From patchwork Fri Jun 11 16:56:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 458761 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD717C48BD1 for ; Fri, 11 Jun 2021 16:56:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96E896100B for ; Fri, 11 Jun 2021 16:56:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229548AbhFKQ6k (ORCPT ); Fri, 11 Jun 2021 12:58:40 -0400 Received: from relmlor1.renesas.com ([210.160.252.171]:14102 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230446AbhFKQ6j (ORCPT ); Fri, 11 Jun 2021 12:58:39 -0400 X-IronPort-AV: E=Sophos;i="5.83,265,1616425200"; d="scan'208";a="84115105" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 12 Jun 2021 01:56:41 +0900 Received: from localhost.localdomain (unknown [10.226.92.121]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 27372400C4C6; Sat, 12 Jun 2021 01:56:36 +0900 (JST) From: Biju Das To: Philipp Zabel Cc: Biju Das , Chris Brandt , Wolfram Sang , Arnd Bergmann , Jarkko Nikula , Jean Delvare , Khalil Blaiech , Krzysztof Kozlowski , =?utf-8?b?QmVuY2UgQ3PDs2vDoXM=?= , Yicong Yang , Mike Rapoport , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , linux-i2c@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH 3/5] i2c: riic: Add RZ/G2L support Date: Fri, 11 Jun 2021 17:56:22 +0100 Message-Id: <20210611165624.30749-4-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210611165624.30749-1-biju.das.jz@bp.renesas.com> References: <20210611165624.30749-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org RZ/G2L i2c controller is compatible with RZ/A i2c controller. By default IP is in reset state, so need to perform release reset before accessing any register. Signed-off-by: Biju Das Reviewed-by: Lad Prabhakar --- drivers/i2c/busses/Kconfig | 1 + drivers/i2c/busses/i2c-riic.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 281a65d9b44b..5da09288b461 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -941,6 +941,7 @@ config I2C_QUP config I2C_RIIC tristate "Renesas RIIC adapter" depends on ARCH_RENESAS || COMPILE_TEST + select RESET_CONTROLLER help If you say yes to this option, support will be included for the Renesas RIIC I2C interface. diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index 4eccc0f69861..a3860631c6db 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -42,8 +42,10 @@ #include #include #include +#include #include #include +#include #define RIIC_ICCR1 0x00 #define RIIC_ICCR2 0x04 @@ -86,6 +88,11 @@ #define RIIC_INIT_MSG -1 +enum riic_type { + RIIC_RZ_A, + RIIC_RZ_G2L, +}; + struct riic_dev { void __iomem *base; u8 *buf; @@ -395,7 +402,9 @@ static int riic_i2c_probe(struct platform_device *pdev) struct i2c_adapter *adap; struct resource *res; struct i2c_timings i2c_t; + struct reset_control *rstc; int i, ret; + enum riic_type type; riic = devm_kzalloc(&pdev->dev, sizeof(*riic), GFP_KERNEL); if (!riic) @@ -412,6 +421,17 @@ static int riic_i2c_probe(struct platform_device *pdev) return PTR_ERR(riic->clk); } + type = (enum riic_type)of_device_get_match_data(&pdev->dev); + if (type == RIIC_RZ_G2L) { + rstc = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(rstc)) { + dev_err(&pdev->dev, "Error: missing reset ctrl\n"); + return PTR_ERR(rstc); + } + + reset_control_deassert(rstc); + } + for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) { res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num); if (!res) @@ -472,6 +492,7 @@ static int riic_i2c_remove(struct platform_device *pdev) } static const struct of_device_id riic_i2c_dt_ids[] = { + { .compatible = "renesas,riic-r9a07g044", .data = (void *)RIIC_RZ_G2L }, { .compatible = "renesas,riic-rz" }, { /* Sentinel */ }, };