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=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED 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 8D16CC43381 for ; Sat, 16 Mar 2019 17:26:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 52025218FE for ; Sat, 16 Mar 2019 17:26:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552757202; bh=VU0rq3reJeDpVpe22htPUgcmEuUYpu353RKnyZe2zAQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=0m577mhyS7sQSkT9MguOopkMpmsQy3d2ND/eYmr/b7tBP/vlMn3sHkWLy56O00tWT p2/TIRkqt/X8Ew0pWpQlaYScFgdN4V/Bl/0Pni8LVuHjrU78wDgORLiCfovgnOIN4e qWsiMsnZ/GoNPSYKpTds1/zWf1zU2q9l3nFgi/gc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726640AbfCPR0l (ORCPT ); Sat, 16 Mar 2019 13:26:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:54916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726571AbfCPR0l (ORCPT ); Sat, 16 Mar 2019 13:26:41 -0400 Received: from archlinux (cpc91196-cmbg18-2-0-cust659.5-4.cable.virginm.net [81.96.234.148]) (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 BD30F218E0; Sat, 16 Mar 2019 17:26:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552757200; bh=VU0rq3reJeDpVpe22htPUgcmEuUYpu353RKnyZe2zAQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=sfxIgnaYNjhLvtMnLx+9GCiTFgcKV3ShEfUuXfQhAsHeJgJPYPMh2AISS3ycimOS6 ZfOjMQdDxEXKu8T0YVbY5ZwuDN3KqBQDvVkITqCzXbt2C8OcwhnoamNIrPO/u6WSJM /R63sCSBBblsrmECDVlU/EWXr14DIx18Y1VqOi4U= Date: Sat, 16 Mar 2019 17:26:34 +0000 From: Jonathan Cameron To: Gregory CLEMENT Cc: Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org, Vladimir Zapolskiy , Sylvain Lemieux , Rob Herring , devicetree@vger.kernel.org, Thomas Petazzoni , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 3/4] iio: adc: lpc32xx: Add scale feature Message-ID: <20190316172634.4bb51753@archlinux> In-Reply-To: <20190315095231.17001-4-gregory.clement@bootlin.com> References: <20190315095231.17001-1-gregory.clement@bootlin.com> <20190315095231.17001-4-gregory.clement@bootlin.com> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On Fri, 15 Mar 2019 10:52:30 +0100 Gregory CLEMENT wrote: > Until now this driver only exposed the raw value of the channels. With > this patch, the scale value is also exposed. > > It depends of a regulator supply, and unlike most of the other driver, do > not having this regulator won't prevent to use the driver. The reason for > it is to allow to continue to use this driver with an old device tree. If > there is no regulator supply then the scale won't be exposed. > > Signed-off-by: Gregory CLEMENT I made a minor tweak to downgrade the message if the regulator isn't specified. Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders to play with it. Thanks, Jonathan > --- > drivers/iio/adc/lpc32xx_adc.c | 44 ++++++++++++++++++++++++++++++----- > 1 file changed, 38 insertions(+), 6 deletions(-) > > diff --git a/drivers/iio/adc/lpc32xx_adc.c b/drivers/iio/adc/lpc32xx_adc.c > index f391c1e10136..5d1c76e3aad8 100644 > --- a/drivers/iio/adc/lpc32xx_adc.c > +++ b/drivers/iio/adc/lpc32xx_adc.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > > /* > * LPC32XX registers definitions > @@ -45,6 +46,7 @@ struct lpc32xx_adc_state { > void __iomem *adc_base; > struct clk *clk; > struct completion completion; > + struct regulator *vref; > > u32 value; > }; > @@ -57,7 +59,9 @@ static int lpc32xx_read_raw(struct iio_dev *indio_dev, > { > struct lpc32xx_adc_state *st = iio_priv(indio_dev); > int ret; > - if (mask == IIO_CHAN_INFO_RAW) { > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > mutex_lock(&indio_dev->mlock); > ret = clk_prepare_enable(st->clk); > if (ret) { > @@ -77,22 +81,36 @@ static int lpc32xx_read_raw(struct iio_dev *indio_dev, > mutex_unlock(&indio_dev->mlock); > > return IIO_VAL_INT; > - } > > - return -EINVAL; > + case IIO_CHAN_INFO_SCALE: > + *val = regulator_get_voltage(st->vref) / 1000; > + *val2 = 10; > + > + return IIO_VAL_FRACTIONAL_LOG2; > + default: > + return -EINVAL; > + } > } > > static const struct iio_info lpc32xx_adc_iio_info = { > .read_raw = &lpc32xx_read_raw, > }; > > -#define LPC32XX_ADC_CHANNEL(_index) { \ > +#define LPC32XX_ADC_CHANNEL_BASE(_index) \ > .type = IIO_VOLTAGE, \ > .indexed = 1, \ > .channel = _index, \ > .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > .address = LPC32XXAD_IN * _index, \ > - .scan_index = _index, \ > + .scan_index = _index, > + > +#define LPC32XX_ADC_CHANNEL(_index) { \ > + LPC32XX_ADC_CHANNEL_BASE(_index) \ > +} > + > +#define LPC32XX_ADC_SCALE_CHANNEL(_index) { \ > + LPC32XX_ADC_CHANNEL_BASE(_index) \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \ > } > > static const struct iio_chan_spec lpc32xx_adc_iio_channels[] = { > @@ -101,6 +119,12 @@ static const struct iio_chan_spec lpc32xx_adc_iio_channels[] = { > LPC32XX_ADC_CHANNEL(2), > }; > > +static const struct iio_chan_spec lpc32xx_adc_iio_scale_channels[] = { > + LPC32XX_ADC_SCALE_CHANNEL(0), > + LPC32XX_ADC_SCALE_CHANNEL(1), > + LPC32XX_ADC_SCALE_CHANNEL(2), > +}; > + > static irqreturn_t lpc32xx_adc_isr(int irq, void *dev_id) > { > struct lpc32xx_adc_state *st = dev_id; > @@ -159,6 +183,15 @@ static int lpc32xx_adc_probe(struct platform_device *pdev) > return retval; > } > > + st->vref = devm_regulator_get(&pdev->dev, "vref"); > + if (IS_ERR(st->vref)) { > + iodev->channels = lpc32xx_adc_iio_channels; > + dev_err(&pdev->dev, > + "Missing vref regulator: No scaling available\n"); It isn't an error, so downgraded to dev_info. > + } else { > + iodev->channels = lpc32xx_adc_iio_scale_channels; > + } > + > platform_set_drvdata(pdev, iodev); > > init_completion(&st->completion); > @@ -167,7 +200,6 @@ static int lpc32xx_adc_probe(struct platform_device *pdev) > iodev->dev.parent = &pdev->dev; > iodev->info = &lpc32xx_adc_iio_info; > iodev->modes = INDIO_DIRECT_MODE; > - iodev->channels = lpc32xx_adc_iio_channels; > iodev->num_channels = ARRAY_SIZE(lpc32xx_adc_iio_channels); > > retval = devm_iio_device_register(&pdev->dev, iodev);