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Subject[PATCH 12/12] i2c: sh_mobile: use core to detect 'no zero length read' quirk
Date
And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

drivers/i2c/busses/i2c-sh_mobile.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 5fda4188a9e5..9c7f6f8ceb22 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -613,11 +613,6 @@ static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd)
static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg,
bool do_init)
{
- if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) {
- dev_err(pd->dev, "Unsupported zero length i2c read\n");
- return -EOPNOTSUPP;
- }
-
if (do_init) {
/* Initialize channel registers */
iic_wr(pd, ICCR, ICCR_SCP);
@@ -758,6 +753,10 @@ static const struct i2c_algorithm sh_mobile_i2c_algorithm = {
.master_xfer = sh_mobile_i2c_xfer,
};

+static const struct i2c_adapter_quirks sh_mobile_i2c_quirks = {
+ .flags = I2C_AQ_NO_ZERO_LEN_READ,
+};
+
/*
* r8a7740 chip has lasting errata on I2C I/O pad reset.
* this is work-around for it.
@@ -925,6 +924,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)

adap->owner = THIS_MODULE;
adap->algo = &sh_mobile_i2c_algorithm;
+ adap->quirks = &sh_mobile_i2c_quirks;
adap->dev.parent = &dev->dev;
adap->retries = 5;
adap->nr = dev->id;
--
2.11.0
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