Re: [PATCH v8 2/9] mfd: qcom-spmi-pmic: expose the PMIC revid information to clients

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On Tue, 22 Feb 2022 at 01:08, Caleb Connolly <caleb.connolly@xxxxxxxxxx> 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 <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Caleb Connolly <caleb.connolly@xxxxxxxxxx>
> ---
>  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 <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/gfp.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/spmi.h>
> +#include <linux/types.h>
>  #include <linux/regmap.h>
>  #include <linux/of_platform.h>
> +#include <soc/qcom/qcom-spmi-pmic.h>
>
>  #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
> +        * PMIC with more than 2 USIDs. We know that function_parent_usid
> +        * is one greater than the base USID.
> +        */

I think this is not correct for newer platforms. On SM8450 we have
PMICs which do not share a pair of USIDs.
For example on sm8450-qrd:

PMK8350 @ 0
PM8350 @ 1
PM8350C @ 2
PM8350B @ 3
PMR735A @ 4
PMR735B @ 5
PM8450 @ 7

> +       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 <caleb.connolly@xxxxxxxxxx>
> + */
> +
> +#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__ */
> --
> 2.35.1
>


-- 
With best wishes
Dmitry



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