[PATCH v4 2/4] crypto: caam - do not use mem and emi_slow clock for imx7x

[Rui Miguel Silva]

I.MX7x only use two clocks for the CAAM module, so make sure we do not try to
use the mem and the emi_slow clock when running in that imx7d and imx7s machine
type.

Cc: "Horia Geantă" <horia.gea...@nxp.com>
Cc: Aymen Sghaier <aymen.sgha...@nxp.com>
Cc: Fabio Estevam <fabio.este...@nxp.com>
Cc: Peng Fan <peng....@nxp.com>
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Lukas Auer <lukas.a...@aisec.fraunhofer.de>
Signed-off-by: Rui Miguel Silva <rui.si...@linaro.org>
---
 drivers/crypto/caam/ctrl.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 361e750f9cba..e4cc636e1104 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -337,7 +337,8 @@ static int caam_remove(struct platform_device *pdev)
 
        /* shut clocks off before finalizing shutdown */
        clk_disable_unprepare(ctrlpriv->caam_ipg);
-       clk_disable_unprepare(ctrlpriv->caam_mem);
+       if (ctrlpriv->caam_mem)
+               clk_disable_unprepare(ctrlpriv->caam_mem);
        clk_disable_unprepare(ctrlpriv->caam_aclk);
        if (ctrlpriv->caam_emi_slow)
                clk_disable_unprepare(ctrlpriv->caam_emi_slow);
@@ -466,14 +467,17 @@ static int caam_probe(struct platform_device *pdev)
        }
        ctrlpriv->caam_ipg = clk;
 
-       clk = caam_drv_identify_clk(&pdev->dev, "mem");
-       if (IS_ERR(clk)) {
-               ret = PTR_ERR(clk);
-               dev_err(&pdev->dev,
-                       "can't identify CAAM mem clk: %d\n", ret);
-               return ret;
+       if (!of_machine_is_compatible("fsl,imx7d") &&
+           !of_machine_is_compatible("fsl,imx7s")) {
+               clk = caam_drv_identify_clk(&pdev->dev, "mem");
+               if (IS_ERR(clk)) {
+                       ret = PTR_ERR(clk);
+                       dev_err(&pdev->dev,
+                               "can't identify CAAM mem clk: %d\n", ret);
+                       return ret;
+               }
+               ctrlpriv->caam_mem = clk;
        }
-       ctrlpriv->caam_mem = clk;
 
        clk = caam_drv_identify_clk(&pdev->dev, "aclk");
        if (IS_ERR(clk)) {
@@ -484,7 +488,9 @@ static int caam_probe(struct platform_device *pdev)
        }
        ctrlpriv->caam_aclk = clk;
 
-       if (!of_machine_is_compatible("fsl,imx6ul")) {
+       if (!of_machine_is_compatible("fsl,imx6ul") &&
+           !of_machine_is_compatible("fsl,imx7d") &&
+           !of_machine_is_compatible("fsl,imx7s")) {
                clk = caam_drv_identify_clk(&pdev->dev, "emi_slow");
                if (IS_ERR(clk)) {
                        ret = PTR_ERR(clk);
@@ -501,11 +507,13 @@ static int caam_probe(struct platform_device *pdev)
                return ret;
        }
 
-       ret = clk_prepare_enable(ctrlpriv->caam_mem);
-       if (ret < 0) {
-               dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
-                       ret);
-               goto disable_caam_ipg;
+       if (ctrlpriv->caam_mem) {
+               ret = clk_prepare_enable(ctrlpriv->caam_mem);
+               if (ret < 0) {
+                       dev_err(&pdev->dev, "can't enable CAAM secure mem 
clock: %d\n",
+                               ret);
+                       goto disable_caam_ipg;
+               }
        }
 
        ret = clk_prepare_enable(ctrlpriv->caam_aclk);
@@ -826,7 +834,8 @@ static int caam_probe(struct platform_device *pdev)
 disable_caam_aclk:
        clk_disable_unprepare(ctrlpriv->caam_aclk);
 disable_caam_mem:
-       clk_disable_unprepare(ctrlpriv->caam_mem);
+       if (ctrlpriv->caam_mem)
+               clk_disable_unprepare(ctrlpriv->caam_mem);
 disable_caam_ipg:
        clk_disable_unprepare(ctrlpriv->caam_ipg);
        return ret;
-- 
2.16.2