From patchwork Wed Dec 20 19:10:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Timur Tabi X-Patchwork-Id: 10126393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0BCCE6019C for ; Wed, 20 Dec 2017 19:10:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F1FC2283C9 for ; Wed, 20 Dec 2017 19:10:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E680228ADF; Wed, 20 Dec 2017 19:10:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 81A53283C9 for ; Wed, 20 Dec 2017 19:10:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756372AbdLTTKm (ORCPT ); Wed, 20 Dec 2017 14:10:42 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:60472 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755902AbdLTTKk (ORCPT ); Wed, 20 Dec 2017 14:10:40 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id C571E60B1C; Wed, 20 Dec 2017 19:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1513797039; bh=0uWAbpeF9JaiXPEElAOkzJvBfsLD+nFnwrvG/SEqOE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UgAa5AI4PixqrsAKSRzFjZLuFrLSpzkv0KDmXwpGTdZB7wigwI2knb6hBA5dMqJcn eFH2dBD1KYOQasQd0bLoyn0j0echsGI3cOl4oH+4P84Xq9Nh3hoFMMluQC9G20iRZw Qh2rOOzyVykHFrKgrGIwsm0EB3Z5tYzaAtxY1jGs= Received: from timur-ubuntu.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: timur@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 4786260AFE; Wed, 20 Dec 2017 19:10:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1513797039; bh=0uWAbpeF9JaiXPEElAOkzJvBfsLD+nFnwrvG/SEqOE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UgAa5AI4PixqrsAKSRzFjZLuFrLSpzkv0KDmXwpGTdZB7wigwI2knb6hBA5dMqJcn eFH2dBD1KYOQasQd0bLoyn0j0echsGI3cOl4oH+4P84Xq9Nh3hoFMMluQC9G20iRZw Qh2rOOzyVykHFrKgrGIwsm0EB3Z5tYzaAtxY1jGs= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4786260AFE Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=timur@codeaurora.org From: Timur Tabi To: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, Linus Walleij , Andy Shevchenko , Mika Westerberg , thierry.reding@gmail.com, Stephen Boyd , david.brown@linaro.org, andy.gross@linaro.org, Bjorn Andersson , Varadarajan Narayanan , Archit Taneja Cc: timur@codeaurora.org Subject: [PATCH 2/3] [v8] pinctrl: qcom: disable GPIO groups with no pins Date: Wed, 20 Dec 2017 13:10:32 -0600 Message-Id: <1513797033-9494-3-git-send-email-timur@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1513797033-9494-1-git-send-email-timur@codeaurora.org> References: <1513797033-9494-1-git-send-email-timur@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP pinctrl-msm only accepts an array of GPIOs from 0 to n-1, and it expects each group to support have only one pin (npins == 1). We can support "sparse" GPIO maps if we allow for some groups to have zero pins (npins == 0). These pins are "hidden" from the rest of the driver and gpiolib. Access to unavailable GPIOs is blocked via a request callback. If the requested GPIO is unavailable, -EACCES is returned, which prevents further access to that GPIO. Signed-off-by: Timur Tabi Reviewed-by: Stephen Boyd --- drivers/pinctrl/qcom/pinctrl-msm.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c index 7a960590ecaa..d45b4c2b5af1 100644 --- a/drivers/pinctrl/qcom/pinctrl-msm.c +++ b/drivers/pinctrl/qcom/pinctrl-msm.c @@ -507,6 +507,11 @@ static void msm_gpio_dbg_show_one(struct seq_file *s, }; g = &pctrl->soc->groups[offset]; + + /* If the GPIO group has no pins, then don't show it. */ + if (!g->npins) + return; + ctl_reg = readl(pctrl->regs + g->ctl_reg); is_out = !!(ctl_reg & BIT(g->oe_bit)); @@ -516,7 +521,7 @@ static void msm_gpio_dbg_show_one(struct seq_file *s, seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func); seq_printf(s, " %dmA", msm_regval_to_drive(drive)); - seq_printf(s, " %s", pulls[pull]); + seq_printf(s, " %s\n", pulls[pull]); } static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) @@ -524,23 +529,36 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) unsigned gpio = chip->base; unsigned i; - for (i = 0; i < chip->ngpio; i++, gpio++) { + for (i = 0; i < chip->ngpio; i++, gpio++) msm_gpio_dbg_show_one(s, NULL, chip, i, gpio); - seq_puts(s, "\n"); - } } #else #define msm_gpio_dbg_show NULL #endif +/* + * If the requested GPIO has no pins, then treat it as unavailable. + * Otherwise, call the standard request function. + */ +static int msm_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + struct msm_pinctrl *pctrl = gpiochip_get_data(chip); + const struct msm_pingroup *g = &pctrl->soc->groups[offset]; + + if (!g->npins) + return -EACCES; + + return gpiochip_generic_request(chip, offset); +} + static const struct gpio_chip msm_gpio_template = { .direction_input = msm_gpio_direction_input, .direction_output = msm_gpio_direction_output, .get_direction = msm_gpio_get_direction, .get = msm_gpio_get, .set = msm_gpio_set, - .request = gpiochip_generic_request, + .request = msm_gpio_request, .free = gpiochip_generic_free, .dbg_show = msm_gpio_dbg_show, };