Add a property to allow specifying that the external I2C IO pins are using
3.3V voltage thresholds rather than 1.8V.
Signed-off-by: Robert Hancock <robert.hancock@xxxxxxxxxx>
---
drivers/clk/clk-si5341.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
index 689f8c2b0b57..966b034a318f 100644
--- a/drivers/clk/clk-si5341.c
+++ b/drivers/clk/clk-si5341.c
@@ -81,6 +81,7 @@ struct clk_si5341 {
u8 num_synth;
u16 chip_id;
bool xaxb_ext_clk;
+ bool iovdd_33;
};
#define to_clk_si5341(_hw) container_of(_hw, struct clk_si5341, hw)
@@ -103,6 +104,7 @@ struct clk_si5341_output_config {
#define SI5341_IN_SEL 0x0021
#define SI5341_DEVICE_READY 0x00FE
#define SI5341_XAXB_CFG 0x090E
+#define SI5341_IO_VDD_SEL 0x0943
#define SI5341_IN_EN 0x0949
#define SI5341_INX_TO_PFD_EN 0x094A
@@ -351,7 +353,6 @@ static const struct si5341_reg_default si5341_reg_defaults[] = {
{ 0x0804, 0x00 }, /* Not in datasheet */
{ 0x090E, 0x02 }, /* XAXB_EXTCLK_EN=0 XAXB_PDNB=1 (use XTAL) */
{ 0x091C, 0x04 }, /* ZDM_EN=4 (Normal mode) */
- { 0x0943, 0x00 }, /* IO_VDD_SEL=0 (0=1v8, use 1=3v3) */
{ 0x0949, 0x00 }, /* IN_EN (disable input clocks) */
{ 0x094A, 0x00 }, /* INx_TO_PFD_EN (disabled) */
{ 0x0A02, 0x00 }, /* Not in datasheet */
@@ -1160,6 +1161,11 @@ static int si5341_finalize_defaults(struct clk_si5341 *data)
int res;
u32 revision;
+ res = regmap_write(data->regmap, SI5341_IO_VDD_SEL,
+ data->iovdd_33 ? 1 : 0);
+ if (res < 0)
+ return res;
+
res = regmap_read(data->regmap, SI5341_DEVICE_REV, &revision);
if (res < 0)
return res;
@@ -1544,6 +1550,8 @@ static int si5341_probe(struct i2c_client *client,
}
data->xaxb_ext_clk = of_property_read_bool(client->dev.of_node,
"silabs,xaxb-ext-clk");
+ data->iovdd_33 = of_property_read_bool(client->dev.of_node,
+ "silabs,iovdd-33");
if (initialization_required) {
/* Populate the regmap cache in preparation for "cache only" */
--
2.27.0
