net: qcom/emac: don't try to claim clocks on ACPI systems

On ACPI systems, clocks are not available to drivers directly.  They are
handled exclusively by ACPI and/or firmware, so there is no clock driver.
Calls to clk_get() always fail, so we should not even attempt to claim
any clocks on ACPI systems.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
index ae32f855e31b..422289c232bc 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -460,6 +460,12 @@ static int emac_clks_phase1_init(struct platform_device *pdev,
 {
         int ret;
 
+        /* On ACPI platforms, clocks are controlled by firmware and/or
+         * ACPI, not by drivers.
+         */
+        if (has_acpi_companion(&pdev->dev))
+                return 0;
+
         ret = emac_clks_get(pdev, adpt);
         if (ret)
                 return ret;
@@ -485,6 +491,9 @@ static int emac_clks_phase2_init(struct platform_device *pdev,
 {
         int ret;
 
+        if (has_acpi_companion(&pdev->dev))
+                return 0;
+
         ret = clk_set_rate(adpt->clk[EMAC_CLK_TX], 125000000);
         if (ret)
                 return ret;