soc: aspeed: lpc-ctrl: make parameter optional

Making memory-region and flash as optional parameter in device
tree if user needs to use these parameter through ioctl then
need to define in devicetree.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

1 files changed, 36 insertions, 22 deletions

diff --git a/drivers/soc/aspeed/aspeed-lpc-ctrl.c b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
index a024f8042259..aca13779764a 100644
--- a/drivers/soc/aspeed/aspeed-lpc-ctrl.c
+++ b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
@@ -68,6 +68,7 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
                 unsigned long param)
 {
         struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file);
+        struct device *dev = file->private_data;
         void __user *p = (void __user *)param;
         struct aspeed_lpc_ctrl_mapping map;
         u32 addr;
@@ -90,6 +91,12 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
                 if (map.window_id != 0)
                         return -EINVAL;
 
+                /* If memory-region is not described in device tree */
+                if (!lpc_ctrl->mem_size) {
+                        dev_dbg(dev, "Didn't find reserved memory\n");
+                        return -ENXIO;
+                }
+
                 map.size = lpc_ctrl->mem_size;
 
                 return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0;
@@ -126,9 +133,18 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
                         return -EINVAL;
 
                 if (map.window_type == ASPEED_LPC_CTRL_WINDOW_FLASH) {
+                        if (!lpc_ctrl->pnor_size) {
+                                dev_dbg(dev, "Didn't find host pnor flash\n");
+                                return -ENXIO;
+                        }
                         addr = lpc_ctrl->pnor_base;
                         size = lpc_ctrl->pnor_size;
                 } else if (map.window_type == ASPEED_LPC_CTRL_WINDOW_MEMORY) {
+                        /* If memory-region is not described in device tree */
+                        if (!lpc_ctrl->mem_size) {
+                                dev_dbg(dev, "Didn't find reserved memory\n");
+                                return -ENXIO;
+                        }
                         addr = lpc_ctrl->mem_base;
                         size = lpc_ctrl->mem_size;
                 } else {
@@ -196,17 +212,17 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
         if (!lpc_ctrl)
                 return -ENOMEM;
 
+        /* If flash is described in device tree then store */
         node = of_parse_phandle(dev->of_node, "flash", 0);
         if (!node) {
-                dev_err(dev, "Didn't find host pnor flash node\n");
-                return -ENODEV;
-        }
-
-        rc = of_address_to_resource(node, 1, &resm);
-        of_node_put(node);
-        if (rc) {
-                dev_err(dev, "Couldn't address to resource for flash\n");
-                return rc;
+                dev_dbg(dev, "Didn't find host pnor flash node\n");
+        } else {
+                rc = of_address_to_resource(node, 1, &resm);
+                of_node_put(node);
+                if (rc) {
+                        dev_err(dev, "Couldn't address to resource for flash\n");
+                        return rc;
+                }
         }
 
         lpc_ctrl->pnor_size = resource_size(&resm);
@@ -214,22 +230,22 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
 
         dev_set_drvdata(&pdev->dev, lpc_ctrl);
 
+        /* If memory-region is described in device tree then store */
         node = of_parse_phandle(dev->of_node, "memory-region", 0);
         if (!node) {
-                dev_err(dev, "Didn't find reserved memory\n");
-                return -EINVAL;
-        }
+                dev_dbg(dev, "Didn't find reserved memory\n");
+        } else {
+                rc = of_address_to_resource(node, 0, &resm);
+                of_node_put(node);
+                if (rc) {
+                        dev_err(dev, "Couldn't address to resource for reserved memory\n");
+                        return -ENXIO;
+                }
 
-        rc = of_address_to_resource(node, 0, &resm);
-        of_node_put(node);
-        if (rc) {
-                dev_err(dev, "Couldn't address to resource for reserved memory\n");
-                return -ENOMEM;
+                lpc_ctrl->mem_size = resource_size(&resm);
+                lpc_ctrl->mem_base = resm.start;
         }
 
-        lpc_ctrl->mem_size = resource_size(&resm);
-        lpc_ctrl->mem_base = resm.start;
-
         lpc_ctrl->regmap = syscon_node_to_regmap(
                         pdev->dev.parent->of_node);
         if (IS_ERR(lpc_ctrl->regmap)) {
@@ -258,8 +274,6 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
                 goto err;
         }
 
-        dev_info(dev, "Loaded at %pr\n", &resm);
-
         return 0;
 
 err: