From patchwork Wed Feb 12 09:44:48 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikandan Muralidharan X-Patchwork-Id: 13971636 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 88473C02198 for ; Wed, 12 Feb 2025 09:52:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 13EFE10E834; Wed, 12 Feb 2025 09:52:22 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=microchip.com header.i=@microchip.com header.b="phdJJyW+"; dkim-atps=neutral Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3753E10E834 for ; Wed, 12 Feb 2025 09:52:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1739353941; x=1770889941; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1NSB5qjI3HdwTQRBQBnjuqJ4TpcqIKiTpLxKV/W6NhQ=; b=phdJJyW+yiUYWUlkeoswVx0tttWfceC50UrpO98uy+jsfMPeYMYlviY8 4jbJl3jDeyX+P8soZRTZYg66XiLqoQ6Lf9b963xwpR4L2mz47ZNEtH3eC BNZogS3MeTAlFH/UnBD4gaaOS7Hcgz9vYG4JdsF8f/gAD+XDU54NuCNhV 5wKMhT9dsJg5GXbVRgkigXES3KUmKS7AuHCap0jr3cLWf6Hd1p2HK3wNj TdYNXMxtH2p8HOTdPNhyxPUfl5bxXuWwPMvILPxD+C4V3RqIX5StRkGRi Y0R8G9yb/37t7t2QPBJJ5QYdS+/RHvQIOj2pN4EbTKmlZ/f2LzX+lnFGW g==; X-CSE-ConnectionGUID: qkANol4LQQKG05F3y7BElw== X-CSE-MsgGUID: P7uX/GQ0TOmWM4WVOBVmyA== X-IronPort-AV: E=Sophos;i="6.13,279,1732604400"; d="scan'208";a="37191058" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 12 Feb 2025 02:45:13 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Wed, 12 Feb 2025 02:45:08 -0700 Received: from che-lt-i67131.microchip.com (10.10.85.11) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Wed, 12 Feb 2025 02:45:01 -0700 From: Manikandan Muralidharan To: , , , , , , , , , , , , , CC: Manikandan Muralidharan , "Dharma Balasubiramani" Subject: [PATCH v2 2/3] mfd: atmel-hlcdc: fetch LVDS PLL clock for LVDS display Date: Wed, 12 Feb 2025 15:14:48 +0530 Message-ID: <20250212094449.109622-2-manikandan.m@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250212094449.109622-1-manikandan.m@microchip.com> References: <20250212094449.109622-1-manikandan.m@microchip.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The XLCDC IP supports parallel RGB, MIPI DSI and LVDS Display. The LCD Generic clock (sys_clk) is used for Parallel RGB and MIPI displays, while the LVDS PLL clock (lvds_pll_clk) is used for LVDS displays.Since both the clocks cannot co-exist together in the DT for a given display, this patch first attempts to retrieve sys_clk If that fails,it then tries to acquire lvds_pll_clk. Signed-off-by: Manikandan Muralidharan Signed-off-by: Dharma Balasubiramani --- changes in v2: - Rephrase the comments, commit message and err logs - Replace dev_err wwith dev_warn - Remove Initializing sys_clk and lvds_pll_clk to NULL post devm_kzalloc() call --- drivers/mfd/atmel-hlcdc.c | 16 ++++++++++++++-- include/linux/mfd/atmel-hlcdc.h | 1 + 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c index 4c4e35d404f3..f680392b01ba 100644 --- a/drivers/mfd/atmel-hlcdc.c +++ b/drivers/mfd/atmel-hlcdc.c @@ -108,10 +108,22 @@ static int atmel_hlcdc_probe(struct platform_device *pdev) return PTR_ERR(hlcdc->periph_clk); } + /* + * Retrieve any one of the Main clk required by the LCD to operate: + * + * LCDC Generic Clock (sys_clk) - Parallel RGB and MIPI displays, + * LVDS PLL (lvds_pll_clk) - LVDS display + */ hlcdc->sys_clk = devm_clk_get(dev, "sys_clk"); if (IS_ERR(hlcdc->sys_clk)) { - dev_err(dev, "failed to get system clock\n"); - return PTR_ERR(hlcdc->sys_clk); + dev_warn(dev, + "failed to get LCDC generic clock, trying for LVDS PLL clock instead\n"); + + hlcdc->lvds_pll_clk = devm_clk_get(dev, "lvds_pll_clk"); + if (IS_ERR(hlcdc->lvds_pll_clk)) { + dev_err(dev, "failed to get LVDS PLL clock\n"); + return PTR_ERR(hlcdc->lvds_pll_clk); + } } hlcdc->slow_clk = devm_clk_get(dev, "slow_clk"); diff --git a/include/linux/mfd/atmel-hlcdc.h b/include/linux/mfd/atmel-hlcdc.h index 80d675a03b39..07c2081867fd 100644 --- a/include/linux/mfd/atmel-hlcdc.h +++ b/include/linux/mfd/atmel-hlcdc.h @@ -75,6 +75,7 @@ */ struct atmel_hlcdc { struct regmap *regmap; + struct clk *lvds_pll_clk; struct clk *periph_clk; struct clk *sys_clk; struct clk *slow_clk;