[PATCH v4 06/14] ARM: at91: sam9263_ll: drop PLL charge pump initialization

[Ahmad Fatoum]

The datasheet[1] described the PLL Charge Pump Current Register in 27.9.17
very sparingly by mandating that 0x10001 is to be written into it.

In the 28-Jan-16 revision of the datasheet the access mode for the
register was changed from Write-only to Read/Write. Indeed reading the
register is possible, but it seems to always return 0, even directly
after write.

Given that code for initializing the PLL charge pumps was added to
AT91Bootsrap only for SAMA5 support and that apparently no adverse effect
was observed on SAM9263 for not doing this for all these years, it follows
that the PLL charge pump has to be already initialized on POR or by BootROM
and we are better off playing it safe and not introducing code in the PMC
setup that didn't exist in Atmel's own AT91Bootstrap.

Therefore drop that line again. There are no upstream boards calling
this function yet anyway, so this should have very limited effect.

[1]: Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16

Reviewed-by: Sam Ravnborg <sam at ravnborg.org>
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 arch/arm/mach-at91/sam9263_ll.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/arm/mach-at91/sam9263_ll.c b/arch/arm/mach-at91/sam9263_ll.c
index 8855a679fdf2..7600391629af 100644
--- a/arch/arm/mach-at91/sam9263_ll.c
+++ b/arch/arm/mach-at91/sam9263_ll.c
@@ -11,9 +11,6 @@ static void sam9263_pmc_init(const struct sam92_pmc_config *config)
 {
 	at91_pmc_init(IOMEM(AT91SAM926X_BASE_PMC), 0);
 
-	/* Initialize PLL charge pump, must be done before PLLAR/PLLBR */
-	at91_pmc_init_pll(IOMEM(AT91SAM926X_BASE_PMC), AT91SAM9_PMC_ICPPLLA | AT91SAM9_PMC_ICPPLLB);
-
 	/* Setting PLL A and divider A */
 	at91_pmc_cfg_plla(IOMEM(AT91SAM926X_BASE_PMC),
 			  AT91_PMC_MUL_(config->mula) |
-- 
2.39.2