linux-kernel - RE: [PATCH] firmware: imx: always export scu symbols

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Message-ID: <DB8PR04MB6795954B70F8C511E780E026E6020@DB8PR04MB6795.eurprd04.prod.outlook.com>
Date:   Thu, 15 Oct 2020 03:17:05 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Ying Liu <victor.liu@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peng Fan <peng.fan@....com>
Subject: RE: [PATCH] firmware: imx: always export scu symbols


Hi Ying,

> -----Original Message-----
> From: Ying Liu <victor.liu@....com>
> Sent: 2020年10月15日 9:33
> To: Joakim Zhang <qiangqing.zhang@....com>; shawnguo@...nel.org;
> s.hauer@...gutronix.de
> Cc: kernel@...gutronix.de; festevam@...il.com; dl-linux-imx
> <linux-imx@....com>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; Peng Fan <peng.fan@....com>
> Subject: Re: [PATCH] firmware: imx: always export scu symbols
> 
> Hi Joakim,
> 
> On Wed, 2020-10-14 at 16:57 +0800, Joakim Zhang wrote:
> > From: Liu Ying <victor.liu@....com>
> >
> > Always export scu symbols for both SCU SoCs and non-SCU SoCs to avoid
> > build error.
> 
> s/scu/SCU/

OK.

> >
> > Signed-off-by: Liu Ying <victor.liu@....com>
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> > ---
> >  include/linux/firmware/imx/ipc.h      | 15 +++++++++++++++
> >  include/linux/firmware/imx/svc/misc.h | 23 +++++++++++++++++++++++
> >  2 files changed, 38 insertions(+)
> >
> > diff --git a/include/linux/firmware/imx/ipc.h
> > b/include/linux/firmware/imx/ipc.h
> > index 891057434858..300fa253fc30 100644
> > --- a/include/linux/firmware/imx/ipc.h
> > +++ b/include/linux/firmware/imx/ipc.h
> > @@ -34,6 +34,7 @@ struct imx_sc_rpc_msg {
> >  	uint8_t func;
> >  };
> >
> > +#if IS_ENABLED(CONFIG_IMX_SCU)
> >  /*
> >   * This is an function to send an RPC message over an IPC channel.
> >   * It is called by client-side SCFW API function shims.
> > @@ -55,4 +56,18 @@ int imx_scu_call_rpc(struct imx_sc_ipc *ipc, void
> > *msg, bool have_resp);
> >   * @return Returns an error code (0 = success, failed if < 0)
> >   */
> >  int imx_scu_get_handle(struct imx_sc_ipc **ipc);
> > +
> > +#else
> > +static inline int
> > +imx_scu_call_rpc(struct imx_sc_ipc *ipc, void *msg, bool have_resp) {
> > +	return -EIO;
> > +}
> > +
> > +static inline int imx_scu_get_handle(struct imx_sc_ipc **ipc) {
> > +	return -EIO;
> > +}
> > +#endif
> > +
> >  #endif /* _SC_IPC_H */
> > diff --git a/include/linux/firmware/imx/svc/misc.h
> > b/include/linux/firmware/imx/svc/misc.h
> > index 031dd4d3c766..d255048f17de 100644
> > --- a/include/linux/firmware/imx/svc/misc.h
> > +++ b/include/linux/firmware/imx/svc/misc.h
> > @@ -46,6 +46,7 @@ enum imx_misc_func {
> >   * Control Functions
> >   */
> >
> > +#if IS_ENABLED(CONFIG_IMX_SCU)
> >  int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
> >  			    u8 ctrl, u32 val);
> >
> > @@ -55,4 +56,26 @@ int imx_sc_misc_get_control(struct imx_sc_ipc *ipc,
> > u32 resource,  int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32
> > resource,
> >  			bool enable, u64 phys_addr);
> >
> > +#else
> > +static inline int
> > +imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
> > +			u8 ctrl, u32 val)
> > +{
> > +	return -EIO;
> > +}
> > +
> > +static inline int
> > +imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
> > +			u8 ctrl, u32 *val)
> > +{
> > +	return -EIO;
> > +}
> > +
> > +static inline int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32
> > resource,
> > +				      bool enable, u64 phys_addr) {
> > +	return -EIO;
> > +}
> > +#endif
> > +
> >  #endif /* _SC_MISC_API_H */
> 
> This is done in our downstream tree. I did this because a downstream display
> driver covers SoCs w/wo SCU. For upstream, I find the drivers can be splited so
> that this is not needed.
> 
> Do you see any existing upstream driver covers SoCs w/wo SCU?
Yes, FlexCAN driver covers SoCs w/wo SCU, so I need this patch to avoid adding IS_ENABLED(CONFIG_IMX_SCU) in FlexCAN driver.

> I think this can be introduced together with the first that kink of driver.
Ok, it seems better, thanks.

Best Regards,
Joakim Zhang
> --
>  Liu Ying