clk: si5341: Add silabs,iovdd-33 property

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@calian.com>
Link: https://lore.kernel.org/r/20210325192643.2190069-9-robert.hancock@calian.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
index c5ab4a5ae6a51f45d26ff806886ee55b34ae0a3a..d4aa67a4dc6681750801a30b76d3575aedacef83 100644 (file)
--- 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" */