bus: ti-sysc: Detect i2c interconnect target module based on register layout

We can easily detect i2c based on it's non-standard module registers that
consist of two 32-bit registers accessed in 16-bit mode.

So far we don't have other 16-bit modules, so there's currently no need
to add a custom property for 16-bit register access.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 0c9b9bc..4c1e59e 100644 (file)
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -213,6 +213,21 @@ static int sysc_check_children(struct sysc *ddata)
        return 0;
 }
 
+/*
+ * So far only I2C uses 16-bit read access with clockactivity with revision
+ * in two registers with stride of 4. We can detect this based on the rev
+ * register size to configure things far enough to be able to properly read
+ * the revision register.
+ */
+static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
+{
+       if (resource_size(res) == 8) {
+               dev_dbg(ddata->dev,
+                       "enabling 16-bit and clockactivity quirks\n");
+               ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
+       }
+}
+
 /**
  * sysc_parse_one - parses the interconnect target module registers
  * @ddata: device driver data
@@ -243,6 +258,8 @@ static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
        }
 
        ddata->offsets[reg] = res->start - ddata->module_pa;
+       if (reg == SYSC_REVISION)
+               sysc_check_quirk_16bit(ddata, res);
 
        return 0;
 }

diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
index b76ace0..059be6f 100644 (file)
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -41,6 +41,7 @@ struct sysc_regbits {
        s8 emufree_shift;
 };
 
+#define SYSC_QUIRK_16BIT               BIT(2)
 #define SYSC_QUIRK_UNCACHED            BIT(1)
 #define SYSC_QUIRK_USE_CLOCKACT                BIT(0)