[RFC/PATCH 4/7] arm: omap: device: add support for generating sysconfig data from DT

Felipe Balbi
2014-12-09T22:27:49Z

After moving sysconfig data to DT, we need to make
sure we can generate the same data we have today in C
files out of the DT provided properties.

This patch adds support for all optional properties
documented by a previous commit.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
arch/arm/mach-omap2/omap_device.c | 115 ++++++++++++++++++++++++++++++++++++++
1 file changed, 115 insertions(+)

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index abd622b..ea729aa 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -25,6 +25,7 @@
*/
#undef DEBUG

+#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -109,6 +110,115 @@ static void _add_hwmod_clocks_clkdev(struct omap_device *od,
_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
}

+static int omap_hwmod_has_sysc_bindings(struct device *dev)
+{
+ struct device_node *node = dev->of_node;
+ char *properties[] = {
+ "ti,rev_offs",
+ "ti,sysc_offs",
+ "ti,syss_offs",
+ "ti,sysc_flags",
+ "ti,srst_udelay",
+ "ti,idlemodes",
+ "ti,clockact",
+ "ti,sysc_type",
+ NULL
+ };
+ char **tmp = properties;
+
+ while (*tmp) {
+ if (of_property_read_bool(node, *tmp)) {
+ return true;
+ }
+ tmp++;
+ }
+
+ return 0;
+}
+
+static int omap_hwmod_init_sysc(struct device *dev,
+ struct omap_hwmod *oh, int index)
+{
+ struct device_node *node = dev->of_node;
+ struct omap_hwmod_class *class = oh->class;
+ struct omap_hwmod_class_sysconfig *sysc;
+ int ret;
+ int i;
+ char name[128];
+ const char *tmp = oh->name;
+ u32 prop;
+
+ /* if data isn't provided by DT, skip */
+ if ((class && class->sysc) || !omap_hwmod_has_sysc_bindings(dev))
+ return 0;
+
+ class = kzalloc(sizeof(*class), GFP_KERNEL);
+ if (!class)
+ return -ENOMEM;
+
+ i = 0;
+ while (*tmp) {
+ if (isalpha(*tmp))
+ name[i++] = *tmp;
+ tmp++;
+ }
+ name[i] = '\0';
+
+ class->name = kzalloc(sizeof(name), GFP_KERNEL);
+ if (!class->name)
+ return -ENOMEM;
+ strncpy(class->name, name, sizeof(name) - 1);
+
+ sysc = kzalloc(sizeof(*sysc), GFP_KERNEL);
+ if (!sysc)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_index(node, "ti,rev_offs", index, &prop);
+ if (!ret)
+ sysc->rev_offs = prop;
+
+ ret = of_property_read_u32_index(node, "ti,sysc_offs", index, &prop);
+ if (!ret)
+ sysc->sysc_offs = prop;
+
+ ret = of_property_read_u32_index(node, "ti,syss_offs", index, &prop);
+ if (!ret)
+ sysc->syss_offs = prop;
+
+ ret = of_property_read_u32_index(node, "ti,sysc_flags", index, &prop);
+ if (!ret)
+ sysc->sysc_flags = prop & 0xffff;
+
+ ret = of_property_read_u32_index(node, "ti,srst_udelay", index, &prop);
+ if (!ret)
+ sysc->srst_udelay = prop & 0xff;
+
+ ret = of_property_read_u32_index(node, "ti,idlemodes", index, &prop);
+ if (!ret)
+ sysc->idlemodes = prop & 0xff;
+
+ ret = of_property_read_u32_index(node, "ti,clockact", index, &prop);
+ if (!ret)
+ sysc->clockact = prop & 0xff;
+
+ ret = of_property_read_u32_index(node, "ti,sysc_type", index, &prop);
+ if (ret)
+ prop = 1;
+
+ switch (prop) {
+ case 2:
+ sysc->sysc_fields = &omap_hwmod_sysc_type2;
+ break;
+ case 3:
+ sysc->sysc_fields = &omap_hwmod_sysc_type3;
+ break;
+ case 1:
+ default:
+ sysc->sysc_fields = &omap_hwmod_sysc_type1;
+ }
+
+ return 0;
+}

/**
* omap_device_build_from_dt - build an omap_device with multiple hwmods
@@ -154,6 +264,11 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
goto odbfd_exit1;
}
hwmods[i] = oh;
+
+ ret = omap_hwmod_init_sysc(&pdev->dev, oh, i);
+ if (ret)
+ goto odbfd_exit1;
+
if (oh->flags & HWMOD_INIT_NO_IDLE)
device_active = true;

--
2.2.0