sun6i: Restrict some register initialization to Allwinner A31 SoC

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@arm.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

diff --git a/arch/arm/mach-sunxi/clock_sun6i.c b/arch/arm/mach-sunxi/clock_sun6i.c
index ed8cd9b..80cfc0b 100644 (file)
--- 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)
                PRCM_PLL_CTRL_LDO_DIGITAL_EN | PRCM_PLL_CTRL_LDO_ANALOG_EN |
                PRCM_PLL_CTRL_EXT_OSC_EN | PRCM_PLL_CTRL_LDO_OUT_L(1140));
        clrbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK);
+#endif
 
        clock_set_pll1(408000000);
 
@@ -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);
+       if (IS_ENABLED(CONFIG_MACH_SUN6I))
+               writel(MBUS_CLK_DEFAULT, &ccm->mbus1_clk_cfg);
 }
 #endif