diff options
| author | Claudiu Beznea <claudiu.beznea@microchip.com> | 2022-12-08 13:45:13 +0200 |
|---|---|---|
| committer | Claudiu Beznea <claudiu.beznea@microchip.com> | 2023-01-09 14:05:41 +0200 |
| commit | 68b3b6f1773d2d1f8f58da7149e739213a3ed038 (patch) | |
| tree | 03df1c536a3a18a366800ba22cba6e6480482d5b /drivers/clk/at91/dt-compat.c | |
| parent | 1b929c02afd37871d5afb9d498426f83432e71c2 (diff) | |
| download | lwn-68b3b6f1773d2d1f8f58da7149e739213a3ed038.tar.gz lwn-68b3b6f1773d2d1f8f58da7149e739213a3ed038.zip | |
clk: at91: mark ddr clocks as critical
Mark DDR clocks as critical for AT91 devices. These clocks are enabled
by bootloader when initializing DDR and needs to stay enabled. Up to
this patch the DDR clocks were requested from drivers/memory/atmel-sdramc.c
which does only clock request and enable. There is no need to have
a separate driver just for this, thus the atmel-sdramc.c will be deleted
in a subsequent patch.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221208114515.35179-2-claudiu.beznea@microchip.com
Diffstat (limited to 'drivers/clk/at91/dt-compat.c')
| -rw-r--r-- | drivers/clk/at91/dt-compat.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/clk/at91/dt-compat.c b/drivers/clk/at91/dt-compat.c index 85a964cb2d89..97f67e23ef80 100644 --- a/drivers/clk/at91/dt-compat.c +++ b/drivers/clk/at91/dt-compat.c @@ -493,18 +493,28 @@ of_at91_clk_periph_setup(struct device_node *np, u8 type) parent_name, id); } else { struct clk_range range = CLK_RANGE(0, 0); + unsigned long flags = 0; of_at91_get_clk_range(periphclknp, "atmel,clk-output-range", &range); + /* + * mpddr_clk feed DDR controller and is enabled by + * bootloader thus we need to keep it enabled in case + * there is no Linux consumer for it. + */ + if (!strcmp(periphclknp->name, "mpddr_clk")) + flags = CLK_IS_CRITICAL; + hw = at91_clk_register_sam9x5_peripheral(regmap, &pmc_pcr_lock, &dt_pcr_layout, name, parent_name, id, &range, - INT_MIN); + INT_MIN, + flags); } if (IS_ERR(hw)) @@ -879,6 +889,8 @@ static void __init of_at91rm9200_clk_sys_setup(struct device_node *np) return; for_each_child_of_node(np, sysclknp) { + unsigned long flags = 0; + if (of_property_read_u32(sysclknp, "reg", &id)) continue; @@ -887,7 +899,16 @@ static void __init of_at91rm9200_clk_sys_setup(struct device_node *np) parent_name = of_clk_get_parent_name(sysclknp, 0); - hw = at91_clk_register_system(regmap, name, parent_name, id); + /* + * ddrck feeds DDR controller and is enabled by bootloader thus + * we need to keep it enabled in case there is no Linux consumer + * for it. + */ + if (!strcmp(sysclknp->name, "ddrck")) + flags = CLK_IS_CRITICAL; + + hw = at91_clk_register_system(regmap, name, parent_name, id, + flags); if (IS_ERR(hw)) continue; |