linux-kernel - [PATCH v2 2/2] clk: rockchip: rk3288: Handle clock tree for rk3288w

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Date:   Wed,  1 Apr 2020 17:35:13 +0200
From:   Mylène Josserand 
        <mylene.josserand@...labora.com>
To:     heiko@...ech.de, linux-arm-kernel@...ts.infradead.org,
        mturquette@...libre.com, sboyd@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-clk@...r.kernel.org, mylene.josserand@...labora.com,
        kernel@...labora.com, kever.yang@...k-chips.com,
        geert@...ux-m68k.org
Subject: [PATCH v2 2/2] clk: rockchip: rk3288: Handle clock tree for rk3288w

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 SOC it is
and creating the div accordingly. Because we are using
soc_device_match function, we need to delay the registration
of this clock later than others to have time to get SoC revision.

Otherwise, because of CLK_OF_DECLARE uses, clock tree will be
created too soon to have time to detect SoC's revision.

Signed-off-by: Mylène Josserand <mylene.josserand@...labora.com>
---
 drivers/clk/rockchip/clk-rk3288.c | 36 +++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
index cc2a177bbdbf..1950d1efe1b8 100644
--- a/drivers/clk/rockchip/clk-rk3288.c
+++ b/drivers/clk/rockchip/clk-rk3288.c
@@ -9,6 +9,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/syscore_ops.h>
+#include <linux/sys_soc.h>
 #include <dt-bindings/clock/rk3288-cru.h>
 #include "clk.h"
 
@@ -425,8 +426,6 @@ 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 +818,16 @@ 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",
@@ -914,10 +923,15 @@ static struct syscore_ops rk3288_clk_syscore_ops = {
 	.resume = rk3288_clk_resume,
 };
 
+static const struct soc_device_attribute rk3288w[] = {
+	{ .soc_id = "RK32xx", .revision = "RK3288w" },
+	{ /* sentinel */ }
+};
+
+static struct rockchip_clk_provider *ctx;
+
 static void __init rk3288_clk_init(struct device_node *np)
 {
-	struct rockchip_clk_provider *ctx;
-
 	rk3288_cru_base = of_iomap(np, 0);
 	if (!rk3288_cru_base) {
 		pr_err("%s: could not map cru region\n", __func__);
@@ -955,3 +969,17 @@ static void __init rk3288_clk_init(struct device_node *np)
 	rockchip_clk_of_add_provider(np, ctx);
 }
 CLK_OF_DECLARE(rk3288_cru, "rockchip,rk3288-cru", rk3288_clk_init);
+
+static int __init rk3288_hclkvio_register(void)
+{
+	/* Check for the rk3288w revision as clock tree is different */
+	if (soc_device_match(rk3288w))
+		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));
+
+	return 0;
+}
+subsys_initcall(rk3288_hclkvio_register);
-- 
2.25.1