From patchwork Wed Sep 30 15:27:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 11809617 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 088C7618 for ; Wed, 30 Sep 2020 15:30:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E89902311C for ; Wed, 30 Sep 2020 15:30:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731164AbgI3PaO (ORCPT ); Wed, 30 Sep 2020 11:30:14 -0400 Received: from retiisi.org.uk ([95.216.213.190]:44656 "EHLO hillosipuli.retiisi.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730915AbgI3P3G (ORCPT ); Wed, 30 Sep 2020 11:29:06 -0400 Received: from lanttu.localdomain (lanttu-e.localdomain [192.168.1.64]) by hillosipuli.retiisi.eu (Postfix) with ESMTP id ACE35634C89 for ; Wed, 30 Sep 2020 18:28:48 +0300 (EEST) From: Sakari Ailus To: linux-media@vger.kernel.org Subject: [PATCH 027/100] ccs: Request for "reset" GPIO Date: Wed, 30 Sep 2020 18:27:45 +0300 Message-Id: <20200930152858.8471-28-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200930152858.8471-1-sakari.ailus@linux.intel.com> References: <20200930152858.8471-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The DT bindings documented "reset-gpios" property but the driver never made use of it. Instead it used a GPIO called "xshutdown", with apprently wrong polarity. Fix this by requesting "reset" GPIO with the right polarity first, and if that fails, then request "xshutdown" GPIO with the old polarity. This way it works for new users as expected while if someone, somewhere, depended on "xshutdown" GPIO, that continues to work as well. Signed-off-by: Sakari Ailus --- drivers/media/i2c/ccs/ccs-core.c | 14 ++++++++++++-- drivers/media/i2c/ccs/ccs.h | 1 + 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c index 1880ed31845e..775037ce361f 100644 --- a/drivers/media/i2c/ccs/ccs-core.c +++ b/drivers/media/i2c/ccs/ccs-core.c @@ -1295,6 +1295,7 @@ static int ccs_power_on(struct device *dev) } usleep_range(1000, 1000); + gpiod_set_value(sensor->reset, 0); gpiod_set_value(sensor->xshutdown, 1); sleep = SMIAPP_RESET_DELAY(sensor->hwcfg->ext_clk); @@ -1381,6 +1382,7 @@ static int ccs_power_on(struct device *dev) return 0; out_cci_addr_fail: + gpiod_set_value(sensor->reset, 1); gpiod_set_value(sensor->xshutdown, 0); clk_disable_unprepare(sensor->ext_clk); @@ -1407,6 +1409,7 @@ static int ccs_power_off(struct device *dev) if (sensor->hwcfg->i2c_addr_alt) ccs_write(sensor, SOFTWARE_RESET, CCS_SOFTWARE_RESET_ON); + gpiod_set_value(sensor->reset, 1); gpiod_set_value(sensor->xshutdown, 0); clk_disable_unprepare(sensor->ext_clk); usleep_range(5000, 5000); @@ -3008,8 +3011,15 @@ static int ccs_probe(struct i2c_client *client) return -EINVAL; } - sensor->xshutdown = devm_gpiod_get_optional(&client->dev, "xshutdown", - GPIOD_OUT_LOW); + sensor->reset = devm_gpiod_get_optional(&client->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(sensor->reset)) + return PTR_ERR(sensor->reset); + /* Support old users that may have used "xshutdown" property. */ + if (!sensor->reset) + sensor->xshutdown = devm_gpiod_get_optional(&client->dev, + "xshutdown", + GPIOD_OUT_LOW); if (IS_ERR(sensor->xshutdown)) return PTR_ERR(sensor->xshutdown); diff --git a/drivers/media/i2c/ccs/ccs.h b/drivers/media/i2c/ccs/ccs.h index 8933f3d40fa5..bfe39e02f5e9 100644 --- a/drivers/media/i2c/ccs/ccs.h +++ b/drivers/media/i2c/ccs/ccs.h @@ -219,6 +219,7 @@ struct ccs_sensor { struct regulator *vana; struct clk *ext_clk; struct gpio_desc *xshutdown; + struct gpio_desc *reset; void *ccs_limits; u8 nbinning_subtypes; struct ccs_binning_subtype binning_subtypes[CCS_LIM_BINNING_SUB_TYPE_MAX_N + 1];