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Date: Tue, 04 Nov 2014 17:06:12 +0200
From: Stanimir Varbanov <svarbanov@...sol.com>
To: "Ivan T. Ivanov" <iivanov@...sol.com>
CC: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] mfd: qcom-spmi-pmic: Add support for more chips versions
Hi Ivan,
Thanks for the patch!
On 11/04/2014 03:33 PM, Ivan T. Ivanov wrote:
> Update compatible string with runtime detected chip revision
> information, for example qcom,pm8941 will become qcom,pm8941-v1.0.
>
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
> .../devicetree/bindings/mfd/qcom,spmi-pmic.txt | 18 ++-
> drivers/mfd/qcom-spmi-pmic.c | 142 +++++++++++++++++++++
> 2 files changed, 156 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt b/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt
> index 7182b88..bbe7db8 100644
> --- a/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt
> +++ b/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt
> @@ -15,10 +15,20 @@ each. A function can consume one or more of these fixed-size register regions.
>
> Required properties:
> - compatible: Should contain one of:
> - "qcom,pm8941"
> - "qcom,pm8841"
> - "qcom,pma8084"
> - or generalized "qcom,spmi-pmic".
> + qcom,pm8941,
> + qcom,pm8841,
> + qcom,pm8019,
> + qcom,pm8226,
> + qcom,pm8110,
> + qcom,pma8084,
> + qcom,pmi8962,
> + qcom,pmd9635,
> + qcom,pm8994,
> + qcom,pmi8994,
> + qcom,pm8916,
> + qcom,pm8004,
> + qcom,pm8909,
> + or generalized "qcom,spmi-pmic".
> - reg: Specifies the SPMI USID slave address for this device.
> For more information see:
> Documentation/devicetree/bindings/spmi/spmi.txt
> diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c
> index 4b8beb2..67446a4 100644
> --- a/drivers/mfd/qcom-spmi-pmic.c
> +++ b/drivers/mfd/qcom-spmi-pmic.c
> @@ -13,10 +13,126 @@
>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/slab.h>
> #include <linux/spmi.h>
> #include <linux/regmap.h>
> +#include <linux/of.h>
> #include <linux/of_platform.h>
>
> +#define PMIC_REV2 0x101
> +#define PMIC_REV3 0x102
> +#define PMIC_REV4 0x103
> +#define PMIC_TYPE 0x104
> +#define PMIC_SUBTYPE 0x105
> +
> +#define PMIC_TYPE_VALUE 0x51
> +
> +#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
> +
> +static int pmic_spmi_read_revid(struct regmap *map, char **name,
> + int *major, int *minor)
> +{
> + unsigned int rev2, rev3, rev4, type, subtype;
> + int ret;
> +
> + ret = regmap_read(map, PMIC_TYPE, &type);
> + if (ret < 0)
> + return ret;
> +
> + if (type != PMIC_TYPE_VALUE)
> + return -EINVAL;
> +
> + ret = regmap_read(map, PMIC_SUBTYPE, &subtype);
> + if (ret < 0)
> + return ret;
> +
> + rev2 = regmap_read(map, PMIC_REV2, &rev2);
> + if (ret < 0)
> + return ret;
> +
> + rev3 = regmap_read(map, PMIC_REV3, &rev3);
> + if (ret < 0)
> + return ret;
> +
> + rev4 = regmap_read(map, PMIC_REV4, &rev4);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * In early versions of PM8941 and PM8226, the major revision number
> + * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
> + * Increment the major revision number here if the chip is an early
> + * version of PM8941 or PM8226.
> + */
> + if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) &&
> + rev4 < 0x02)
> + rev4++;
> +
> + *major = rev4;
> + if (subtype == PM8110_SUBTYPE)
> + *minor = rev2;
> + else
> + *minor = rev3;
> +
> + switch (subtype) {
> + case PM8941_SUBTYPE:
> + *name = "pm8941";
> + break;
The XXX_SUBTYPE seems are continuous why not make it an const array and
get the name by index in this array?
> + case PM8841_SUBTYPE:
> + *name = "pm8841";
> + break;
> + case PM8019_SUBTYPE:
> + *name = "pm8019";
> + break;
> + case PM8226_SUBTYPE:
> + *name = "pm8226";
> + break;
> + case PM8110_SUBTYPE:
> + *name = "pm8110";
> + break;
> + case PMA8084_SUBTYPE:
> + *name = "pma8084";
> + break;
> + case PMI8962_SUBTYPE:
> + *name = "pmi8962";
> + break;
> + case PMD9635_SUBTYPE:
> + *name = "pmd8635";
> + break;
> + case PM8994_SUBTYPE:
> + *name = "pm8994";
> + break;
> + case PMI8994_SUBTYPE:
> + *name = "pmi8994";
> + break;
> + case PM8916_SUBTYPE:
> + *name = "pm8916";
> + break;
> + case PM8004_SUBTYPE:
> + *name = "pm8004";
> + break;
> + case PM8909_SUBTYPE:
> + *name = "pm8909";
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static const struct regmap_config spmi_regmap_config = {
> .reg_bits = 16,
> .val_bits = 8,
> @@ -28,11 +144,27 @@ static int pmic_spmi_probe(struct spmi_device *sdev)
> {
> struct device_node *root = sdev->dev.of_node;
> struct regmap *regmap;
> + struct property *prop;
> + int major, minor, ret;
> + char *name, compatible[32];
>
> regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
> if (IS_ERR(regmap))
> return PTR_ERR(regmap);
>
> + ret = pmic_spmi_read_revid(regmap, &name, &major, &minor);
> + if (!ret) {
Are you sure that we want to continue if we can't read the revision id
and therefore will not be able to construct properly the compatible
property?
> + snprintf(compatible, ARRAY_SIZE(compatible), "qcom,%s-v%d.%d",
> + name, major, minor);
> + prop = kzalloc(sizeof(*prop), GFP_KERNEL);
> + if (prop) {
> + prop->name = kstrdup("compatible", GFP_KERNEL);
> + prop->value = kstrdup(compatible, GFP_KERNEL);
> + prop->length = strlen(prop->value);
> + of_update_property(root, prop);
of_update_property can fail, check the returned value.
<snip>
--
regards,
Stan
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