i3c: master: cdns: Update maximum prescaler value for i2c clock

[ Upstream commit 374c13f9080a1b9835a5ed3e7bea93cf8e2dc262 ]

As per the Cadence IP document fixed the I2C clock divider value limit from
16 bits instead of 10 bits. Without this change setting up the I2C clock to
low frequencies will not work as the prescaler value might be greater than
10 bit number.

I3C clock divider value is 10 bits only. Updating the macro names for both.

Signed-off-by: Harshit Shah <harshitshah.opendev@gmail.com>
Link: https://lore.kernel.org/r/1703927483-28682-1-git-send-email-harshitshah.opendev@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c
index 8f1fda3..fa5aaaf 100644 (file)
--- a/drivers/i3c/master/i3c-master-cdns.c
+++ b/drivers/i3c/master/i3c-master-cdns.c
@@ -76,7 +76,8 @@
 #define PRESCL_CTRL0                   0x14
 #define PRESCL_CTRL0_I2C(x)            ((x) << 16)
 #define PRESCL_CTRL0_I3C(x)            (x)
-#define PRESCL_CTRL0_MAX               GENMASK(9, 0)
+#define PRESCL_CTRL0_I3C_MAX           GENMASK(9, 0)
+#define PRESCL_CTRL0_I2C_MAX           GENMASK(15, 0)
 
 #define PRESCL_CTRL1                   0x18
 #define PRESCL_CTRL1_PP_LOW_MASK       GENMASK(15, 8)
@@ -1233,7 +1234,7 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
                return -EINVAL;
 
        pres = DIV_ROUND_UP(sysclk_rate, (bus->scl_rate.i3c * 4)) - 1;
-       if (pres > PRESCL_CTRL0_MAX)
+       if (pres > PRESCL_CTRL0_I3C_MAX)
                return -ERANGE;
 
        bus->scl_rate.i3c = sysclk_rate / ((pres + 1) * 4);
@@ -1246,7 +1247,7 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
        max_i2cfreq = bus->scl_rate.i2c;
 
        pres = (sysclk_rate / (max_i2cfreq * 5)) - 1;
-       if (pres > PRESCL_CTRL0_MAX)
+       if (pres > PRESCL_CTRL0_I2C_MAX)
                return -ERANGE;
 
        bus->scl_rate.i2c = sysclk_rate / ((pres + 1) * 5);