From 506bb2ab00753a59c8a63b02e898098815dc3141 Mon Sep 17 00:00:00 2001 From: Manikanta Mylavarapu Date: Mon, 30 Sep 2024 20:17:09 +0530 Subject: [PATCH] i2c: qcom-geni: Support systems with 32MHz serial engine clock In existing socs, I2C serial engine is sourced from XO (19.2MHz). Where as in IPQ5424, I2C serial engine is sourced from GPLL0 (32MHz). The existing map table is based on 19.2MHz. This patch incorporates the clock map table to derive the SCL clock from the 32MHz source clock frequency. Signed-off-by: Manikanta Mylavarapu Reviewed-by: Bjorn Andersson Signed-off-by: Andi Shyti --- drivers/i2c/busses/i2c-qcom-geni.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 212336f724a6..579c01686823 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -16,6 +16,7 @@ #include #include #include +#include #define SE_I2C_TX_TRANS_LEN 0x26c #define SE_I2C_RX_TRANS_LEN 0x270 @@ -146,22 +147,36 @@ struct geni_i2c_clk_fld { * clk_freq_out = t / t_cycle * source_clock = 19.2 MHz */ -static const struct geni_i2c_clk_fld geni_i2c_clk_map[] = { +static const struct geni_i2c_clk_fld geni_i2c_clk_map_19p2mhz[] = { {KHZ(100), 7, 10, 11, 26}, {KHZ(400), 2, 5, 12, 24}, {KHZ(1000), 1, 3, 9, 18}, + {}, +}; + +/* source_clock = 32 MHz */ +static const struct geni_i2c_clk_fld geni_i2c_clk_map_32mhz[] = { + {KHZ(100), 8, 14, 18, 40}, + {KHZ(400), 4, 3, 11, 20}, + {KHZ(1000), 2, 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; + const struct geni_i2c_clk_fld *itr; + + if (clk_get_rate(gi2c->se.clk) == 32 * HZ_PER_MHZ) + itr = geni_i2c_clk_map_32mhz; + else + itr = geni_i2c_clk_map_19p2mhz; - for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) { + while (itr->clk_freq_out != 0) { if (itr->clk_freq_out == gi2c->clk_freq_out) { gi2c->clk_fld = itr; return 0; } + itr++; } return -EINVAL; } -- 2.25.1