From patchwork Wed Aug 25 15:25:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12458075 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=-14.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, 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 C4133C2BA57 for ; Wed, 25 Aug 2021 15:34:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC1956109E for ; Wed, 25 Aug 2021 15:34:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241976AbhHYPfm (ORCPT ); Wed, 25 Aug 2021 11:35:42 -0400 Received: from mslow1.mail.gandi.net ([217.70.178.240]:33887 "EHLO mslow1.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241908AbhHYPfh (ORCPT ); Wed, 25 Aug 2021 11:35:37 -0400 Received: from relay6-d.mail.gandi.net (unknown [217.70.183.198]) by mslow1.mail.gandi.net (Postfix) with ESMTP id 73F49C82E9; Wed, 25 Aug 2021 15:26:43 +0000 (UTC) Received: (Authenticated sender: miquel.raynal@bootlin.com) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id EAEB8C001A; Wed, 25 Aug 2021 15:26:17 +0000 (UTC) From: Miquel Raynal To: Jonathan Cameron , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Lee Jones , bcousson@baylibre.com, Tony Lindgren , Tero Kristo , Michael Turquette , Stephen Boyd Cc: Thomas Petazzoni , "Ryan J . Barnett" , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-input@vger.kernel.org, linux-omap@vger.kernel.org, linux-clk@vger.kernel.org, Miquel Raynal , Jason Reeder Subject: [PATCH 28/40] mfd: ti_am335x_tscadc: Add ADC1/magnetic reader support Date: Wed, 25 Aug 2021 17:25:06 +0200 Message-Id: <20210825152518.379386-29-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210825152518.379386-1-miquel.raynal@bootlin.com> References: <20210825152518.379386-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Introduce a new compatible that has another set of driver data, targeting am437x SoCs with a magnetic reader instead of the touchscreen and a more featureful set of registers. Co-developed-by: Jason Reeder Signed-off-by: Miquel Raynal Signed-off-by: Jason Reeder --- drivers/mfd/ti_am335x_tscadc.c | 43 ++++++++++++++++++++++------ include/linux/mfd/ti_am335x_tscadc.h | 9 +++++- 2 files changed, 43 insertions(+), 9 deletions(-) diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index 1a30610dc65f..f4f6b9db4d2a 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -122,9 +122,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) const __be32 *cur; struct clk *clk; u32 val; - bool use_tsc = false; + bool use_tsc = false, use_mag = false; int tscmag_wires = 0, adc_channels = 0, readouts = 0, cell_idx = 0; - int total_channels, err; + int mag_tracks = 0, total_channels, err; /* Allocate memory for device */ tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL); @@ -146,6 +146,12 @@ static int ti_tscadc_probe(struct platform_device *pdev) of_property_read_u32(node, "ti,coordiante-readouts", &readouts); if (tscmag_wires) use_tsc = true; + } else { + node = of_get_child_by_name(pdev->dev.of_node, "mag"); + of_property_read_u32(node, "ti,tracks", &mag_tracks); + tscmag_wires = mag_tracks * 2; + if (tscmag_wires) + use_mag = true; } node = of_get_child_by_name(pdev->dev.of_node, "adc"); @@ -206,8 +212,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) * The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK. * ADCs produce a 12-bit sample every 15 ADC_CLK cycles. * am33xx ADCs expect to capture 200ksps. - * We need the ADC clocks to run at 3MHz. - * This frequency is valid since TSC_ADC_SS controller design + * am47xx ADCs expect to capture 867ksps. + * We need ADC clocks respectively running at 3MHz and 13MHz. + * These frequencies are valid since TSC_ADC_SS controller design * assumes the OCP clock is at least 6x faster than the ADC clock. */ clk = devm_clk_get(&pdev->dev, NULL); @@ -231,7 +238,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) else tscadc->ctrl |= CNTRLREG_TSC_4WIRE; } - + } else { + tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN | + CNTRLREG_MAG_PREAMP_BYPASS; } regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); @@ -241,7 +250,7 @@ static int ti_tscadc_probe(struct platform_device *pdev) /* Enable the TSC module enable bit */ regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB); - /* TSC Cell */ + /* TSC or MAG Cell */ if (tscmag_wires > 0) { cell = &tscadc->cells[cell_idx++]; cell->name = tscadc->data->name_tscmag; @@ -329,6 +338,7 @@ static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume); static const struct ti_tscadc_data tscdata = { .has_tsc = true, + .has_mag = false, .name_tscmag = "TI-am335x-tsc", .compat_tscmag = "ti,am3359-tsc", .name_adc = "TI-am335x-adc", @@ -336,8 +346,25 @@ static const struct ti_tscadc_data tscdata = { .target_clk_rate = TSC_ADC_CLK, }; +static const struct ti_tscadc_data magdata = { + .has_tsc = false, + .has_mag = true, + .name_tscmag = "TI-am43xx-mag", + .compat_tscmag = "ti,am4372-mag", + .name_adc = "TI-am43xx-adc", + .compat_adc = "ti,am4372-adc", + .target_clk_rate = MAG_ADC_CLK, +}; + static const struct of_device_id ti_tscadc_dt_ids[] = { - { .compatible = "ti,am3359-tscadc", }, + { + .compatible = "ti,am3359-tscadc", + .data = &tscdata, + }, + { + .compatible = "ti,am4372-magadc", + .data = &magdata, + }, { } }; MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids); @@ -355,6 +382,6 @@ static struct platform_driver ti_tscadc_driver = { module_platform_driver(ti_tscadc_driver); -MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); +MODULE_DESCRIPTION("TI touchscreen/magnetic reader/ADC MFD controller driver"); MODULE_AUTHOR("Rachna Patil "); MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index 082b2af94263..31b22ec567e7 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -129,6 +129,11 @@ #define CNTRLREG_TSC_8WIRE CNTRLREG_TSC_AFE_CTRL(3) #define CNTRLREG_TSC_ENB BIT(7) +/*Control registers bitfields for MAGADC IP */ +#define CNTRLREG_MAGADCENB BIT(0) +#define CNTRLREG_MAG_PREAMP_PWRDOWN BIT(5) +#define CNTRLREG_MAG_PREAMP_BYPASS BIT(6) + /* FIFO READ Register */ #define FIFOREAD_DATA_MASK (0xfff << 0) #define FIFOREAD_CHNLID_MASK (0xf << 16) @@ -141,7 +146,8 @@ #define SEQ_STATUS BIT(5) #define CHARGE_STEP 0x11 -#define TSC_ADC_CLK 3000000 +#define TSC_ADC_CLK 3000000 /* 3 MHz */ +#define MAG_ADC_CLK 13000000 /* 13 MHz */ #define TOTAL_STEPS 16 #define TOTAL_CHANNELS 8 #define FIFO1_THRESHOLD 19 @@ -164,6 +170,7 @@ struct ti_tscadc_data { bool has_tsc; + bool has_mag; char *name_tscmag; char *compat_tscmag; char *name_adc;