clk: at91: sama7g5: remove prescaler part of master clock

On SAMA7G5 the prescaler part of master clock has been implemented as a
changeable one. Everytime the prescaler is changed the PMC_SR.MCKRDY bit
must be polled. Value 1 for PMC_SR.MCKRDY means the prescaler update is
done. Driver polls for this bit until it becomes 1. On SAMA7G5 it has
been discovered that in some conditions the PMC_SR.MCKRDY is not rising
but the rate it provides it's stable. The workaround is to add a timeout
when polling for PMC_SR.MCKRDY. At the moment, for SAMA7G5, the prescaler
will be removed from Linux clock tree as all the frequencies for CPU could
be obtained from PLL and also there will be less overhead when changing
frequency via DVFS.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-14-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/at91/sama7g5.c b/drivers/clk/at91/sama7g5.c
index c66bde6f7b472b25ebf9ab4d72c24cf1bc6f081a..fd9d17eabf549fc2f18dd9e12db08a1d7ed53b9e 100644 (file)
--- a/drivers/clk/at91/sama7g5.c
+++ b/drivers/clk/at91/sama7g5.c
@@ -992,16 +992,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np)
        }
 
        parent_names[0] = "cpupll_divpmcck";
-       hw = at91_clk_register_master_pres(regmap, "cpuck", 1, parent_names,
-                                          &mck0_layout, &mck0_characteristics,
-                                          &pmc_mck0_lock,
-                                          CLK_SET_RATE_PARENT, 0);
-       if (IS_ERR(hw))
-               goto err_free;
-
-       sama7g5_pmc->chws[PMC_CPU] = hw;
-
-       hw = at91_clk_register_master_div(regmap, "mck0", "cpuck",
+       hw = at91_clk_register_master_div(regmap, "mck0", "cpupll_divpmcck",
                                          &mck0_layout, &mck0_characteristics,
                                          &pmc_mck0_lock, CLK_GET_RATE_NOCACHE, 5);
        if (IS_ERR(hw))