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Subject[PATCHv2 3/5] i2c: i2c-stm32f7: add a new st,stm32mp15-i2c compatible
Date
Add a new stm32mp15 specific compatible to handle FastMode+
registers handling which is different on the stm32mp15 compared
to the stm32f7 or stm32h7.
Indeed, on the stm32mp15, the FastMode+ set and clear registers
are separated while on the other platforms (F7 or H7) the control
is done in a unique register.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
----
v2: adapt struct stm32f7_i2c_dev fmp register variable naming (regmap_ -> fmp_)
---
drivers/i2c/busses/i2c-stm32f7.c | 39 +++++++++++++++++++++++++++++++++------
1 file changed, 33 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index cfe6d790a8fc..8fe7f8caf91b 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -223,6 +223,7 @@ struct stm32f7_i2c_spec {
* @fall_time: Fall time (ns)
* @dnf: Digital filter coefficient (0-16)
* @analog_filter: Analog filter delay (On/Off)
+ * @fmp_clr_offset: Fast Mode Plus clear register offset from set register
*/
struct stm32f7_i2c_setup {
enum stm32_i2c_speed speed;
@@ -232,6 +233,7 @@ struct stm32f7_i2c_setup {
u32 fall_time;
u8 dnf;
bool analog_filter;
+ u32 fmp_clr_offset;
};

/**
@@ -303,7 +305,8 @@ struct stm32f7_i2c_msg {
* @dma: dma data
* @use_dma: boolean to know if dma is used in the current transfer
* @regmap: holds SYSCFG phandle for Fast Mode Plus bits
- * @fmp_reg: register address for setting Fast Mode Plus bits
+ * @fmp_sreg: register address for setting Fast Mode Plus bits
+ * @fmp_creg: register address for clearing Fast Mode Plus bits
* @fmp_mask: mask for Fast Mode Plus bits in set register
* @wakeup_src: boolean to know if the device is a wakeup source
*/
@@ -328,7 +331,8 @@ struct stm32f7_i2c_dev {
struct stm32_i2c_dma *dma;
bool use_dma;
struct regmap *regmap;
- u32 fmp_reg;
+ u32 fmp_sreg;
+ u32 fmp_creg;
u32 fmp_mask;
bool wakeup_src;
};
@@ -386,6 +390,14 @@ static const struct stm32f7_i2c_setup stm32f7_setup = {
.analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
};

+static const struct stm32f7_i2c_setup stm32mp15_setup = {
+ .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
+ .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
+ .dnf = STM32F7_I2C_DNF_DEFAULT,
+ .analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
+ .fmp_clr_offset = 0x40,
+};
+
static inline void stm32f7_i2c_set_bits(void __iomem *reg, u32 mask)
{
writel_relaxed(readl_relaxed(reg) | mask, reg);
@@ -1837,14 +1849,25 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
static int stm32f7_i2c_write_fm_plus_bits(struct stm32f7_i2c_dev *i2c_dev,
bool enable)
{
+ int ret;
+
if (i2c_dev->speed != STM32_I2C_SPEED_FAST_PLUS ||
IS_ERR_OR_NULL(i2c_dev->regmap))
/* Optional */
return 0;

- return regmap_update_bits(i2c_dev->regmap, i2c_dev->fmp_reg,
- i2c_dev->fmp_mask,
- enable ? i2c_dev->fmp_mask : 0);
+ if (i2c_dev->fmp_sreg == i2c_dev->fmp_creg)
+ ret = regmap_update_bits(i2c_dev->regmap,
+ i2c_dev->fmp_sreg,
+ i2c_dev->fmp_mask,
+ enable ? i2c_dev->fmp_mask : 0);
+ else
+ ret = regmap_write(i2c_dev->regmap,
+ enable ? i2c_dev->fmp_sreg :
+ i2c_dev->fmp_creg,
+ i2c_dev->fmp_mask);
+
+ return ret;
}

static int stm32f7_i2c_setup_fm_plus_bits(struct platform_device *pdev,
@@ -1859,10 +1882,13 @@ static int stm32f7_i2c_setup_fm_plus_bits(struct platform_device *pdev,
return 0;

ret = of_property_read_u32_index(np, "st,syscfg-fmp", 1,
- &i2c_dev->fmp_reg);
+ &i2c_dev->fmp_sreg);
if (ret)
return ret;

+ i2c_dev->fmp_creg = i2c_dev->fmp_sreg +
+ i2c_dev->setup.fmp_clr_offset;
+
return of_property_read_u32_index(np, "st,syscfg-fmp", 2,
&i2c_dev->fmp_mask);
}
@@ -2262,6 +2288,7 @@ static const struct dev_pm_ops stm32f7_i2c_pm_ops = {

static const struct of_device_id stm32f7_i2c_match[] = {
{ .compatible = "st,stm32f7-i2c", .data = &stm32f7_setup},
+ { .compatible = "st,stm32mp15-i2c", .data = &stm32mp15_setup},
{},
};
MODULE_DEVICE_TABLE(of, stm32f7_i2c_match);
--
2.7.4
-
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