add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/drivers/clk/sunxi-ng/ccu_nkmp.c
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@@ -1,14 +1,11 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright (C) 2016 Maxime Ripard
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  * Maxime Ripard <maxime.ripard@free-electrons.com>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation; either version 2 of
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- * the License, or (at your option) any later version.
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  */
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 #include <linux/clk-provider.h>
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+#include <linux/io.h>
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 #include "ccu_gate.h"
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 #include "ccu_nkmp.h"
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@@ -137,6 +134,13 @@
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 	if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
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 		rate *= nkmp->fixed_post_div;
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+	if (nkmp->max_rate && rate > nkmp->max_rate) {
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+		rate = nkmp->max_rate;
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+		if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
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+			rate /= nkmp->fixed_post_div;
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+		return rate;
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+	}
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+
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 	_nkmp.min_n = nkmp->n.min ?: 1;
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 	_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
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 	_nkmp.min_k = nkmp->k.min ?: 1;
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@@ -179,6 +183,12 @@
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 	ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
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+	/*
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+	 * If width is 0, GENMASK() macro may not generate expected mask (0)
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+	 * as it falls under undefined behaviour by C standard due to shifts
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+	 * which are equal or greater than width of left operand. This can
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+	 * be easily avoided by explicitly checking if width is 0.
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+	 */
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 	if (nkmp->n.width)
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 		n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1,
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 				 nkmp->n.shift);