> Subject: Re: [PATCH v4 2/4] mailbox: imx: support return value of init > > Hi Peng, > > Am Donnerstag, 25. Januar 2024, 06:20:04 CET schrieb Peng Fan (OSS): > > From: Peng Fan <peng.fan@xxxxxxx> > > > > There will be changes that init may fail, so adding return value for > > init function. > > > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > > --- > > drivers/mailbox/imx-mailbox.c | 35 > > ++++++++++++++++++++++++----------- > > 1 file changed, 24 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/mailbox/imx-mailbox.c > > b/drivers/mailbox/imx-mailbox.c index 656171362fe9..dced4614065f > > 100644 > > --- a/drivers/mailbox/imx-mailbox.c > > +++ b/drivers/mailbox/imx-mailbox.c > > @@ -110,7 +110,7 @@ struct imx_mu_dcfg { > > int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void > > *data); int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp); > > int (*rxdb)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp); - > void > > (*init)(struct imx_mu_priv *priv); > > + int (*init)(struct imx_mu_priv *priv); > > enum imx_mu_type type; > > u32 xTR; /* Transmit Register0 */ > > u32 xRR; /* Receive Register0 */ > > @@ -737,7 +737,7 @@ static struct mbox_chan > *imx_mu_seco_xlate(struct > > mbox_controller *mbox, return imx_mu_xlate(mbox, sp); } > > > > -static void imx_mu_init_generic(struct imx_mu_priv *priv) > > +static int imx_mu_init_generic(struct imx_mu_priv *priv) > > { > > unsigned int i; > > unsigned int val; > > @@ -757,7 +757,7 @@ static void imx_mu_init_generic(struct > imx_mu_priv > > *priv) priv->mbox.of_xlate = imx_mu_xlate; > > > > if (priv->side_b) > > - return; > > + return 0; > > > > /* Set default MU configuration */ > > for (i = 0; i < IMX_MU_xCR_MAX; i++) @@ -770,9 +770,11 @@ static > > void imx_mu_init_generic(struct imx_mu_priv > > *priv) /* Clear any pending RSR */ > > for (i = 0; i < IMX_MU_NUM_RR; i++) > > imx_mu_read(priv, priv->dcfg->xRR + (i % 4) * 4); > > + > > + return 0; > > } > > > > -static void imx_mu_init_specific(struct imx_mu_priv *priv) > > +static int imx_mu_init_specific(struct imx_mu_priv *priv) > > { > > unsigned int i; > > int num_chans = priv->dcfg->type & IMX_MU_V2_S4 ? > IMX_MU_S4_CHANS : > > IMX_MU_SCU_CHANS; @@ -794,12 +796,20 @@ static void > > imx_mu_init_specific(struct imx_mu_priv *priv) /* Set default MU > > configuration */ > > for (i = 0; i < IMX_MU_xCR_MAX; i++) > > imx_mu_write(priv, 0, priv->dcfg->xCR[i]); > > + > > + return 0; > > } > > > > -static void imx_mu_init_seco(struct imx_mu_priv *priv) > > +static int imx_mu_init_seco(struct imx_mu_priv *priv) > > { > > - imx_mu_init_generic(priv); > > + int ret; > > + > > + ret = imx_mu_init_generic(priv); > > + if (ret) > > + return ret; > > priv->mbox.of_xlate = imx_mu_seco_xlate; > > + > > + return 0; > > } > > > > static int imx_mu_probe(struct platform_device *pdev) @@ -866,7 > > +876,11 @@ static int imx_mu_probe(struct platform_device *pdev) > > > > priv->side_b = of_property_read_bool(np, "fsl,mu-side-b"); > > > > - priv->dcfg->init(priv); > > + ret = priv->dcfg->init(priv); > > + if (ret) { > > + dev_err(dev, "Failed to init MU\n"); > > As this is during probe, I rather use dev_err_probe right away. Even if dcfg- > >init won't return -EPROBE_DEFER for now. Let's defer this action until init could return -EPROBE_DEFER. Thanks, Peng. > > Best regards, > Alexander > > > + goto disable_clk; > > + } > > > > spin_lock_init(&priv->xcr_lock); > > > > @@ -878,10 +892,8 @@ static int imx_mu_probe(struct platform_device > *pdev) > > platform_set_drvdata(pdev, priv); > > > > ret = devm_mbox_controller_register(dev, &priv->mbox); > > - if (ret) { > > - clk_disable_unprepare(priv->clk); > > - return ret; > > - } > > + if (ret) > > + goto disable_clk; > > > > pm_runtime_enable(dev); > > > > @@ -899,6 +911,7 @@ static int imx_mu_probe(struct platform_device > > *pdev) > > > > disable_runtime_pm: > > pm_runtime_disable(dev); > > +disable_clk: > > clk_disable_unprepare(priv->clk); > > return ret; > > } > > > -- > TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany > Amtsgericht München, HRB 105018 > Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider > http://www.t/ > q- > group.com%2F&data=05%7C02%7Cpeng.fan%40nxp.com%7C77ae5cd17000 > 42c9a4f008dc1d85b1ba%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7 > C0%7C638417707259707963%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4 > wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7 > C%7C%7C&sdata=OuTmDvQM0MYTBv%2BhwtQNPgd%2BuA9cMKoBIHe%2Fi > Zl9Iu4%3D&reserved=0 >