[PATCH] power: reset: syscon-reboot: add a mask property

[Martin Schiller]

Make the syscon-reboot driver accept value and mask instead of
just value.

Prior to this patch, the property name for the value was 'mask'. If
only the mask property is defined on a node, maintain compatibility
by using it as the value.

This patch is based on commit
f2c199db477e ("power: reset: syscon-poweroff: add a mask property")
and does the same change for the syscon-reboot driver.

Signed-off-by: Martin Schiller <m...@dev.tdt.de>
---
 .../devicetree/bindings/power/reset/syscon-reboot.txt | 11 +++++++++--
 drivers/power/reset/syscon-reboot.c                   | 19 +++++++++++++++++--
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt 
b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
index 11906316b43d..e23dea8344f8 100644
--- a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
+++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
@@ -3,13 +3,20 @@ Generic SYSCON mapped register reset driver
 This is a generic reset driver using syscon to map the reset register.
 The reset is generally performed with a write to the reset register
 defined by the register map pointed by syscon reference plus the offset
-with the mask defined in the reboot node.
+with the value and mask defined in the reboot node.
 
 Required properties:
 - compatible: should contain "syscon-reboot"
 - regmap: this is phandle to the register map node
 - offset: offset in the register map for the reboot register (in bytes)
-- mask: the reset value written to the reboot register (32 bit access)
+- value: the reset value written to the reboot register (32 bit access)
+
+Optional properties:
+- mask: update only the register bits defined by the mask (32 bit)
+
+Legacy usage:
+If a node doesn't contain a value property but contains a mask property, the
+mask property is used as the value.
 
 Default will be little endian mode, 32 bit access only.
 
diff --git a/drivers/power/reset/syscon-reboot.c 
b/drivers/power/reset/syscon-reboot.c
index 7d0d269a0837..5a6bb638c331 100644
--- a/drivers/power/reset/syscon-reboot.c
+++ b/drivers/power/reset/syscon-reboot.c
@@ -27,6 +27,7 @@
 struct syscon_reboot_context {
        struct regmap *map;
        u32 offset;
+       u32 value;
        u32 mask;
        struct notifier_block restart_handler;
 };
@@ -39,7 +40,7 @@ static int syscon_restart_handle(struct notifier_block *this,
                                        restart_handler);
 
        /* Issue the reboot */
-       regmap_write(ctx->map, ctx->offset, ctx->mask);
+       regmap_update_bits(ctx->map, ctx->offset, ctx->mask, ctx->value);
 
        mdelay(1000);
 
@@ -51,6 +52,7 @@ static int syscon_reboot_probe(struct platform_device *pdev)
 {
        struct syscon_reboot_context *ctx;
        struct device *dev = &pdev->dev;
+       int mask_err, value_err;
        int err;
 
        ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
@@ -64,8 +66,21 @@ static int syscon_reboot_probe(struct platform_device *pdev)
        if (of_property_read_u32(pdev->dev.of_node, "offset", &ctx->offset))
                return -EINVAL;
 
-       if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
+       value_err = of_property_read_u32(pdev->dev.of_node, "value", 
&ctx->value);
+       mask_err = of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask);
+       if (value_err && mask_err) {
+               dev_err(dev, "unable to read 'value' and 'mask'");
                return -EINVAL;
+       }
+
+       if (value_err) {
+               /* support old binding */
+               ctx->value = ctx->mask;
+               ctx->mask = 0xFFFFFFFF;
+       } else if (mask_err) {
+               /* support value without mask*/
+               ctx->mask = 0xFFFFFFFF;
+       }
 
        ctx->restart_handler.notifier_call = syscon_restart_handle;
        ctx->restart_handler.priority = 192;
-- 
2.11.0