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clk: ingenic: Support overriding PLLs M/N/OD calc algorithm

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SoC-specific code can now provide a callback if they need to compute the
M/N/OD values in a specific way.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: 周琰杰 (Zhou Yanjie)<zhouyanjie@wanyeetech.com>   # on CU1000-neo/X1000E
Link: https://lore.kernel.org/r/20210530164923.18134-6-paul@crapouillou.net
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Paul Cercueil 2021-05-30 17:49:22 +01:00 committed by Stephen Boyd
parent 037f1ffd0f
commit b60b0b5592
2 changed files with 30 additions and 13 deletions
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40
drivers/clk/ingenic/cgu.c
View file

@ -119,28 +119,42 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
n * od);
}
static unsigned long
ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
unsigned long rate, unsigned long parent_rate,
unsigned *pm, unsigned *pn, unsigned *pod)
static void
ingenic_pll_calc_m_n_od(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *pm, unsigned int *pn, unsigned int *pod)
{
const struct ingenic_cgu_pll_info *pll_info;
unsigned m, n, od;
pll_info = &clk_info->pll;
od = 1;
unsigned int m, n, od = 1;
/*
* The frequency after the input divider must be between 10 and 50 MHz.
* The highest divider yields the best resolution.
*/
n = parent_rate / (10 * MHZ);
n = min_t(unsigned, n, 1 << clk_info->pll.n_bits);
n = max_t(unsigned, n, pll_info->n_offset);
n = min_t(unsigned int, n, 1 << pll_info->n_bits);
n = max_t(unsigned int, n, pll_info->n_offset);
m = (rate / MHZ) * od * n / (parent_rate / MHZ);
m = min_t(unsigned, m, 1 << clk_info->pll.m_bits);
m = max_t(unsigned, m, pll_info->m_offset);
m = min_t(unsigned int, m, 1 << pll_info->m_bits);
m = max_t(unsigned int, m, pll_info->m_offset);
*pm = m;
*pn = n;
*pod = od;
}
static unsigned long
ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *pm, unsigned int *pn, unsigned int *pod)
{
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
unsigned int m, n, od;
if (pll_info->calc_m_n_od)
(*pll_info->calc_m_n_od)(pll_info, rate, parent_rate, &m, &n, &od);
else
ingenic_pll_calc_m_n_od(pll_info, rate, parent_rate, &m, &n, &od);
if (pm)
*pm = m;

3
drivers/clk/ingenic/cgu.h
View file

@ -55,6 +55,9 @@ struct ingenic_cgu_pll_info {
s8 bypass_bit;
u8 enable_bit;
u8 stable_bit;
void (*calc_m_n_od)(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *m, unsigned int *n, unsigned int *od);
};
/**