firmware: arm_scmi: Check shmem property for channel availablity

Instead of declaring the channel availabilty unconditionally, let us
check for the presence of "shmem" property and return the channel
availablity accordingly.

Link: https://lore.kernel.org/r/20200327163654.13389-4-sudeep.holla@arm.com
Tested-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index dd4b54c296793f466e3b69d31d81b0171859d845..5929c668dc1d3ae3f22889f9e34bf8404da5bd96 100644 (file)
--- a/drivers/firmware/arm_scmi/smc.c
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -33,6 +33,11 @@ struct scmi_smc {
 
 static bool smc_chan_available(struct device *dev, int idx)
 {
+       struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0);
+       if (!np)
+               return false;
+
+       of_node_put(np);
        return true;
 }