[PATCH 04/10] mmc: Add invert flag for clock phase signedness

Chin-Ting Kuo
2021-09-22T10:32:24Z

The clock phase degree may be between -360 to 360.
If the data signal is leading to the clock, the signedness
of clock phase is postive, otherwise, the signedness
is negative.

Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
---
drivers/mmc/core/host.c | 10 ++++++----
include/linux/mmc/host.h | 2 ++
2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index d4683b1d263f..c2de7cbc7838 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -214,14 +214,16 @@ static void mmc_retune_timer(struct timer_list *t)
static void mmc_of_parse_timing_phase(struct device *dev, const char *prop,
struct mmc_clk_phase *phase)
{
- int degrees[2] = {0};
+ int degrees[4] = {0};
int rc;

- rc = device_property_read_u32_array(dev, prop, degrees, 2);
+ rc = device_property_read_u32_array(dev, prop, degrees, 4);
phase->valid = !rc;
if (phase->valid) {
- phase->in_deg = degrees[0];
- phase->out_deg = degrees[1];
+ phase->inv_in_deg = degrees[0] ? true : false;
+ phase->in_deg = degrees[1];
+ phase->inv_out_deg = degrees[2] ? true : false;
+ phase->out_deg = degrees[3];
}
}

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 0c0c9a0fdf57..3c13010683e0 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -82,7 +82,9 @@ struct mmc_ios {

struct mmc_clk_phase {
bool valid;
+ bool inv_in_deg;
u16 in_deg;
+ bool inv_out_deg;
u16 out_deg;
};

--
2.17.1