From patchwork Thu Nov 18 03:10:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar Mahadev Lad X-Patchwork-Id: 518822 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 06685C433EF for ; Thu, 18 Nov 2021 03:11:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E207A61B3B for ; Thu, 18 Nov 2021 03:11:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242706AbhKRDOD (ORCPT ); Wed, 17 Nov 2021 22:14:03 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:51670 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S242675AbhKRDN5 (ORCPT ); Wed, 17 Nov 2021 22:13:57 -0500 X-IronPort-AV: E=Sophos;i="5.87,243,1631545200"; d="scan'208";a="100643655" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 18 Nov 2021 12:10:57 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 2EE944008C4D; Thu, 18 Nov 2021 12:10:55 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Mark Brown , Rob Herring , Philipp Zabel , linux-spi@vger.kernel.org, Arnd Bergmann , devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 2/3] spi: spi-rspi: Add support to deassert/assert reset line Date: Thu, 18 Nov 2021 03:10:40 +0000 Message-Id: <20211118031041.2312-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211118031041.2312-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20211118031041.2312-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-spi@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 spi-rspi driver. This patch adds support to read the "resets" property (if available) from DT and perform deassert/assert when required. Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das Reviewed-by: Geert Uytterhoeven --- v1->v2 * Included RB tag --- drivers/spi/spi-rspi.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index d16ed88802d3..592682d96562 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -1225,8 +1226,14 @@ static const struct of_device_id rspi_of_match[] = { MODULE_DEVICE_TABLE(of, rspi_of_match); +static void rspi_reset_control_assert(void *data) +{ + reset_control_assert(data); +} + static int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr) { + struct reset_control *rstc; u32 num_cs; int error; @@ -1238,6 +1245,24 @@ static int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr) } ctlr->num_chipselect = num_cs; + + rstc = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(rstc)) + return dev_err_probe(dev, PTR_ERR(rstc), + "failed to get reset ctrl\n"); + + error = reset_control_deassert(rstc); + if (error) { + dev_err(dev, "failed to deassert reset %d\n", error); + return error; + } + + error = devm_add_action_or_reset(dev, rspi_reset_control_assert, rstc); + if (error) { + dev_err(dev, "failed to register assert devm action, %d\n", error); + return error; + } + return 0; } #else