[PATCH 1/1] i2c: qcom-geni: add 32MHz I2C SE clock support for IPQ5424

Manikanta Mylavarapu
2024-09-24T06:50:46Z

The IPQ5424 I2C SE clock operates at a frequency of 32MHz. Since the
existing map table is based on 19.2MHz, this patch incorporate the
clock map table to derive the SCL clock from the 32MHz SE clock.

Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@quicinc.com>
---
drivers/i2c/busses/i2c-qcom-geni.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index 212336f724a6..bbd9ecf09f4b 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -71,6 +71,7 @@ enum geni_i2c_err_code {

#define I2C_AUTO_SUSPEND_DELAY 250
#define KHZ(freq) (1000 * freq)
+#define MHZ(freq) (1000000 * freq)
#define PACKING_BYTES_PW 4

#define ABORT_TIMEOUT HZ
@@ -152,11 +153,21 @@ static const struct geni_i2c_clk_fld geni_i2c_clk_map[] = {
{KHZ(1000), 1, 3, 9, 18},
};

+/* source_clock = 32 MHz */
+static const struct geni_i2c_clk_fld geni_i2c_clk_map_32M[] = {
+ {KHZ(100), 7, 14, 18, 40},
+ {KHZ(400), 4, 3, 11, 20},
+ {KHZ(1000), 4, 3, 6, 15},
+};
+
static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
{
int i;
const struct geni_i2c_clk_fld *itr = geni_i2c_clk_map;

+ if (clk_get_rate(gi2c->se.clk) == MHZ(32))
+ itr = geni_i2c_clk_map_32M;
+
for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) {
if (itr->clk_freq_out == gi2c->clk_freq_out) {
gi2c->clk_fld = itr;
--
2.34.1