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Message-id: <23745449.572421389854083634.JavaMail.weblogic@epml20>
Date: Thu, 16 Jan 2014 06:34:45 +0000 (GMT)
From: Saurabh Singh <saurabh1.s@...sung.com>
To: lgirdwood@...il.com, broonie@...nel.org, grant.likely@...aro.org,
rob.herring@...xeda.com, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, celinux-dev@...e.celinuxforum.org
Cc: srevatsa@...sung.com, bp.praveen@...sung.com
Subject: [PATCH] Parse missing regulator constraints from device tree blob
This patch adds support for parsing following regulator contraints from device tree blob.
1. valid modes mask (valid_modes_mask)
2. input microvolt(input_uV)
3. initial mode (initial_mode)
4. initial state (initial_state)
5. state mem (state_mem)
6. state disk (state_disk)
7. state standby (state_standby)
This patch is currently against a linux 3.12.6 kernel.
diffstat for this patch is:
of_regulator.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
To apply the patch, in the root of a kernel tree use:
patch -p1 < of_regulator.patch
Please let me know any feedback you have on this patch or the approach used.
Regards,
=====================
Saurabh Singh Sengar
Lead Engineer
Samsung R&D Institute
India
Samsung
=====================
Signed-off-by: Saurabh Singh Sengar <saurabh1.s@...sung.com>
--------------------------------------------------------------------------------
--- linux-3.12.6/drivers/regulator/of_regulator.c.orig 2014-01-08 17:19:43.085903573 +0530
+++ linux-3.12.6/drivers/regulator/of_regulator.c 2014-01-15 20:12:22.146543128 +0530
@@ -16,11 +16,40 @@
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
+/**
+ * set_regulator_state_constraints - set regulator state for low power system states
+ * @np: device node for the low power regulator state
+ * @regulator_state: regulator_state structure need to be filled
+ */
+static void set_regulator_state_constraints(struct device_node *np,
+ struct regulator_state *regulator_state)
+{
+ const __be32 *uV, *mode;
+
+ uV = of_get_property(np, "regulator-state-uV", NULL);
+ if (uV)
+ regulator_state->uV = be32_to_cpu(*uV);
+
+ mode = of_get_property(np, "regulator-state-mode", NULL);
+ if (mode)
+ regulator_state->mode = be32_to_cpu(*mode);
+
+ if (of_find_property(np, "regulator-state-enabled", NULL))
+ regulator_state->enabled = true;
+
+ if (of_find_property(np, "regulator-state-disabled", NULL))
+ regulator_state->disabled = true;
+}
+
+
static void of_get_regulation_constraints(struct device_node *np,
struct regulator_init_data **init_data)
{
const __be32 *min_uV, *max_uV, *uV_offset;
const __be32 *min_uA, *max_uA, *ramp_delay;
+ const __be32 *initial_mode, *initial_state;
+ const __be32 *input_uV, *valid_modes_mask;
+ struct device_node *state;
struct property *prop;
struct regulation_constraints *constraints = &(*init_data)->constraints;
@@ -73,6 +102,40 @@ static void of_get_regulation_constraint
else
constraints->ramp_disable = true;
}
+
+ valid_modes_mask = of_get_property(np,
+ "regulator-valid-modes-mask", NULL);
+ if (valid_modes_mask)
+ constraints->valid_modes_mask = be32_to_cpu(*valid_modes_mask);
+
+ input_uV = of_get_property(np, "regulator-input-microvolt", NULL);
+ if (input_uV)
+ constraints->input_uV = be32_to_cpu(*input_uV);
+
+ initial_mode = of_get_property(np, "regulator-initial-mode", NULL);
+ if (initial_mode)
+ constraints->initial_mode = be32_to_cpu(*initial_mode);
+
+ initial_state = of_get_property(np, "regulator-initial-state", NULL);
+ if (initial_state)
+ constraints->initial_state = be32_to_cpu(*initial_state);
+
+ /* regulator state during low power system states */
+ state = of_find_node_by_name(np, "regulator-state-mem");
+ if (state)
+ set_regulator_state_constraints(state,
+ &constraints->state_mem);
+
+ state = of_find_node_by_name(np, "regulator-state-disk");
+ if (state)
+ set_regulator_state_constraints(state,
+ &constraints->state_disk);
+
+ state = of_find_node_by_name(np, "regulator-state-standby");
+ if (state)
+ set_regulator_state_constraints(state,
+ &constraints->state_standby);
+
}
/**
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