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Date: Mon, 10 Jan 2022 11:46:39 +0000
From: Caleb Connolly <caleb.connolly@...aro.org>
To: Jonathan Cameron <jic23@...23.retrosnub.co.uk>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
Rob Herring <robh+dt@...nel.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Lee Jones <lee.jones@...aro.org>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, sumit.semwal@...aro.org,
amit.pundir@...aro.org, john.stultz@...aro.org
Subject: Re: [PATCH v3 1/7] mfd: qcom-spmi-pmic: expose the PMIC revid
information to clients
On 09/01/2022 16:57, Jonathan Cameron wrote:
> On Thu, 6 Jan 2022 17:31:25 +0000
> Caleb Connolly <caleb.connolly@...aro.org> 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.
>>
>> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org>
> Hi Caleb,
>
> Some comments inline.
Hi Jonathan,
Thanks for the feedback, I had a question about one of your points below.
>
> Thanks,
>
> Jonathan
>
>> ---
>> drivers/mfd/qcom-spmi-pmic.c | 108 +++++++++++++++++------------------
>> include/soc/qcom/qcom-pmic.h | 63 ++++++++++++++++++++
>> 2 files changed, 114 insertions(+), 57 deletions(-)
>> create mode 100644 include/soc/qcom/qcom-pmic.h
>>
>> diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c
>> index 1cacc00aa6c9..6b75c2f52b74 100644
>> --- a/drivers/mfd/qcom-spmi-pmic.c
>> +++ b/drivers/mfd/qcom-spmi-pmic.c
>> @@ -3,51 +3,24 @@
>> * Copyright (c) 2014, The Linux Foundation. All rights reserved.
>> */
>>
>> +#include <linux/device.h>
>> +#include <linux/gfp.h>
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> +#include <linux/slab.h>
>> #include <linux/spmi.h>
>> #include <linux/regmap.h>
>> #include <linux/of_platform.h>
>> +#include <soc/qcom/qcom-pmic.h>
>>
>> #define PMIC_REV2 0x101
>> #define PMIC_REV3 0x102
>> #define PMIC_REV4 0x103
>> #define PMIC_TYPE 0x104
>> #define PMIC_SUBTYPE 0x105
>> -
>> +#define PMIC_FAB_ID 0x1f2
>> #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 +54,47 @@ static const struct of_device_id pmic_spmi_id_table[] = {
>> { }
>> };
>>
>> -static void pmic_spmi_show_revid(struct regmap *map, struct device *dev)
>> +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);
>
> Managed allocation that you call kfree on in remove().
>
>>
>> - 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;
>> +
>> + if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) {
>> + ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id);
>> + if (ret < 0)
>> + return ret;
>> + }
>>
>> /*
>> * In early versions of PM8941 and PM8226, the major revision number
>> @@ -124,14 +102,14 @@ 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 (subtype == PM8110_SUBTYPE)
>> - minor = rev2;
>> + if (pmic->subtype == PM8110_SUBTYPE)
>> + pmic->minor = pmic->rev2;
>>
>> - dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor);
>> + return 0;
>> }
>>
>> static const struct regmap_config spmi_regmap_config = {
>> @@ -144,22 +122,38 @@ 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;
>>
>> 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;
>
> Within the code visible here, why can't this just be on the stack?
I allocated on the heap beacuse the data has to be read by other drivers
(it's handed over in spmi_device_set_drvdata() below). I don't have a
whole lot of C experience so please forgive the potentially ignorant
questions - is it ok to allocate on the stack if the object needs to
have a lifetime longer than the function?
>
>> +
>> /* 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) {
>> + pmic_spmi_load_revid(regmap, &sdev->dev, pmic);
>> + spmi_device_set_drvdata(sdev, pmic);
>> + qcom_pmic_print_info(&sdev->dev, pmic);
>> + }
>>
>> return devm_of_platform_populate(&sdev->dev);
>> }
>>
>> +static void pmic_spmi_remove(struct spmi_device *sdev)
>> +{
>> + struct qcom_spmi_pmic *pmic = spmi_device_get_drvdata(sdev);
>> +
>> + kfree(pmic->name);
>
> Looks like this is cleaning up a managed allocation unless I'm missing something
> which means you'll get a double free on remove.
>
>> +}
>> +
>> MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
>>
>> static struct spmi_driver pmic_spmi_driver = {
>> .probe = pmic_spmi_probe,
>> + .remove = pmic_spmi_remove,
>> .driver = {
>> .name = "pmic-spmi",
>> .of_match_table = pmic_spmi_id_table,
>> diff --git a/include/soc/qcom/qcom-pmic.h b/include/soc/qcom/qcom-pmic.h
>> new file mode 100644
>> index 000000000000..59114988582d
>> --- /dev/null
>> +++ b/include/soc/qcom/qcom-pmic.h
>> @@ -0,0 +1,63 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/* Copyright (c) 2021 Linaro. All rights reserved.
>> + * Copyright (c) 2021 Caleb Connolly <caleb.connolly@...aro.org>
>> + */
>> +
>> +#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;
>> + unsigned int fab_id;
>> + const char *name;
>> +};
>> +
> struct device;
>
>> +static inline void qcom_pmic_print_info(struct device *dev, struct qcom_spmi_pmic *pmic)
>> +{
>
> Need an include to get you access to dev_info() and possibly so
>
> Headers should stand and build on their own including any inline functions they
> contain.
>
>
>> + dev_info(dev, "%x: %s v%d.%d\n",
>> + pmic->subtype, pmic->name, pmic->major, pmic->minor);
>> +}
>> +
>> +#endif /* __QCOM_PMIC_H__ */
>
--
Kind Regards,
Caleb (they/them)
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