[U-Boot] [PATCH v3 01/26] sun6i: Restrict some register initialization to Allwinner A31 SoC

Andre Przywara andre.przywara at arm.com
Mon Dec 19 02:49:51 CET 2016

These days many Allwinner SoCs use clock_sun6i.c, although out of them
only the (original sun6i) A31 has a second MBUS clock register.
Also the requirement for setting up the PRCM PLL_CTLR1 register to provide
the proper voltage seems to be a property of older SoCs only as well.

Restrict the MBUS initialization to this SoC only to avoid writing bogus
values to (undefined) registers in other chips.
I can only verify that the PLL voltage setup is not needed for H3 and
A64, so for now we only spare those two SoCs.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
Reviewed-by: Alexander Graf <agraf at suse.de>
Reviewed-by: Chen-Yu Tsai <wens at csie.org>
Reviewed-by: Simon Glass <sjg at chromium.org>
Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>
 arch/arm/mach-sunxi/clock_sun6i.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/clock_sun6i.c b/arch/arm/mach-sunxi/clock_sun6i.c
index ed8cd9b..80cfc0b 100644
--- a/arch/arm/mach-sunxi/clock_sun6i.c
+++ b/arch/arm/mach-sunxi/clock_sun6i.c
@@ -21,6 +21,8 @@ void clock_init_safe(void)
 	struct sunxi_ccm_reg * const ccm =
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+#if !defined(CONFIG_MACH_SUN8I_H3) && !defined(CONFIG_MACH_SUN50I)
 	struct sunxi_prcm_reg * const prcm =
 		(struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
@@ -31,6 +33,7 @@ void clock_init_safe(void)
 	clrbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK);
@@ -41,7 +44,8 @@ void clock_init_safe(void)
 	writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
 	writel(MBUS_CLK_DEFAULT, &ccm->mbus0_clk_cfg);
-	writel(MBUS_CLK_DEFAULT, &ccm->mbus1_clk_cfg);
+		writel(MBUS_CLK_DEFAULT, &ccm->mbus1_clk_cfg);

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