From patchwork Tue Nov 21 10:20:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nuno Sa via B4 Relay X-Patchwork-Id: 13462748 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C580D3D39D; Tue, 21 Nov 2023 10:17:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vBOT88LO" Received: by smtp.kernel.org (Postfix) with ESMTPS id 5818BC433AB; Tue, 21 Nov 2023 10:17:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700561839; bh=kR1P1qDaKkBJqKHxLcftCCQPOWdMTfwi8zlle0jyKqw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=vBOT88LOE9Hs6UmC0GZ+CrcV2x6FG/SzD+X2lONoB3JvL2tlNzl3MHT8mw/pDFRT0 lh1dLjA+OWD6POGvUMs7WJ2D42DbnNDq3r3I4QMJlgCh9qf3knMAZVFQ4T/uLwxC5x TrmLPYloHLqJm29RRfg6hQTtscFYPBS6BJil/qawV7Nn2VYbAgd2W2ES3nOG1Bxf7y 03xIs0RPogPghut6UUi37ZmcJw//Km2lM9xesngRIKyagRWdSvXb5Ep14q4t74YJZ5 SH89jBFFCUSLXwfUQWPvtg2gNv3xNHYQXH+VexP+48HP0cZ8aNewkEiGrs08OGDClX eJ59TbPZu538w== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 469B0C5ACB3; Tue, 21 Nov 2023 10:17:19 +0000 (UTC) From: Nuno Sa via B4 Relay Date: Tue, 21 Nov 2023 11:20:17 +0100 Subject: [PATCH 04/12] iio: adc: ad9467: fix reset gpio handling Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231121-dev-iio-backend-v1-4-6a3d542eba35@analog.com> References: <20231121-dev-iio-backend-v1-0-6a3d542eba35@analog.com> In-Reply-To: <20231121-dev-iio-backend-v1-0-6a3d542eba35@analog.com> To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org Cc: Olivier MOYSAN , Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Frank Rowand , Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Nuno Sa X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1700562016; l=2235; i=nuno.sa@analog.com; s=20231116; h=from:subject:message-id; bh=FvM763XbCHeFm7zY4qdHtyTPDglD207l1cPfXL+Oe8g=; b=P0PYKwMAq5iL7cSwivnC4VVCg/v4uxIFKKFnAFSJextBIv6XHP6HMK5EgXWqu3AOEsvidK4k8 XV1C7/S/fs3AY8OC0AcvsmPzFVQheDspuKVpvkfZ3R5cLdaYu3EndBB X-Developer-Key: i=nuno.sa@analog.com; a=ed25519; pk=3NQwYA013OUYZsmDFBf8rmyyr5iQlxV/9H4/Df83o1E= X-Endpoint-Received: by B4 Relay for nuno.sa@analog.com/20231116 with auth_id=100 X-Original-From: Nuno Sa Reply-To: From: Nuno Sa The reset gpio was being requested with GPIOD_OUT_LOW which means, not asserted. Then it was being asserted but never de-asserted which means the devices was left in reset. Fix it by de-asserting the gpio. While at it, moved the handling to it's own function and dropped 'reset_gpio' from the 'struct ad9467_state' as we only need it during probe. On top of that, refactored things so that we now request the gpio asserted (i.e in reset) and then de-assert it. Fixes: ad6797120238 ("iio: adc: ad9467: add support AD9467 ADC") Signed-off-by: Nuno Sa --- drivers/iio/adc/ad9467.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 39eccc28debe..368ea57be117 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -121,7 +121,6 @@ struct ad9467_state { unsigned int output_mode; struct gpio_desc *pwrdown_gpio; - struct gpio_desc *reset_gpio; }; static int ad9467_spi_read(struct spi_device *spi, unsigned int reg) @@ -378,6 +377,23 @@ static int ad9467_preenable_setup(struct adi_axi_adc_conv *conv) return ad9467_outputmode_set(st->spi, st->output_mode); } +static int ad9467_reset(struct device *dev) +{ + struct gpio_desc *gpio; + + gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + if (!gpio) + return 0; + + fsleep(1); + gpiod_direction_output(gpio, 0); + fsleep(10); + + return 0; +} + static int ad9467_probe(struct spi_device *spi) { const struct ad9467_chip_info *info; @@ -408,18 +424,9 @@ static int ad9467_probe(struct spi_device *spi) if (IS_ERR(st->pwrdown_gpio)) return PTR_ERR(st->pwrdown_gpio); - st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", - GPIOD_OUT_LOW); - if (IS_ERR(st->reset_gpio)) - return PTR_ERR(st->reset_gpio); - - if (st->reset_gpio) { - udelay(1); - ret = gpiod_direction_output(st->reset_gpio, 1); - if (ret) - return ret; - mdelay(10); - } + ret = ad9467_reset(&spi->dev); + if (ret) + return ret; conv->chip_info = &info->axi_adc_info;