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Commit 7ed25593 authored by Sayali Lokhande's avatar Sayali Lokhande
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scsi: ufs: Get UFS ref_clk min/max voltage from device tree 



This change allows selecting the UFS ref clk voltage level
by setting ref-clk-min-uV and ref-clk-max-uV in device tree.
If ref_clk voltage level setting is not found in device tree,
use default values provided by driver.

Change-Id: Ia3c0c61a508045448057cc3057a30546a458bfc9
Signed-off-by: default avatarSayali Lokhande <sayalil@codeaurora.org>
parent 829ed9cc

Documentation/devicetree/bindings/ufs/ufs-qcom.txt

+2 −0
Original line number Original line Diff line number Diff line
@@ -36,6 +36,8 @@ Optional properties: 
- vdda-pll-max-microamp : specifies max. load that can be drawn from pll supply

- vdda-pll-max-microamp : specifies max. load that can be drawn from pll supply

- vddp-ref-clk-supply   : phandle to UFS device ref_clk pad power supply

- vddp-ref-clk-supply   : phandle to UFS device ref_clk pad power supply

- vddp-ref-clk-max-microamp : specifies max. load that can be drawn from this supply

- vddp-ref-clk-max-microamp : specifies max. load that can be drawn from this supply

- vddp-ref-clk-min-uV : specifies min voltage that can be set for reference clock supply

- vddp-ref-clk-max-uV : specifies max voltage that can be set for reference clock supply

- qcom,disable-lpm : disable various LPM mechanisms in UFS for platform compatibility

- qcom,disable-lpm : disable various LPM mechanisms in UFS for platform compatibility

  (limit link to PWM Gear-1, 1-lane slow mode; disable hibernate, and avoid suspend/resume)

  (limit link to PWM Gear-1, 1-lane slow mode; disable hibernate, and avoid suspend/resume)

drivers/scsi/ufs/ufs-qcom.c

+17 −3
Original line number Original line Diff line number Diff line 
/*

/*

 * Copyright (c) 2013-2017, Linux Foundation. All rights reserved.

 * Copyright (c) 2013-2018, Linux Foundation. All rights reserved.

 *

 *

 * This program is free software; you can redistribute it and/or modify

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * it under the terms of the GNU General Public License version 2 and
@@ -2086,8 +2086,22 @@ static int ufs_qcom_parse_reg_info(struct ufs_qcom_host *host, char *name, 
		dev_err(dev, "%s: %s get failed, err=%d\n",

		dev_err(dev, "%s: %s get failed, err=%d\n",

			__func__, vreg->name, ret);

			__func__, vreg->name, ret);

	}

	}



	snprintf(prop_name, MAX_PROP_SIZE, "%s-min-uV", name);

	ret = of_property_read_u32(np, prop_name, &vreg->min_uV);

	if (ret) {

		dev_dbg(dev, "%s: unable to find %s err %d, using default\n",

			__func__, prop_name, ret);

		vreg->min_uV = VDDP_REF_CLK_MIN_UV;

		vreg->min_uV = VDDP_REF_CLK_MIN_UV;

	}



	snprintf(prop_name, MAX_PROP_SIZE, "%s-max-uV", name);

	ret = of_property_read_u32(np, prop_name, &vreg->max_uV);

	if (ret) {

		dev_dbg(dev, "%s: unable to find %s err %d, using default\n",

			__func__, prop_name, ret);

		vreg->max_uV = VDDP_REF_CLK_MAX_UV;

		vreg->max_uV = VDDP_REF_CLK_MAX_UV;

	}





out:

out:

	if (!ret)

	if (!ret)