Quoting Aapo Vienamo (2018-07-04 03:17:33)
> diff --git a/drivers/clk/tegra/div71.c b/drivers/clk/tegra/div71.c
> new file mode 100644
> index 0000000..1a5e04c
> --- /dev/null
> +++ b/drivers/clk/tegra/div71.c
> @@ -0,0 +1,54 @@
> +/*
> + * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/kernel.h>
You can include <asm/div64.h> instead.
> +
> +#include "clk.h"
> +
> +#define div_mask(w) ((1 << (w)) - 1)
> +
> +int div71_get(unsigned long rate, unsigned parent_rate, u8 width,
> + u8 frac_width, u8 flags)
> +{
> + u64 divider_ux1 = parent_rate;
Hmm ok, now it's unsigned. That's works too.
> + int mul;
> +
> + if (!rate)
> + return 0;
> +
> + mul = 1 << frac_width;
> +
> + if (!(flags & TEGRA_DIVIDER_INT))
> + divider_ux1 *= mul;
> +
> + if (flags & TEGRA_DIVIDER_ROUND_UP)
> + divider_ux1 += rate - 1;
> +
> + do_div(divider_ux1, rate);
> +
> + if (flags & TEGRA_DIVIDER_INT)
> + divider_ux1 *= mul;
> +
> + if (divider_ux1 < mul)
> + return 0;
> +
> + divider_ux1 -= mul;
> +
> + if (divider_ux1 > div_mask(width))
> + return div_mask(width);
> +
> + return divider_ux1;
> +}
