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 X-Spam-Level: X-Spam-Status: No, score=-22.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 6D88CC19425 for ; Fri, 4 Dec 2020 16:48:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46362205CB for ; Fri, 4 Dec 2020 16:48:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730955AbgLDQsc (ORCPT ); Fri, 4 Dec 2020 11:48:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:57492 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729262AbgLDQsa (ORCPT ); Fri, 4 Dec 2020 11:48:30 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BB68422AAF; Fri, 4 Dec 2020 16:47:49 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1klEFH-00G234-PO; Fri, 04 Dec 2020 16:47:48 +0000 From: Marc Zyngier To: linux-usb@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Linus Walleij , Bartosz Golaszewski , Johan Hovold , Greg Kroah-Hartman , kernel-team@android.com Subject: [PATCH 3/4] USB: serial: ftdi_sio: Log the CBUS GPIO validity Date: Fri, 4 Dec 2020 16:47:38 +0000 Message-Id: <20201204164739.781812-4-maz@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201204164739.781812-1-maz@kernel.org> References: <20201204164739.781812-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-usb@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linus.walleij@linaro.org, bgolaszewski@baylibre.com, johan@kernel.org, gregkh@linuxfoundation.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The validity of the ftdi CBUS GPIO is pretty hidden so far, and finding out *why* some GPIOs don't work is sometimes hard to identify. So let's help the user by displaying the map of the CBUS pins that are valid for a GPIO. Also, tell the user about the magic ftx-prog tool that can make GPIOs appear: https://github.com/richardeoin/ftx-prog Suggested-by: Linus Walleij Signed-off-by: Marc Zyngier --- drivers/usb/serial/ftdi_sio.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 13e575f16bcd..b9d3b33891fc 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -2012,6 +2012,15 @@ static int ftdi_gpio_init_valid_mask(struct gpio_chip *gc, bitmap_complement(valid_mask, &map, ngpios); + if (bitmap_empty(valid_mask, ngpios)) + dev_warn(&port->dev, "No usable GPIO\n"); + else + dev_info(&port->dev, "Enabling CBUS%*pbl for GPIO\n", + ngpios, valid_mask); + + if (!bitmap_full(valid_mask, ngpios)) + dev_warn_once(&port->dev, "Consider using a tool such as ftx-prog to enable GPIOs if required\n"); + return 0; } -- 2.28.0