From patchwork Wed Aug 17 05:43:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eliav Farber X-Patchwork-Id: 12945485 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76E0EC25B08 for ; Wed, 17 Aug 2022 05:44:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238706AbiHQFot (ORCPT ); Wed, 17 Aug 2022 01:44:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238707AbiHQFoP (ORCPT ); Wed, 17 Aug 2022 01:44:15 -0400 Received: from smtp-fw-6002.amazon.com (smtp-fw-6002.amazon.com [52.95.49.90]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 088E07CB50; Tue, 16 Aug 2022 22:43:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1660715038; x=1692251038; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zDa/OToZ/vYiAzKBvDIfF4630+PtGKDsU6JSOj2YYVc=; b=qDRlQpZ088xOdvaptCHrNGt0E/QR5idS1h9HDwWwFMhFolvoPiIHREbV 5QKnJ56qm91Hcq7bBO5/d2Eec7rnYO4xE1wcWm5ShbJnIeYFMbMAA4/i1 EdVgUrPBYxOTXJ5Gjxt8xWTX1CoJO5fLyKuGXs+56d78nNPGpU1aN7SmH o=; X-IronPort-AV: E=Sophos;i="5.93,242,1654560000"; d="scan'208";a="233936718" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-iad-1a-c92fe759.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-6002.iad6.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2022 05:43:46 +0000 Received: from EX13MTAUWA001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan2.iad.amazon.com [10.40.163.34]) by email-inbound-relay-iad-1a-c92fe759.us-east-1.amazon.com (Postfix) with ESMTPS id 45499C08A4; Wed, 17 Aug 2022 05:43:44 +0000 (UTC) Received: from EX19D013UWA002.ant.amazon.com (10.13.138.210) by EX13MTAUWA001.ant.amazon.com (10.43.160.118) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Wed, 17 Aug 2022 05:43:23 +0000 Received: from EX13MTAUWA001.ant.amazon.com (10.43.160.58) by EX19D013UWA002.ant.amazon.com (10.13.138.210) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.12; Wed, 17 Aug 2022 05:43:22 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by mail-relay.amazon.com (10.43.160.118) with Microsoft SMTP Server id 15.0.1497.38 via Frontend Transport; Wed, 17 Aug 2022 05:43:22 +0000 Received: by dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (Postfix, from userid 14301484) id 8A3C24C6A; Wed, 17 Aug 2022 05:43:21 +0000 (UTC) From: Eliav Farber To: , , , , , , CC: , , , , , , , , , , , , Subject: [PATCH v2 10/16] hwmon: (mr75203) add VM pre-scalar support Date: Wed, 17 Aug 2022 05:43:15 +0000 Message-ID: <20220817054321.6519-11-farbere@amazon.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220817054321.6519-1-farbere@amazon.com> References: <20220817054321.6519-1-farbere@amazon.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Add pre-scalar support to normalzie the voltage output results for channels the use pre-scalar units to get the measurement to be within the range that the sensor supports. The pre-scalar value is used if it exists in device-tree, otherwise default value of 1 is used. Signed-off-by: Eliav Farber --- drivers/hwmon/mr75203.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c index 2e6139c09efc..24a00339cfd8 100644 --- a/drivers/hwmon/mr75203.c +++ b/drivers/hwmon/mr75203.c @@ -112,8 +112,12 @@ struct voltage_device { u8 vm_map; u8 ch_map; + u32 pre_scaler; }; +#define PRE_SCALR_PROPERTY_NAME 32 +#define PRE_SCALR_DEFAULT_VAL 1 + struct pvt_device { struct regmap *c_map; struct regmap *t_map; @@ -215,7 +219,9 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val) n &= SAMPLE_DATA_MSK; /* Convert the N bitstream count into voltage */ - *val = (PVT_N_CONST * n - PVT_R_CONST) >> PVT_CONV_BITS; + *val = pvt->vd[channel].pre_scaler; + *val *= (PVT_N_CONST * n - PVT_R_CONST); + *val >>= PVT_CONV_BITS; return 0; default: @@ -527,6 +533,7 @@ static int pvt_reset_control_deassert(struct device *dev, struct pvt_device *pvt static int mr75203_probe(struct platform_device *pdev) { const struct hwmon_channel_info **pvt_info; + const struct device_node *np = pdev->dev.of_node; u32 ts_num, vm_num, pd_num, ch_num, val, index, i, j, k; struct device *dev = &pdev->dev; u32 *temp_config, *in_config; @@ -552,7 +559,7 @@ static int mr75203_probe(struct platform_device *pdev) return ret; } - if (of_property_read_bool(dev->of_node, "reset-control-skip")) { + if (of_property_read_bool(np, "reset-control-skip")) { dev_info(dev, "skipping reset-control\n"); } else { pvt->rst = devm_reset_control_get_exclusive(dev, NULL); @@ -615,6 +622,8 @@ static int mr75203_probe(struct platform_device *pdev) if (vm_num) { u8 vm_idx[VM_NUM_MAX]; u8 vm_active_ch[VM_NUM_MAX]; + char prop_name[PRE_SCALR_PROPERTY_NAME] = {0}; + u32 pre_scaler; ret = pvt_get_regmap(pdev, "vm", pvt); if (ret) @@ -686,6 +695,21 @@ static int mr75203_probe(struct platform_device *pdev) k++; } + /* + * Incase vm-pre-scalar-ch# property is not defined, we assume + * default pre-scaler of 1. + */ + for (i = 0; i < pvt->vm_ch_total; i++) { + snprintf(prop_name, sizeof(prop_name), + "vm-pre-scalar-ch%u", i); + + ret = of_property_read_u32(np, prop_name, &pre_scaler); + if (ret) + pvt->vd[i].pre_scaler = PRE_SCALR_DEFAULT_VAL; + else + pvt->vd[i].pre_scaler = pre_scaler; + } + in_config = devm_kcalloc(dev, pvt->vm_ch_total + 1, sizeof(*in_config), GFP_KERNEL); if (!in_config)