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clk: sunxi-ng: common: Support minimum and maximum rate
The Allwinner SoC's typically have an upper and lower limit for their clocks' rates. Up until now, support for that has been implemented separately for each clock type. Implement that functionality in the sunxi-ng's common part making use of the CCF rate liming capabilities, so that it is available for all clock types. Suggested-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev> Cc: stable@vger.kernel.org Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Acked-by: Maxime Ripard <mripard@kernel.org> Link: https://lore.kernel.org/r/20240310-pinephone-pll-fixes-v4-1-46fc80c83637@oltmanns.dev Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
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2 changed files with 22 additions and 0 deletions
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@ -44,6 +44,16 @@ bool ccu_is_better_rate(struct ccu_common *common,
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unsigned long current_rate,
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unsigned long best_rate)
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{
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unsigned long min_rate, max_rate;
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clk_hw_get_rate_range(&common->hw, &min_rate, &max_rate);
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if (current_rate > max_rate)
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return false;
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if (current_rate < min_rate)
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return false;
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if (common->features & CCU_FEATURE_CLOSEST_RATE)
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return abs(current_rate - target_rate) < abs(best_rate - target_rate);
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@ -122,6 +132,7 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
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for (i = 0; i < desc->hw_clks->num ; i++) {
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struct clk_hw *hw = desc->hw_clks->hws[i];
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struct ccu_common *common = hw_to_ccu_common(hw);
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const char *name;
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if (!hw)
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@ -136,6 +147,14 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
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pr_err("Couldn't register clock %d - %s\n", i, name);
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goto err_clk_unreg;
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}
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if (common->max_rate)
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clk_hw_set_rate_range(hw, common->min_rate,
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common->max_rate);
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else
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WARN(common->min_rate,
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"No max_rate, ignoring min_rate of clock %d - %s\n",
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i, name);
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}
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ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
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@ -31,6 +31,9 @@ struct ccu_common {
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u16 lock_reg;
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u32 prediv;
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unsigned long min_rate;
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unsigned long max_rate;
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unsigned long features;
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spinlock_t *lock;
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struct clk_hw hw;
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