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[RFC,1/2] WIP: mfd: syscon: Add register stride to DT bindings.

Message ID 1422267193-6145-1-git-send-email-srinivas.kandagatla@linaro.org
State New
Headers show

Commit Message

Srinivas Kandagatla Jan. 26, 2015, 10:13 a.m. UTC 
This patch adds register stride to dt bindings so that the consumers of
the syscon could change it to there need. One of the the use case for
this feature is Qualcomm qfprom which needs a byte access to regmap
returned from syscon.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 Documentation/devicetree/bindings/mfd/syscon.txt | 3 +++
 drivers/mfd/syscon.c                             | 9 +++++++++
 2 files changed, 12 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/mfd/syscon.txt b/Documentation/devicetree/bindings/mfd/syscon.txt
index fe8150b..7f06ec1 100644
--- a/Documentation/devicetree/bindings/mfd/syscon.txt
+++ b/Documentation/devicetree/bindings/mfd/syscon.txt
@@ -13,6 +13,9 @@  Required properties:
 - compatible: Should contain "syscon".
 - reg: the register region can be accessed from syscon
 
+Optional properties:
+- stride : register address stride in bytes.
+
 Examples:
 gpr: iomuxc-gpr@020e0000 {
 	compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 176bf0f..98769d5 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -48,6 +48,7 @@  static struct syscon *of_syscon_register(struct device_node *np)
 	struct regmap *regmap;
 	void __iomem *base;
 	int ret;
+	u32 stride;
 	struct regmap_config syscon_config = syscon_regmap_config;
 
 	if (!of_device_is_compatible(np, "syscon"))
@@ -69,6 +70,14 @@  static struct syscon *of_syscon_register(struct device_node *np)
 	 else if (of_property_read_bool(np, "little-endian"))
 		syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
 
+	if (!of_property_read_u32(np, "stride", &stride)) {
+		if (stride > 4)
+			stride = 4;
+
+		syscon_config.reg_stride = stride;
+		syscon_config.val_bits = 8 * stride;
+	}
+
 	regmap = regmap_init_mmio(NULL, base, &syscon_config);
 	if (IS_ERR(regmap)) {
 		pr_err("regmap init failed\n");