clocksource/drivers/rockchip_timer: Convert init function to return error

The init functions do not return any error. They behave as the following:

 - panic, thus leading to a kernel crash while another timer may work and
   make the system boot up correctly

 or

 - print an error and let the caller unaware if the state of the system

Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.

Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>

on a rk3399-evb
Tested-by: Heiko Stuebner <heiko@sntech.de>

1 files changed, 21 insertions, 14 deletions

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index a3f22b03f94f..85aee6953944 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -113,38 +113,42 @@ static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-static void __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
+static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 {
         struct clock_event_device *ce = &bc_timer.ce;
         struct clk *timer_clk;
         struct clk *pclk;
-        int ret, irq;
+        int ret = -EINVAL, irq;
 
         bc_timer.base = of_iomap(np, 0);
         if (!bc_timer.base) {
                 pr_err("Failed to get base address for '%s'\n", TIMER_NAME);
-                return;
+                return -ENXIO;
         }
         bc_timer.ctrl = bc_timer.base + ctrl_reg;
 
         pclk = of_clk_get_by_name(np, "pclk");
         if (IS_ERR(pclk)) {
+                ret = PTR_ERR(pclk);
                 pr_err("Failed to get pclk for '%s'\n", TIMER_NAME);
                 goto out_unmap;
         }
 
-        if (clk_prepare_enable(pclk)) {
+        ret = clk_prepare_enable(pclk);
+        if (ret) {
                 pr_err("Failed to enable pclk for '%s'\n", TIMER_NAME);
                 goto out_unmap;
         }
 
         timer_clk = of_clk_get_by_name(np, "timer");
         if (IS_ERR(timer_clk)) {
+                ret = PTR_ERR(timer_clk);
                 pr_err("Failed to get timer clock for '%s'\n", TIMER_NAME);
                 goto out_timer_clk;
         }
 
-        if (clk_prepare_enable(timer_clk)) {
+        ret = clk_prepare_enable(timer_clk);
+        if (ret) {
                 pr_err("Failed to enable timer clock\n");
                 goto out_timer_clk;
         }
@@ -153,6 +157,7 @@ static void __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 
         irq = irq_of_parse_and_map(np, 0);
         if (!irq) {
+                ret = -EINVAL;
                 pr_err("Failed to map interrupts for '%s'\n", TIMER_NAME);
                 goto out_irq;
         }
@@ -178,7 +183,7 @@ static void __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 
         clockevents_config_and_register(ce, bc_timer.freq, 1, UINT_MAX);
 
-        return;
+        return 0;
 
 out_irq:
         clk_disable_unprepare(timer_clk);
@@ -186,19 +191,21 @@ out_timer_clk:
         clk_disable_unprepare(pclk);
 out_unmap:
         iounmap(bc_timer.base);
+
+        return ret;
 }
 
-static void __init rk3288_timer_init(struct device_node *np)
+static int __init rk3288_timer_init(struct device_node *np)
 {
-        rk_timer_init(np, TIMER_CONTROL_REG3288);
+        return rk_timer_init(np, TIMER_CONTROL_REG3288);
 }
 
-static void __init rk3399_timer_init(struct device_node *np)
+static int __init rk3399_timer_init(struct device_node *np)
 {
-        rk_timer_init(np, TIMER_CONTROL_REG3399);
+        return rk_timer_init(np, TIMER_CONTROL_REG3399);
 }
 
-CLOCKSOURCE_OF_DECLARE(rk3288_timer, "rockchip,rk3288-timer",
-                       rk3288_timer_init);
-CLOCKSOURCE_OF_DECLARE(rk3399_timer, "rockchip,rk3399-timer",
-                       rk3399_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(rk3288_timer, "rockchip,rk3288-timer",
+                           rk3288_timer_init);
+CLOCKSOURCE_OF_DECLARE_RET(rk3399_timer, "rockchip,rk3399-timer",
+                           rk3399_timer_init);