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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC36FC433FE for ; Sat, 26 Feb 2022 17:05:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231722AbiBZRFf (ORCPT ); Sat, 26 Feb 2022 12:05:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229924AbiBZRFf (ORCPT ); Sat, 26 Feb 2022 12:05:35 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 107FD106B04; Sat, 26 Feb 2022 09:05:00 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 99F8E60C86; Sat, 26 Feb 2022 17:04:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FA92C340E8; Sat, 26 Feb 2022 17:04:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645895099; bh=g7yo3fMuqJTQ1SHGCREG0ls4yeOh0MQ0TqRbYe1i/cw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=BxzDkYNYu3oh4WTcVLbiqWNDxHytoQ2IcMez4PIDiSC9Wz4JJUg1yO9Wj3sGC5ERh JgQH7VCKCIWKBGf2Y+HRw3oqPbh+aJdtrRigZOULUQ/3IIpUARy6YNfdrP74QE+Vkc e5/H8YTpKCynsDt/bm4QaVONsEXCFXfbNPkYag3sii9UYNSsqp+cfngOIsJSrMGNqn 7+gcBcY9mFiMB2RqMuEvO39L3JtM+PDReeCUJe1CAfxUlvfA9JkoNUU+caFe90i+DJ jVq6QFt6B4s6zco4LHxn9hcVmG2jzCnKnl1/PHLbJGAhWOPtudSGfx5pI3yiroG/Ve 0fzvSGYsYSUrA== Date: Sat, 26 Feb 2022 17:11:58 +0000 From: Jonathan Cameron To: Caleb Connolly Cc: Lars-Peter Clausen , Rob Herring , Andy Gross , Bjorn Andersson , Lee Jones , Stephen Boyd , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, sumit.semwal@linaro.org, amit.pundir@linaro.org, john.stultz@linaro.org, kernel test robot , Dan Carpenter Subject: Re: [PATCH v8 2/9] mfd: qcom-spmi-pmic: expose the PMIC revid information to clients Message-ID: <20220226171158.4ced99d7@jic23-huawei> In-Reply-To: <20220221220743.541704-3-caleb.connolly@linaro.org> References: <20220221220743.541704-1-caleb.connolly@linaro.org> <20220221220743.541704-3-caleb.connolly@linaro.org> X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Mon, 21 Feb 2022 22:07:36 +0000 Caleb Connolly wrote: > Some PMIC functions such as the RRADC need to be aware of the PMIC > chip revision information to implement errata or otherwise adjust > behaviour, export the PMIC information to enable this. > > This is specifically required to enable the RRADC to adjust > coefficients based on which chip fab the PMIC was produced in, > this can vary per unique device and therefore has to be read at > runtime. > > [bugs in previous revision] > Reported-by: kernel test robot > Reported-by: Dan Carpenter > Signed-off-by: Caleb Connolly Hi Caleb, One trivial question about a comment below. Otherwise, looking for mfd ack from Lee. Is anyone actively maintaining mfd/qcom-spmi-pmic.c? If some one at least familiar with that code (Bjorn or Stephen maybe?) could take a quick look that would also be great. Thanks, Jonathan > --- > drivers/mfd/qcom-spmi-pmic.c | 174 ++++++++++++++++++++---------- > include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++++++ > 2 files changed, 178 insertions(+), 56 deletions(-) > create mode 100644 include/soc/qcom/qcom-spmi-pmic.h > > diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c > index 1cacc00aa6c9..1ef426a1513b 100644 > --- a/drivers/mfd/qcom-spmi-pmic.c > +++ b/drivers/mfd/qcom-spmi-pmic.c > @@ -3,11 +3,16 @@ > * Copyright (c) 2014, The Linux Foundation. All rights reserved. > */ > > +#include > +#include > +#include > #include > #include > #include > +#include > #include > #include > +#include > > #define PMIC_REV2 0x101 > #define PMIC_REV3 0x102 > @@ -17,37 +22,6 @@ > > #define PMIC_TYPE_VALUE 0x51 > > -#define COMMON_SUBTYPE 0x00 > -#define PM8941_SUBTYPE 0x01 > -#define PM8841_SUBTYPE 0x02 > -#define PM8019_SUBTYPE 0x03 > -#define PM8226_SUBTYPE 0x04 > -#define PM8110_SUBTYPE 0x05 > -#define PMA8084_SUBTYPE 0x06 > -#define PMI8962_SUBTYPE 0x07 > -#define PMD9635_SUBTYPE 0x08 > -#define PM8994_SUBTYPE 0x09 > -#define PMI8994_SUBTYPE 0x0a > -#define PM8916_SUBTYPE 0x0b > -#define PM8004_SUBTYPE 0x0c > -#define PM8909_SUBTYPE 0x0d > -#define PM8028_SUBTYPE 0x0e > -#define PM8901_SUBTYPE 0x0f > -#define PM8950_SUBTYPE 0x10 > -#define