regulator: cpr-regulator: Add support for fuse based quotient offset

				applied unconditionally.  This property can be used to add or subtract

				static initial voltage margin from the regulator managed by the CPR

				controller.

- qcom,cpr-quot-offset-adjustment:	Array of integer tuples of target quotient offset adjustments to add

				to the fused quotient offsets of each fuse corner. The elements in a tuple

				are ordered from lowest voltage corner to highest voltage corner. Each tuple

				must be of length defined by qcom,cpr-fuse-corners. If the qcom,cpr-fuse-version-map

				property is specified, then qcom,cpr-quot-offset-adjustment must contain the

				same number of tuples as qcom,cpr-fuse-version-map.  These tuples are then

				mapped one-to-one in the order specified.  E.g. if the second

				qcom,cpr-fuse-version-map tuple matches for a given device, then the quotient

				offset adjustments defined in the second qcom,cpr-quot-offset-adjustment tuple

				will be applied. If the qcom,cpr-fuse-version-map property is not specified,

				then qcom,cpr-quot-offset-adjustment must contain a single tuple which is then

				applied unconditionally.  If this property is specified, then the quotient

				offset adjustment values are added to the target quotient offset values read

				from fuses.

				This property can be used to add or subtract static quotient offset margin from

				the regulator managed by the CPR controller.

- qcom,cpr-clamp-timer-interval:	The number of 64 reference clock cycle blocks to delay for whenever

					the clamp signal, sensor mask registers or sensor bypass registers

					change.  The CPR controller loop is disabled during this delay.

- qcom,cpr-quot-min-diff:	Integer which defines the minimum target-quotient difference between

				the highest and (highest - 1) fuse corner to keep CPR enabled. If this

				property is not specified a default value of 50 is used.

- qcom,cpr-fuse-quot-offset:	Array of quadruples in which each quadruple specifies a fuse location to

				read in order to get the quotient offset for a fuse corner. The fuse values

				are encoded as the difference between quotients of that fuse corner and its

				adjacent lower fuse corner divided by an unpacking multiplier.

				At present, the multiplier is assumed to be same as that of the value defined

				under qcom,cpr-fuse-target-quot-scale.

				The 4 elements in one quadruple are:

				[0]: => the fuse row number of the bits

				[1]: => LSB bit position of the bits

				[2]: => number of the bits

				[3]: => fuse reading method, 0 for direct reading or 1 for SCM reading

				The quadruples are ordered from the lowest fuse corner to the highest

				fuse corner.

				Quotient offset read from the fuse locations above can be overridden with

				the property qcom,cpr-quot-adjust-scaling-factor-max.

- qcom,cpr-redun-fuse-quot-offset: Array of quadruples in which each quadruple specifies a fuse location to

				read in order to get the redundant quotient offset for a fuse corner. This

				property is the same as qcom,cpr-fuse-quot-offset except that it is only

				utilized if a chip is configured to use the redundant set of fuse values.

Example:

	apc_vreg_corner: regulator@f9018000 {

				<0 1>,

				<0 1>;

		qcom,cpr-quot-adjust-scaling-factor-max = <0 650 650>;

		qcom,cpr-fuse-quot-offset =

				<138 53 5 0>,

				<138 53 5 0>,

				<138 48 5 0>,

				<138 58 5 0>;

		qcom,cpr-fuse-redun-quot-offset =

				<200 53 5 0>,

				<200 53 5 0>,

				<200 48 5 0>,

				<200 58 5 0>;

		qcom,cpr-fuse-init-voltage =

				<27 36 6 0>,

				<27 18 6 0>,

				<0 0 (-210)>,

				<0 0 (-60)>,

				<0 0 (-94)>;

		qcom,cpr-quot-offset-adjustment =

				<0 0 (-5)>;

		qcom,cpr-init-voltage-adjustment =

				<0 0 (-100000)>,

				<0 0 (-100000)>,

	int quot_adjust;

};

struct cpr_quot_scale {

	u32 offset;

	u32 multiplier;

};

static const char * const vdd_apc_name[] =	{"vdd-apc-optional-prim",

						"vdd-apc-optional-sec",

						"vdd-apc"};

	int		cpr_fuse_map_match;

	int		*cpr_fuse_target_quot;

	int		*cpr_fuse_ro_sel;

	int		*fuse_quot_offset;

	int		gcnt;

	unsigned int	cpr_irq;

	return 0;

}

static int cpr_adjust_target_quot_offsets(struct platform_device *pdev,

					struct cpr_regulator *cpr_vreg)

{

	struct device_node *of_node = pdev->dev.of_node;

	int tuple_count, tuple_match, i;

	u32 index;

	u32 quot_offset_adjust = 0;

	int len = 0;

	int rc = 0;

	char *quot_offset_str;

	quot_offset_str = "qcom,cpr-quot-offset-adjustment";

	if (!of_find_property(of_node, quot_offset_str, &len)) {

		/* No static quotient adjustment needed. */

		return 0;

	}

	if (cpr_vreg->cpr_fuse_map_count) {

		if (cpr_vreg->cpr_fuse_map_match == FUSE_MAP_NO_MATCH) {

			/* No matching index to use for quotient adjustment. */

			return 0;

		}

		tuple_count = cpr_vreg->cpr_fuse_map_count;

		tuple_match = cpr_vreg->cpr_fuse_map_match;

	} else {

		tuple_count = 1;

		tuple_match = 0;

