clocksource: sh_mtu2: Allocate channels dynamically

This prepares the driver for multi-channel support.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Wolfram Sang <wsa@sang-engineering.com>

1 files changed, 20 insertions, 7 deletions

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 94a53428a556..45e1e85fcbeb 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -52,7 +52,8 @@ struct sh_mtu2_device {
         void __iomem *mapbase;
         struct clk *clk;
 
-        struct sh_mtu2_channel channel;
+        struct sh_mtu2_channel *channels;
+        unsigned int num_channels;
 };
 
 static DEFINE_RAW_SPINLOCK(sh_mtu2_lock);
@@ -296,6 +297,7 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
 {
         struct sh_timer_config *cfg = pdev->dev.platform_data;
         struct resource *res;
+        void __iomem *base;
         int ret;
         ret = -ENXIO;
 
@@ -315,16 +317,16 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
         }
 
         /*
-         * Map memory, let channel.base point to our channel and mapbase to the
+         * Map memory, let base point to our channel and mapbase to the
          * start/stop shared register.
          */
-        mtu->channel.base = ioremap_nocache(res->start, resource_size(res));
-        if (mtu->channel.base == NULL) {
+        base = ioremap_nocache(res->start, resource_size(res));
+        if (base == NULL) {
                 dev_err(&mtu->pdev->dev, "failed to remap I/O memory\n");
                 goto err0;
         }
 
-        mtu->mapbase = mtu->channel.base + cfg->channel_offset;
+        mtu->mapbase = base + cfg->channel_offset;
 
         /* get hold of clock */
         mtu->clk = clk_get(&mtu->pdev->dev, "mtu2_fck");
@@ -338,17 +340,28 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
         if (ret < 0)
                 goto err2;
 
-        ret = sh_mtu2_setup_channel(&mtu->channel, mtu);
+        mtu->channels = kzalloc(sizeof(*mtu->channels), GFP_KERNEL);
+        if (mtu->channels == NULL) {
+                ret = -ENOMEM;
+                goto err3;
+        }
+
+        mtu->num_channels = 1;
+
+        mtu->channels[0].base = base;
+
+        ret = sh_mtu2_setup_channel(&mtu->channels[0], mtu);
         if (ret < 0)
                 goto err3;
 
         return 0;
  err3:
+        kfree(mtu->channels);
         clk_unprepare(mtu->clk);
  err2:
         clk_put(mtu->clk);
  err1:
-        iounmap(mtu->channel.base);
+        iounmap(base);
  err0:
         return ret;
 }