From patchwork Tue Oct 6 20:07:50 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 7339701 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6A7BB9F1D5 for ; Tue, 6 Oct 2015 20:08:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E9C9B2076A for ; Tue, 6 Oct 2015 20:08:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 069992074E for ; Tue, 6 Oct 2015 20:08:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753589AbbJFUIF (ORCPT ); Tue, 6 Oct 2015 16:08:05 -0400 Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:58837 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752847AbbJFUIE (ORCPT ); Tue, 6 Oct 2015 16:08:04 -0400 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZjYWe-00013g-UG; Tue, 06 Oct 2015 22:07:52 +0200 Received: from ukl by dude.hi.pengutronix.de with local (Exim 4.86) (envelope-from ) id 1ZjYWe-0005kB-3R; Tue, 06 Oct 2015 22:07:52 +0200 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= To: Roger Quadros , Tony Lindgren Cc: kernel@pengutronix.de, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/2] memory: omap-gpmc: expand the description of the debug facility Date: Tue, 6 Oct 2015 22:07:50 +0200 Message-Id: <1444162070-22034-2-git-send-email-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.6.0 In-Reply-To: <1444162070-22034-1-git-send-email-u.kleine-koenig@pengutronix.de> References: <1444162070-22034-1-git-send-email-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-omap@vger.kernel.org Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Most register values for the chip select setup depend on the frequency of the fck clock. So add a hint that the values setup by the bootloader might differ from the right setup for Linux if the bootloader uses a different frequency. Signed-off-by: Uwe Kleine-König --- drivers/memory/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index c6a644b22af4..1414dd53be57 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -64,6 +64,9 @@ config OMAP_GPMC_DEBUG Enables verbose debugging mostly to decode the bootloader provided timings. Enable this during development to configure devices connected to the GPMC bus. + Note that you cannot just tweak your device tree until the registers + setup by linux match what the bootloader did because that one might + use a different fck frequency influencing most register settings. config MVEBU_DEVBUS bool "Marvell EBU Device Bus Controller"