	}

	if (len != cpr_vreg->num_fuse_corners * tuple_count * sizeof(u32)) {

		cpr_err(cpr_vreg, "%s length=%d is invalid\n", quot_offset_str,

			len);

		return -EINVAL;

	}

	for (i = CPR_FUSE_CORNER_MIN; i <= cpr_vreg->num_fuse_corners; i++) {

		index = tuple_match * cpr_vreg->num_fuse_corners

				+ i - CPR_FUSE_CORNER_MIN;

		rc = of_property_read_u32_index(of_node, quot_offset_str, index,

			&quot_offset_adjust);

		if (rc) {

			cpr_err(cpr_vreg, "could not read %s index %u, rc=%d\n",

				quot_offset_str, index, rc);

			return rc;

		}

		if (quot_offset_adjust) {

			cpr_vreg->fuse_quot_offset[i] += quot_offset_adjust;

			cpr_info(cpr_vreg, "Corner[%d]: adjusted target quot = %d\n",

				i, cpr_vreg->fuse_quot_offset[i]);

		}

	}

	return rc;

}

static int cpr_get_fuse_quot_offset(struct cpr_regulator *cpr_vreg,

					struct platform_device *pdev,

					struct cpr_quot_scale *quot_scale)

{

	struct device *dev = &pdev->dev;

	struct property *prop;

	u32 *fuse_sel, *tmp;

	int rc = 0, i, size;

	char *quot_offset_str;

	quot_offset_str = cpr_vreg->cpr_fuse_redundant

			? "qcom,cpr-fuse-redun-quot-offset"

			: "qcom,cpr-fuse-quot-offset";

	prop = of_find_property(dev->of_node, quot_offset_str, NULL);

	if (!prop) {

		cpr_debug(cpr_vreg, "%s not present\n", quot_offset_str);

		return 0;

	} else {

		size = prop->length / sizeof(u32);

		if (size != cpr_vreg->num_fuse_corners * 4) {

			cpr_err(cpr_vreg, "fuse position for quot offset is invalid\n");

			return -EINVAL;

		}

	}

	fuse_sel = kzalloc(sizeof(u32) * size, GFP_KERNEL);

	if (!fuse_sel) {

		cpr_err(cpr_vreg, "memory alloc failed.\n");

		return -ENOMEM;

	}

	rc = of_property_read_u32_array(dev->of_node, quot_offset_str,

			fuse_sel, size);

	if (rc < 0) {

		cpr_err(cpr_vreg, "read %s failed, rc = %d\n", quot_offset_str,

			rc);

		kfree(fuse_sel);

		return rc;

	}

	cpr_vreg->fuse_quot_offset = devm_kzalloc(dev,

			sizeof(u32) * (cpr_vreg->num_corners + 1),

			GFP_KERNEL);

	if (!cpr_vreg->fuse_quot_offset) {

		cpr_err(cpr_vreg, "Can't allocate memory for cpr_vreg->fuse_quot_offset\n");

		kfree(fuse_sel);

		return -ENOMEM;

	}

	tmp = fuse_sel;

	for (i = CPR_FUSE_CORNER_MIN; i <= cpr_vreg->num_fuse_corners; i++) {

		cpr_vreg->fuse_quot_offset[i] = cpr_read_efuse_param(cpr_vreg,

					fuse_sel[0], fuse_sel[1], fuse_sel[2],

					fuse_sel[3]);

		cpr_vreg->fuse_quot_offset[i] *= quot_scale[i].multiplier;

		fuse_sel += 4;

	}

	rc = cpr_adjust_target_quot_offsets(pdev, cpr_vreg);

	kfree(tmp);

	return rc;

}

/*

 * Adjust the per-virtual-corner open loop voltage with an offset specfied by a

 * device-tree property. This must be called after open-loop voltage scaling.

		freq_max[i] /= 1000000;

	for (i = CPR_FUSE_CORNER_MIN + 1; i <= highest_fuse_corner; i++) {

		if (cpr_vreg->fuse_quot_offset)

			scaling[i] = 1000 * cpr_vreg->fuse_quot_offset[i]

				/ (freq_max[i] - freq_max[i - 1]);

		else

			scaling[i] = 1000 * (cpr_vreg->cpr_fuse_target_quot[i]

				      - cpr_vreg->cpr_fuse_target_quot[i - 1])

				  / (freq_max[i] - freq_max[i - 1]);

	return rc;

}

struct cpr_quot_scale {

	u32 offset;

	u32 multiplier;

};

/*

 * Check if the redundant set of CPR fuses should be used in place of the

 * primary set and configure the cpr_fuse_redundant element accordingly.

		}

	}

	/*

	 * Check whether the fuse-quot-offset is defined per fuse corner.

	 * If it is defined, use it (quot_offset) in the calculation

	 * below for obtaining scaling factor per fuse corner.

	 */

	rc = cpr_get_fuse_quot_offset(cpr_vreg, pdev, quot_scale);

	if (rc < 0)

		goto error;

	rc = cpr_get_corner_quot_adjustment(cpr_vreg, &pdev->dev);

	if (rc)

		goto error;

		cpr_vreg->cpr_fuse_disable = true;

		cpr_err(cpr_vreg,

			"cpr_fuse_bits == 0; permanently disabling CPR\n");

	} else {

	} else if (!cpr_vreg->fuse_quot_offset) {

		/*

		 * Check if the target quotients for the highest two fuse

		 * corners are too close together.