i2c: sh_mobile: use core to detect 'no zero length read' quirk

And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 5fda418..9c7f6f8 100644 (file)
--- 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;