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Commit 4cff6d99 authored by Sahitya Tummala's avatar Sahitya Tummala Committed by Christoph Hellwig
Browse files

ufs: Add freq-table-hz property for UFS device 



Add freq-table-hz propery for UFS device to keep track of
<min max> frequencies supported by UFS clocks.

Signed-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
Signed-off-by: default avatarDolev Raviv <draviv@codeaurora.org>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 1ab27c9c

Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt

+6 −6
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ Optional properties: 
- clocks                : List of phandle and clock specifier pairs

- clock-names           : List of clock input name strings sorted in the same

                          order as the clocks property.

- max-clock-frequency-hz : List of maximum operating frequency stored in the same

- freq-table-hz		: Array of <min max> operating frequencies stored in the same

                          order as the clocks property. If this property is not

			  defined or a value in the array is "0" then it is assumed

			  that the frequency is set by the parent clock or a
@@ -53,5 +53,5 @@ Example: 


		clocks = <&core 0>, <&ref 0>, <&iface 0>;

		clock-names = "core_clk", "ref_clk", "iface_clk";

		max-clock-frequency-hz = <100000000 19200000 0>;

		freq-table-hz = <100000000 200000000>, <0 0>, <0 0>;

	};

drivers/scsi/ufs/ufshcd-pltfrm.c

+35 −13
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba) 
	char *name;

	u32 *clkfreq = NULL;

	struct ufs_clk_info *clki;

	int len = 0;

	size_t sz = 0;



	if (!np)

		goto out;
@@ -82,39 +84,59 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba) 
	if (cnt <= 0)

		goto out;



	clkfreq = kzalloc(cnt * sizeof(*clkfreq), GFP_KERNEL);

	if (!of_get_property(np, "freq-table-hz", &len)) {

		dev_info(dev, "freq-table-hz property not specified\n");

		goto out;

	}



	if (len <= 0)

		goto out;



	sz = len / sizeof(*clkfreq);

	if (sz != 2 * cnt) {

		dev_err(dev, "%s len mismatch\n", "freq-table-hz");

		ret = -EINVAL;

		goto out;

	}



	clkfreq = devm_kzalloc(dev, sz * sizeof(*clkfreq),

			GFP_KERNEL);

	if (!clkfreq) {

		dev_err(dev, "%s: no memory\n", "freq-table-hz");

		ret = -ENOMEM;

		dev_err(dev, "%s: memory alloc failed\n", __func__);

		goto out;

	}



	ret = of_property_read_u32_array(np,

			"max-clock-frequency-hz", clkfreq, cnt);

	ret = of_property_read_u32_array(np, "freq-table-hz",

			clkfreq, sz);

	if (ret && (ret != -EINVAL)) {

		dev_err(dev, "%s: invalid max-clock-frequency-hz property, %d\n",

				__func__, ret);

		goto out;

		dev_err(dev, "%s: error reading array %d\n",

				"freq-table-hz", ret);

		goto free_clkfreq;

	}



	for (i = 0; i < cnt; i++) {

	for (i = 0; i < sz; i += 2) {

		ret = of_property_read_string_index(np,

				"clock-names", i, (const char **)&name);

				"clock-names", i/2, (const char **)&name);

		if (ret)

			goto out;

			goto free_clkfreq;



		clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);

		if (!clki) {

			ret = -ENOMEM;

			goto out;

			goto free_clkfreq;

		}



		clki->max_freq = clkfreq[i];

		clki->min_freq = clkfreq[i];

		clki->max_freq = clkfreq[i+1];

		clki->name = kstrdup(name, GFP_KERNEL);

		dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",

				clki->min_freq, clki->max_freq, clki->name);

		list_add_tail(&clki->list, &hba->clk_list_head);

	}

out:

free_clkfreq:

	kfree(clkfreq);

out:

	return ret;

}

drivers/scsi/ufs/ufshcd.h

+2 −0
Original line number Diff line number Diff line
@@ -209,6 +209,7 @@ struct ufs_dev_cmd { 
 * @clk: clock node

 * @name: clock name

 * @max_freq: maximum frequency supported by the clock

 * @min_freq: min frequency that can be used for clock scaling

 * @enabled: variable to check against multiple enable/disable

 */

struct ufs_clk_info {
@@ -216,6 +217,7 @@ struct ufs_clk_info { 
	struct clk *clk;

	const char *name;

	u32 max_freq;

	u32 min_freq;

	bool enabled;

};