PMI8950_SUBTYPE 0x11 > -#define PM8998_SUBTYPE 0x14 > -#define PMI8998_SUBTYPE 0x15 > -#define PM8005_SUBTYPE 0x18 > -#define PM660L_SUBTYPE 0x1A > -#define PM660_SUBTYPE 0x1B > -#define PM8150_SUBTYPE 0x1E > -#define PM8150L_SUBTYPE 0x1f > -#define PM8150B_SUBTYPE 0x20 > -#define PMK8002_SUBTYPE 0x21 > -#define PM8009_SUBTYPE 0x24 > -#define PM8150C_SUBTYPE 0x26 > -#define SMB2351_SUBTYPE 0x29 > - > static const struct of_device_id pmic_spmi_id_table[] = { > { .compatible = "qcom,pm660", .data = (void *)PM660_SUBTYPE }, > { .compatible = "qcom,pm660l", .data = (void *)PM660L_SUBTYPE }, > @@ -81,42 +55,118 @@ static const struct of_device_id pmic_spmi_id_table[] = { > { } > }; > > -static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) > +/** > + * qcom_pmic_get() - Get a pointer to the base PMIC device > + * > + * @dev: the pmic function device > + * @return: the struct qcom_spmi_pmic* pointer associated with the function device > + * > + * A PMIC can be represented by multiple SPMI devices, but > + * only the base PMIC device will contain a reference to > + * the revision information. > + * > + * This function takes a pointer to a function device and > + * returns a pointer to the base PMIC device. > + */ > +const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) > +{ > + struct spmi_device *sdev; > + struct device_node *spmi_bus; > + struct device_node *other_usid = NULL; > + int function_parent_usid, ret; > + u32 reg[2]; > + > + if (!of_match_device(pmic_spmi_id_table, dev->parent)) > + return ERR_PTR(-EINVAL); > + > + sdev = to_spmi_device(dev->parent); > + if (!sdev) > + return ERR_PTR(-EINVAL); > + > + /* > + * Quick return if the function device is already in the right > + * USID > + */ > + if (sdev->usid % 2 == 0) > + return spmi_device_get_drvdata(sdev); > + > + function_parent_usid = sdev->usid; > + > + /* > + * Walk through the list of PMICs until we find the sibling USID. > + * The goal is the find to previous sibling. Assuming there is no Probably: The goal is to find the previous sibling. ? > + * PMIC with more than 2 USIDs. We know that function_parent_usid > + * is one greater than the base USID. > + */ > + spmi_bus = of_get_parent(sdev->dev.parent->of_node); > + do { > + other_usid = of_get_next_child(spmi_bus, other_usid); > + ret = of_property_read_u32_array(other_usid, "reg", reg, 2); > + if (ret) > + return ERR_PTR(ret); > + sdev = spmi_device_from_of(other_usid); > + if (sdev == NULL) { > + /* > + * If the base USID for this PMIC hasn't probed yet > + * but the secondary USID has, then we need to defer > + * the function driver so that it will attempt to > + * probe again when the base USID is ready. > + */ > + if (reg[0] == function_parent_usid - 1) > + return ERR_PTR(-EPROBE_DEFER); > + > + continue; > + } > + > + if (reg[0] == function_parent_usid - 1) > + return spmi_device_get_drvdata(sdev); > + } while (other_usid->sibling); > + > + return ERR_PTR(-ENODATA); > +} > +EXPORT_SYMBOL(qcom_pmic_get); > + > +static inline void pmic_print_info(struct device *dev, struct qcom_spmi_pmic *pmic) > +{ > + dev_dbg(dev, "%x: %s v%d.%d\n", > + pmic->subtype, pmic->name, pmic->major, pmic->minor); > +} > + > +static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, > + struct qcom_spmi_pmic *pmic) > { > - unsigned int rev2, minor, major, type, subtype; > - const char *name = "unknown"; > int ret, i; > > - ret = regmap_read(map, PMIC_TYPE, &type); > + ret = regmap_read(map, PMIC_TYPE, &pmic->type); > if (ret < 0) > - return; > + return ret; > > - if (type != PMIC_TYPE_VALUE) > - return; > + if (pmic->type != PMIC_TYPE_VALUE) > + return ret; > > - ret = regmap_read(map, PMIC_SUBTYPE, &subtype); > + ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); > if (ret < 0) > - return; > + return ret; > > for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) { > - if (subtype == (unsigned long)pmic_spmi_id_table[i].data) > + if (pmic->subtype == (unsigned long)pmic_spmi_id_table[i].data) > break; > } > > if (i != ARRAY_SIZE(pmic_spmi_id_table)) > - name = pmic_spmi_id_table[i].compatible; > + pmic->name = devm_kstrdup_const(dev, pmic_spmi_id_table[i].compatible, GFP_KERNEL); > > - ret = regmap_read(map, PMIC_REV2, &rev2); > + ret = regmap_read(map, PMIC_REV2, &pmic->rev2); > if (ret < 0) > - return; > + return ret; > > - ret = regmap_read(map, PMIC_REV3, &minor); > + ret = regmap_read(map, PMIC_REV3, &pmic->minor); > if (ret < 0) > - return; > + return ret; > > - ret = regmap_read(map, PMIC_REV4, &major); > + ret = regmap_read(map, PMIC_REV4, &pmic->major); > if (ret < 0) > - return; > + return ret; > > /* > * In early versions of PM8941 and PM8226, the major revision number > @@ -124,14 +174,16 @@ static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) > * Increment the major revision number here if the chip is an early > * version of PM8941 or PM8226. > */ > - if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) && > - major < 0x02) > - major++; > + if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && > + pmic->major < 0x02) > + pmic->major++; > + > + if (pmic->subtype == PM8110_SUBTYPE) > + pmic->minor = pmic->rev2; > > - if (subtype == PM8110_SUBTYPE) > - minor = rev2; > + pmic_print_info(dev, pmic); > > - dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor); > + return 0; > } > > static const struct regmap_config spmi_regmap_config = { > @@ -144,14 +196,24 @@ static const struct regmap_config spmi_regmap_config = { > static int pmic_spmi_probe(struct spmi_device *sdev) > { > struct regmap *regmap; > + struct qcom_spmi_pmic *pmic; > + int ret; > > regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); > if (IS_ERR(regmap)) > return PTR_ERR(regmap); > > + pmic = devm_kzalloc(&sdev->dev, sizeof(*pmic), GFP_KERNEL); > + if (!pmic) > + return -ENOMEM; > + > /* Only the first slave id for a PMIC contains this information */ > - if (sdev->usid % 2 == 0) > - pmic_spmi_show_revid(regmap, &sdev->dev); > + if (sdev->usid % 2 == 0) { > + ret = pmic_spmi_load_revid(regmap, &sdev->dev, pmic); > + if (ret < 0) > + return ret; > + spmi_device_set_drvdata(sdev, pmic); > + } > > return devm_of_platform_populate(&sdev->dev); > } > diff --git a/include/soc/qcom/qcom-spmi-pmic.h b/include/soc/qcom/qcom-spmi-pmic.h > new file mode 100644 > index 000000000000..a8a77be22cfc > --- /dev/null > +++ b/include/soc/qcom/qcom-spmi-pmic.h > @@ -0,0 +1,60 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* Copyright (c) 2021 Linaro. All rights reserved. > + * Copyright (c) 2021 Caleb Connolly > + */ > + > +#ifndef __QCOM_PMIC_H__ > +#define __QCOM_PMIC_H__ > + > +#define COMMON_SUBTYPE 0x00 > +#define PM8941_SUBTYPE 0x01 > +#define PM8841_SUBTYPE 0x02 > +#define PM8019_SUBTYPE 0x03 > +#define PM8226_SUBTYPE 0x04 > +#define PM8110_SUBTYPE 0x05 > +#define PMA8084_SUBTYPE 0x06 > +#define PMI8962_SUBTYPE 0x07 > +#define PMD9635_SUBTYPE 0x08 > +#define PM8994_SUBTYPE 0x09 > +#define PMI8994_SUBTYPE 0x0a > +#define PM8916_SUBTYPE 0x0b > +#define PM8004_SUBTYPE 0x0c > +#define PM8909_SUBTYPE 0x0d > +#define PM8028_SUBTYPE 0x0e > +#define PM8901_SUBTYPE 0x0f > +#define PM8950_SUBTYPE 0x10 > +#define PMI8950_SUBTYPE 0x11 > +#define PM8998_SUBTYPE 0x14 > +#define PMI8998_SUBTYPE 0x15 > +#define PM8005_SUBTYPE 0x18 > +#define PM660L_SUBTYPE 0x1A > +#define PM660_SUBTYPE 0x1B > +#define PM8150_SUBTYPE 0x1E > +#define PM8150L_SUBTYPE 0x1f > +#define PM8150B_SUBTYPE 0x20 > +#define PMK8002_SUBTYPE 0x21 > +#define PM8009_SUBTYPE 0x24 > +#define PM8150C_SUBTYPE 0x26 > +#define SMB2351_SUBTYPE 0x29 > + > +#define PMI8998_FAB_ID_SMIC 0x11 > +#define PMI8998_FAB_ID_GF 0x30 > + > +#define PM660_FAB_ID_GF 0x0 > +#define PM660_FAB_ID_TSMC 0x2 > +#define PM660_FAB_ID_MX 0x3 > + > +struct qcom_spmi_pmic { > + unsigned int type; > + unsigned int subtype; > + unsigned int major; > + unsigned int minor; > + unsigned int rev2; > + const char *name; > +}; > + > +struct device; > + > +const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev); > + > +#endif /* __QCOM_PMIC_H__ */