From 095561f476abb09c2495b1e0a45a5ebb50a33b27 Mon Sep 17 00:00:00 2001 From: Oliver O'Halloran Date: Thu, 6 Jun 2019 21:52:20 +1000 Subject: [PATCH] i2c: fsi: Create busses for all ports Currently we only create an I2C bus for the ports listed in the device-tree for that master. There's no real reason for this since we can discover the number of ports the master supports by looking at the port_max field of the status register. This patch re-works the bus add logic so that we always create buses for each port, unless the bus is marked as unavailable in the DT. This is useful since it ensures that all the buses provided by the CFAM I2C master are accessible to debug tools. Signed-off-by: Oliver O'Halloran Reviewed-by: Eddie James Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-fsi.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 1e2be2219a60..da5eb3960def 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -658,13 +658,29 @@ static const struct i2c_algorithm fsi_i2c_algorithm = { .functionality = fsi_i2c_functionality, }; +static struct device_node *fsi_i2c_find_port_of_node(struct device_node *fsi, + int port) +{ + struct device_node *np; + u32 port_no; + int rc; + + for_each_child_of_node(fsi, np) { + rc = of_property_read_u32(np, "reg", &port_no); + if (!rc && port_no == port) + return np; + } + + return NULL; +} + static int fsi_i2c_probe(struct device *dev) { struct fsi_i2c_master *i2c; struct fsi_i2c_port *port; struct device_node *np; + u32 port_no, ports, stat; int rc; - u32 port_no; i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); if (!i2c) @@ -678,10 +694,16 @@ static int fsi_i2c_probe(struct device *dev) if (rc) return rc; - /* Add adapter for each i2c port of the master. */ - for_each_available_child_of_node(dev->of_node, np) { - rc = of_property_read_u32(np, "reg", &port_no); - if (rc || port_no > USHRT_MAX) + rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat); + if (rc) + return rc; + + ports = FIELD_GET(I2C_STAT_MAX_PORT, stat) + 1; + dev_dbg(dev, "I2C master has %d ports\n", ports); + + for (port_no = 0; port_no < ports; port_no++) { + np = fsi_i2c_find_port_of_node(dev->of_node, port_no); + if (np && !of_device_is_available(np)) continue; port = kzalloc(sizeof(*port), GFP_KERNEL);