From mboxrd@z Thu Jan 1 00:00:00 1970 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 90E68C433F5 for ; Mon, 15 Nov 2021 17:14:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79A9D63231 for ; Mon, 15 Nov 2021 17:14:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236957AbhKORRD (ORCPT ); Mon, 15 Nov 2021 12:17:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:42942 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236565AbhKORMa (ORCPT ); Mon, 15 Nov 2021 12:12:30 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D345A6322A; Mon, 15 Nov 2021 17:09:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636996175; bh=RwPELUlSRrH8ihBiH8+BhS7PfY7lGPMdxADq8nR8pK0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qtTxebzqiSVwEzELAHxFYT6DK3zPXxCwXSaoUAVY9odAE0kg6Sev7iJDfM56OtzDi PF6X9tZUJRhfnLoJwYH8StHtcD85eL7YO2+rxjAXFKtqxPb6sWHRew3QEzVB+W4Wis 4IPvb6Op0ZKpqXJCWJVegBgiIvRAqET5O2pzfFMw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Pawe=C5=82=20Anikiel?= , Philipp Zabel , Sasha Levin Subject: [PATCH 5.4 044/355] reset: socfpga: add empty driver allowing consumers to probe Date: Mon, 15 Nov 2021 17:59:28 +0100 Message-Id: <20211115165314.975035619@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165313.549179499@linuxfoundation.org> References: <20211115165313.549179499@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paweł Anikiel [ Upstream commit 3ad60b4b3570937f3278509fe6797a5093ce53f8 ] The early reset driver doesn't ever probe, which causes consuming devices to be unable to probe. Add an empty driver to set this device as available, allowing consumers to probe. Signed-off-by: Paweł Anikiel Link: https://lore.kernel.org/r/20210920124141.1166544-4-pan@semihalf.com Signed-off-by: Philipp Zabel Signed-off-by: Sasha Levin --- drivers/reset/reset-socfpga.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c index 96953992c2bb5..1c5236a69dc49 100644 --- a/drivers/reset/reset-socfpga.c +++ b/drivers/reset/reset-socfpga.c @@ -86,3 +86,29 @@ void __init socfpga_reset_init(void) for_each_matching_node(np, socfpga_early_reset_dt_ids) a10_reset_init(np); } + +/* + * The early driver is problematic, because it doesn't register + * itself as a driver. This causes certain device links to prevent + * consumer devices from probing. The hacky solution is to register + * an empty driver, whose only job is to attach itself to the reset + * manager and call probe. + */ +static const struct of_device_id socfpga_reset_dt_ids[] = { + { .compatible = "altr,rst-mgr", }, + { /* sentinel */ }, +}; + +static int reset_simple_probe(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver reset_socfpga_driver = { + .probe = reset_simple_probe, + .driver = { + .name = "socfpga-reset", + .of_match_table = socfpga_reset_dt_ids, + }, +}; +builtin_platform_driver(reset_socfpga_driver); -- 2.33.0