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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 03EEBC432BE for ; Mon, 30 Aug 2021 15:38:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB05460ED8 for ; Mon, 30 Aug 2021 15:38:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237311AbhH3PjM (ORCPT ); Mon, 30 Aug 2021 11:39:12 -0400 Received: from mail.kernelconcepts.de ([188.40.83.200]:59968 "EHLO mail.kernelconcepts.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237508AbhH3PjM (ORCPT ); Mon, 30 Aug 2021 11:39:12 -0400 X-Greylist: delayed 2299 seconds by postgrey-1.27 at vger.kernel.org; Mon, 30 Aug 2021 11:39:12 EDT Received: from [217.146.132.69] (helo=yoda.kc.loc) by mail.kernelconcepts.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1mKilN-0007Sb-Uz; Mon, 30 Aug 2021 16:59:54 +0200 From: Florian Boor To: linux-iio@vger.kernel.org Cc: Jonathan.Cameron@huawei.com, Michael.Hennerich@analog.com, Florian Boor Subject: [PATCH] iio: adc: ad799x: Implement selecting external reference voltage input on AD7991, AD7995 and AD7999. Date: Mon, 30 Aug 2021 16:59:34 +0200 Message-Id: <20210830145934.11024-1-florian.boor@kernelconcepts.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Make use of the AD7991_REF_SEL bit and support using the external reference voltage by setting the 'vref-external' property in devicetree. Signed-off-by: Florian Boor --- drivers/iio/adc/ad799x.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c index 18bf8386d50a..3ae7ec72caa3 100644 --- a/drivers/iio/adc/ad799x.c +++ b/drivers/iio/adc/ad799x.c @@ -770,6 +770,7 @@ static int ad799x_probe(struct i2c_client *client, const struct i2c_device_id *id) { int ret; + int extra_config = 0; struct ad799x_state *st; struct iio_dev *indio_dev; const struct ad799x_chip_info *chip_info = @@ -806,6 +807,17 @@ static int ad799x_probe(struct i2c_client *client, if (ret) goto error_disable_reg; + + /* allow to use external reference voltage */ + if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) { + unsigned int vref_external = 0; + of_property_read_u32(client->dev.of_node, "vref-external", + &vref_external); + + if (vref_external) + extra_config |= AD7991_REF_SEL; + } + st->client = client; indio_dev->name = id->name; @@ -815,7 +827,7 @@ static int ad799x_probe(struct i2c_client *client, indio_dev->channels = st->chip_config->channel; indio_dev->num_channels = chip_info->num_channels; - ret = ad799x_update_config(st, st->chip_config->default_config); + ret = ad799x_update_config(st, st->chip_config->default_config | extra_config); if (ret) goto error_disable_vref; -- 2.20.1