[PATCH v2] timer: starfive: Add Starfive timer support

[Jun Liang Tan]

From: Kuan Lim Lee <kuanlim....@starfivetech.com>

Add timer driver in Starfive SoC. It is an timer that outside
of CPU core and inside Starfive SoC.

Signed-off-by: Kuan Lim Lee <kuanlim....@starfivetech.com>
Signed-off-by: Wei Liang Lim <weiliang....@starfivetech.com>

Changes for v2:
- correct driver name, comment, variable
---
 drivers/timer/starfive-timer.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/timer/starfive-timer.c b/drivers/timer/starfive-timer.c
index 816402fdbf..6ac7d7f1d0 100644
--- a/drivers/timer/starfive-timer.c
+++ b/drivers/timer/starfive-timer.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2022 StarFive, Inc. All rights reserved.
- *   Author: Lee Kuan Lim <kuanlim....@starfivetech.com>
+ *   Author: Kuan Lim Lee <kuanlim....@starfivetech.com>
  */
 
 #include <common.h>
@@ -48,8 +48,8 @@ static int starfive_probe(struct udevice *dev)
        int ret;
 
        priv->base = dev_read_addr_ptr(dev);
-       if (IS_ERR(priv->base))
-               return PTR_ERR(priv->base);
+       if (!priv->base)
+               return -EINVAL;
 
        timer_channel = dev_read_u32_default(dev, "channel", 0);
        priv->base = priv->base + (0x40 * timer_channel);
@@ -64,14 +64,16 @@ static int starfive_probe(struct udevice *dev)
                return ret;
        uc_priv->clock_rate = clk_get_rate(&clk);
 
-       /* Initiate timer, channel 0 */
-       /* Unmask Interrupt Mask */
+       /*
+        * Initiate timer, channel 0
+        * Unmask Interrupt Mask
+        */
        writel(0, priv->base + STF_TIMER_INT_MASK);
        /* Single run mode Setting */
        if (dev_read_bool(dev, "single-run"))
                writel(1, priv->base + STF_TIMER_CTL);
        /* Set Reload value */
-       priv->timer_size = dev_read_u32_default(dev, "timer-size", 0xffffffff);
+       priv->timer_size = dev_read_u32_default(dev, "timer-size", -1U);
        writel(priv->timer_size, priv->base + STF_TIMER_LOAD);
        /* Enable to start timer */
        writel(1, priv->base + STF_TIMER_ENABLE);
@@ -85,7 +87,7 @@ static const struct udevice_id starfive_ids[] = {
 };
 
 U_BOOT_DRIVER(jh8100_starfive_timer) = {
-       .name           = "jh8100_starfive_timer",
+       .name           = "starfive_timer",
        .id             = UCLASS_TIMER,
        .of_match       = starfive_ids,
        .probe          = starfive_probe,
-- 
2.25.1