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: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Dolev Raviv <draviv@codeaurora.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
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@ -26,11 +26,11 @@ Optional properties:
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- clocks : List of phandle and clock specifier pairs
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- clocks : List of phandle and clock specifier pairs
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- clock-names : List of clock input name strings sorted in the same
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- clock-names : List of clock input name strings sorted in the same
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order as the clocks property.
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order as the clocks property.
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- max-clock-frequency-hz : List of maximum operating frequency stored in the same
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- freq-table-hz : Array of <min max> operating frequencies stored in the same
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order as the clocks property. If this property is not
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order as the clocks property. If this property is not
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defined or a value in the array is "0" then it is assumed
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defined or a value in the array is "0" then it is assumed
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that the frequency is set by the parent clock or a
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that the frequency is set by the parent clock or a
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fixed rate clock source.
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fixed rate clock source.
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Note: If above properties are not defined it can be assumed that the supply
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Note: If above properties are not defined it can be assumed that the supply
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regulators or clocks are always on.
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regulators or clocks are always on.
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@ -53,5 +53,5 @@ Example:
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clocks = <&core 0>, <&ref 0>, <&iface 0>;
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clocks = <&core 0>, <&ref 0>, <&iface 0>;
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clock-names = "core_clk", "ref_clk", "iface_clk";
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clock-names = "core_clk", "ref_clk", "iface_clk";
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max-clock-frequency-hz = <100000000 19200000 0>;
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freq-table-hz = <100000000 200000000>, <0 0>, <0 0>;
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};
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};
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@ -63,6 +63,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
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char *name;
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char *name;
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u32 *clkfreq = NULL;
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u32 *clkfreq = NULL;
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struct ufs_clk_info *clki;
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struct ufs_clk_info *clki;
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int len = 0;
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size_t sz = 0;
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if (!np)
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if (!np)
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goto out;
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goto out;
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@ -82,39 +84,59 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
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if (cnt <= 0)
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if (cnt <= 0)
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goto out;
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goto out;
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clkfreq = kzalloc(cnt * sizeof(*clkfreq), GFP_KERNEL);
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if (!of_get_property(np, "freq-table-hz", &len)) {
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dev_info(dev, "freq-table-hz property not specified\n");
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goto out;
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}
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if (len <= 0)
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goto out;
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sz = len / sizeof(*clkfreq);
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if (sz != 2 * cnt) {
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dev_err(dev, "%s len mismatch\n", "freq-table-hz");
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ret = -EINVAL;
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goto out;
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}
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clkfreq = devm_kzalloc(dev, sz * sizeof(*clkfreq),
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GFP_KERNEL);
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if (!clkfreq) {
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if (!clkfreq) {
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dev_err(dev, "%s: no memory\n", "freq-table-hz");
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ret = -ENOMEM;
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ret = -ENOMEM;
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dev_err(dev, "%s: memory alloc failed\n", __func__);
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goto out;
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goto out;
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}
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}
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ret = of_property_read_u32_array(np,
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ret = of_property_read_u32_array(np, "freq-table-hz",
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"max-clock-frequency-hz", clkfreq, cnt);
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clkfreq, sz);
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if (ret && (ret != -EINVAL)) {
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if (ret && (ret != -EINVAL)) {
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dev_err(dev, "%s: invalid max-clock-frequency-hz property, %d\n",
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dev_err(dev, "%s: error reading array %d\n",
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__func__, ret);
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"freq-table-hz", ret);
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goto out;
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goto free_clkfreq;
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}
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}
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for (i = 0; i < cnt; i++) {
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for (i = 0; i < sz; i += 2) {
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ret = of_property_read_string_index(np,
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ret = of_property_read_string_index(np,
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"clock-names", i, (const char **)&name);
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"clock-names", i/2, (const char **)&name);
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if (ret)
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if (ret)
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goto out;
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goto free_clkfreq;
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clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
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clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
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if (!clki) {
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if (!clki) {
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ret = -ENOMEM;
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ret = -ENOMEM;
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goto out;
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goto free_clkfreq;
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}
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}
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clki->max_freq = clkfreq[i];
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clki->min_freq = clkfreq[i];
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clki->max_freq = clkfreq[i+1];
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clki->name = kstrdup(name, GFP_KERNEL);
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clki->name = kstrdup(name, GFP_KERNEL);
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dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
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clki->min_freq, clki->max_freq, clki->name);
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list_add_tail(&clki->list, &hba->clk_list_head);
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list_add_tail(&clki->list, &hba->clk_list_head);
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}
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}
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out:
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free_clkfreq:
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kfree(clkfreq);
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kfree(clkfreq);
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out:
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return ret;
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return ret;
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}
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}
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@ -209,6 +209,7 @@ struct ufs_dev_cmd {
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* @clk: clock node
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* @clk: clock node
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* @name: clock name
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* @name: clock name
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* @max_freq: maximum frequency supported by the clock
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* @max_freq: maximum frequency supported by the clock
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* @min_freq: min frequency that can be used for clock scaling
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* @enabled: variable to check against multiple enable/disable
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* @enabled: variable to check against multiple enable/disable
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*/
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*/
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struct ufs_clk_info {
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struct ufs_clk_info {
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@ -216,6 +217,7 @@ struct ufs_clk_info {
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struct clk *clk;
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struct clk *clk;
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const char *name;
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const char *name;
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u32 max_freq;
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u32 max_freq;
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u32 min_freq;
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bool enabled;
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bool enabled;
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};
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};
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