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

From: MylÃne Josserand
Date: Wed Apr 01 2020 - 11:35:52 EST


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: MylÃne Josserand <mylene.josserand@xxxxxxxxxxxxx>
---
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