From patchwork Thu Sep 2 21:51:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12472609 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,USER_AGENT_GIT autolearn=unavailable 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 7EDC5C4167E for ; Thu, 2 Sep 2021 21:52:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EB5860E8B for ; Thu, 2 Sep 2021 21:52:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347831AbhIBVx4 (ORCPT ); Thu, 2 Sep 2021 17:53:56 -0400 Received: from relay10.mail.gandi.net ([217.70.178.230]:37657 "EHLO relay10.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347772AbhIBVxu (ORCPT ); Thu, 2 Sep 2021 17:53:50 -0400 Received: (Authenticated sender: miquel.raynal@bootlin.com) by relay10.mail.gandi.net (Postfix) with ESMTPSA id 7C36B240008; Thu, 2 Sep 2021 21:52:48 +0000 (UTC) From: Miquel Raynal To: Jonathan Cameron , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Dmitry Torokhov , Lee Jones , bcousson@baylibre.com, Tony Lindgren Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-input@vger.kernel.org, linux-omap@vger.kernel.org, Thomas Petazzoni , Vignesh Raghavendra , Lokesh Vutla , Tero Kristo , Ryan Barnett , Grygorii Strashko , Jason Reeder , Miquel Raynal , Jonathan Cameron Subject: [PATCH v2 32/46] mfd: ti_am335x_tscadc: Introduce has_tsc Date: Thu, 2 Sep 2021 23:51:30 +0200 Message-Id: <20210902215144.507243-33-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210902215144.507243-1-miquel.raynal@bootlin.com> References: <20210902215144.507243-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org One way of knowing which hardware we are dealing with is to check its compatible. When this must be done at several places, it's best to use a proper boolean for that. ->has_tsc indicates if there is a touchscreen controller available (meaning it's a am33xx-like ADC) or not but does not indicate if it is actually used (that is the purpose of the use_tsc boolean in the probe). Introducing this boolean helps making a difference in the code between what is generic to both types of ADCs and what is specific to the am33xx hardware before introducing support for the am437x hardware. Signed-off-by: Miquel Raynal Reviewed-by: Jonathan Cameron --- drivers/mfd/ti_am335x_tscadc.c | 37 +++++++++++++++++----------- include/linux/mfd/ti_am335x_tscadc.h | 1 + 2 files changed, 23 insertions(+), 15 deletions(-) diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index cfdef833dffb..29ada9da8826 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -105,8 +105,9 @@ static void tscadc_idle_config(struct ti_tscadc_dev *tscadc) { unsigned int idleconfig; - idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM | - STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN; + idleconfig = STEPCONFIG_INM_ADCREFM | STEPCONFIG_INP_ADCREFM; + if (tscadc->data->has_tsc) + idleconfig |= STEPCONFIG_YNN | STEPCONFIG_YPN; regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig); } @@ -140,12 +141,14 @@ static int ti_tscadc_probe(struct platform_device *pdev) tscadc->data = of_device_get_match_data(&pdev->dev); - node = of_get_child_by_name(pdev->dev.of_node, "tsc"); - of_property_read_u32(node, "ti,wires", &tscmag_wires); - of_property_read_u32(node, "ti,coordiante-readouts", &readouts); - of_node_put(node); - if (tscmag_wires) - use_tsc = true; + if (tscadc->data->has_tsc) { + node = of_get_child_by_name(pdev->dev.of_node, "tsc"); + of_property_read_u32(node, "ti,wires", &tscmag_wires); + of_property_read_u32(node, "ti,coordiante-readouts", &readouts); + of_node_put(node); + if (tscmag_wires) + use_tsc = true; + } node = of_get_child_by_name(pdev->dev.of_node, "adc"); of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) { @@ -223,13 +226,16 @@ static int ti_tscadc_probe(struct platform_device *pdev) regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div); /* Set the control register bits */ - tscadc->ctrl = CNTRLREG_TSC_STEPCONFIGWRT | CNTRLREG_STEPID; - if (use_tsc) { - tscadc->ctrl |= CNTRLREG_TSC_ENB; - if (tscmag_wires == 5) - tscadc->ctrl |= CNTRLREG_TSC_5WIRE; - else - tscadc->ctrl |= CNTRLREG_TSC_4WIRE; + tscadc->ctrl = CNTRLREG_STEPID; + if (tscadc->data->has_tsc) { + tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT; + if (use_tsc) { + tscadc->ctrl |= CNTRLREG_TSC_ENB; + if (tscmag_wires == 5) + tscadc->ctrl |= CNTRLREG_TSC_5WIRE; + else + tscadc->ctrl |= CNTRLREG_TSC_4WIRE; + } } regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); @@ -325,6 +331,7 @@ static int __maybe_unused tscadc_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume); static const struct ti_tscadc_data tscdata = { + .has_tsc = true, .name_tscmag = "TI-am335x-tsc", .compat_tscmag = "ti,am3359-tsc", .name_adc = "TI-am335x-adc", diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index 29d3195b0193..3dbdb827566c 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -156,6 +156,7 @@ #define TSCADC_CELLS 2 struct ti_tscadc_data { + bool has_tsc; char *name_tscmag; char *compat_tscmag; char *name_adc;