR_ERR(rstc)); + } + + ret = reset_control_deassert(rstc); + if (ret) { + dev_err(&pdev->dev, "failed to deassert reset %d\n", ret); + return ERR_PTR(ret); + } + + ret = devm_add_action_or_reset(&pdev->dev, sci_reset_control_assert, rstc); + if (ret) { + dev_err(&pdev->dev, "failed to register assert devm action, %d\n", + ret); + return ERR_PTR(ret); + } + + data = of_id->data; p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); if (!p) - return NULL; + return ERR_PTR(-ENOMEM); /* Get the line number from the aliases node. */ id = of_alias_get_id(np, "serial"); @@ -3227,11 +3258,11 @@ static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev, id = ffz(sci_ports_in_use); if (id < 0) { dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); - return NULL; + return ERR_PTR(-EINVAL); } if (id >= ARRAY_SIZE(sci_ports)) { dev_err(&pdev->dev, "serial%d out of range\n", id); - return NULL; + return ERR_PTR(-EINVAL); } sp = &sci_ports[id]; @@ -3318,8 +3349,8 @@ static int sci_probe(struct platform_device *dev) if (dev->dev.of_node) { p = sci_parse_dt(dev, &dev_id); - if (p == NULL) - return -EINVAL; + if (IS_ERR(p)) + return PTR_ERR(p); } else { p = dev->dev.platform_data; if (p == NULL) {