clk: rockchip: Handle clock tree for rk3288w variant

The revision rk3288w has a different clock tree about "hclk_vio"
clock, according to the BSP kernel code.

This patch handles this difference by detecting which device-tree
we are using. If it is a "rockchip,rk3288-cru", let's register
the clock tree as it was before. If the device-tree node is
"rockchip,rk3288w-cru", we will apply the difference with this
version of this SoC.

Noticed that this new device-tree compatible must be handled in
bootloader such as u-boot.

Signed-off-by: Mylène Josserand <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: Mylène Josserand

drivers/clk/rockchip/clk-rk3288.c

@@ -425,8 +425,6 @@ static struct rockchip_clk_branch rk3288_clk_branches[] __initdata = {
 	COMPOSITE(0, "aclk_vio0", mux_pll_src_cpll_gpll_usb480m_p, CLK_IGNORE_UNUSED,
 			RK3288_CLKSEL_CON(31), 6, 2, MFLAGS, 0, 5, DFLAGS,
 			RK3288_CLKGATE_CON(3), 0, GFLAGS),
-	DIV(0, "hclk_vio", "aclk_vio0", 0,
-			RK3288_CLKSEL_CON(28), 8, 5, DFLAGS),
 	COMPOSITE(0, "aclk_vio1", mux_pll_src_cpll_gpll_usb480m_p, CLK_IGNORE_UNUSED,
 			RK3288_CLKSEL_CON(31), 14, 2, MFLAGS, 8, 5, DFLAGS,
 			RK3288_CLKGATE_CON(3), 2, GFLAGS),
@@ -819,6 +817,16 @@ static struct rockchip_clk_branch rk3288_clk_branches[] __initdata = {
 	INVERTER(0, "pclk_isp", "pclk_isp_in", RK3288_CLKSEL_CON(29), 3, IFLAGS),
 };
 
+static struct rockchip_clk_branch rk3288w_hclkvio_branch[] __initdata = {
+	DIV(0, "hclk_vio", "aclk_vio1", 0,
+			RK3288_CLKSEL_CON(28), 8, 5, DFLAGS),
+};
+
+static struct rockchip_clk_branch rk3288_hclkvio_branch[] __initdata = {
+	DIV(0, "hclk_vio", "aclk_vio0", 0,
+			RK3288_CLKSEL_CON(28), 8, 5, DFLAGS),
+};
+
 static const char *const rk3288_critical_clocks[] __initconst = {
 	"aclk_cpu",
 	"aclk_peri",
@@ -936,6 +944,14 @@ static void __init rk3288_clk_init(struct device_node *np)
 				   RK3288_GRF_SOC_STATUS1);
 	rockchip_clk_register_branches(ctx, rk3288_clk_branches,
 				  ARRAY_SIZE(rk3288_clk_branches));
+
+	if (of_device_is_compatible(np, "rockchip,rk3288w-cru"))
+		rockchip_clk_register_branches(ctx, rk3288w_hclkvio_branch,
+					       ARRAY_SIZE(rk3288w_hclkvio_branch));
+	else
+		rockchip_clk_register_branches(ctx, rk3288_hclkvio_branch,
+					       ARRAY_SIZE(rk3288_hclkvio_branch));
+
 	rockchip_clk_protect_critical(rk3288_critical_clocks,
 				      ARRAY_SIZE(rk3288_critical_clocks));