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Date:   Fri, 24 Sep 2021 15:44:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Pratyush Yadav <p.yadav@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        git@...inx.com, saikrishna12468@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Nobuhiro Iwamatsu <iwamatsu@...auri.org>
Subject: Re: [PATCH 1/4] firmware: xilinx: Add OSPI Mux selection support

On Fri, Sep 24, 2021 at 02:49:09PM +0200, Michal Simek wrote:
> 
> 
> On 9/24/21 2:22 PM, Greg Kroah-Hartman wrote:
> > On Fri, Sep 24, 2021 at 02:12:55PM +0200, Michal Simek wrote:
> >>
> >>
> >> On 9/24/21 1:36 PM, Greg Kroah-Hartman wrote:
> >>> On Fri, Sep 24, 2021 at 03:37:08PM +0530, Sai Krishna Potthuri wrote:
> >>>> Add OSPI Mux selection API support to select the AXI interface to OSPI.
> >>>>
> >>>> Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> >>>> ---
> >>>>  drivers/firmware/xilinx/zynqmp.c     | 17 +++++++++++++++++
> >>>>  include/linux/firmware/xlnx-zynqmp.h | 12 ++++++++++++
> >>>>  2 files changed, 29 insertions(+)
> >>>>
> >>>> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> >>>> index 15b138326ecc..43c3b5a9eef7 100644
> >>>> --- a/drivers/firmware/xilinx/zynqmp.c
> >>>> +++ b/drivers/firmware/xilinx/zynqmp.c
> >>>> @@ -647,6 +647,23 @@ int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type)
> >>>>  }
> >>>>  EXPORT_SYMBOL_GPL(zynqmp_pm_sd_dll_reset);
> >>>>  
> >>>> +/**
> >>>> + * zynqmp_pm_ospi_mux_select() - OSPI Mux selection
> >>>> + *
> >>>> + * @dev_id:	Device Id of the OSPI device.
> >>>> + * @select:	OSPI Mux select value.
> >>>> + *
> >>>> + * This function select the OSPI Mux.
> >>>> + *
> >>>> + * Return:	Returns status, either success or error+reason
> >>>> + */
> >>>> +int zynqmp_pm_ospi_mux_select(u32 dev_id, u32 select)
> >>>> +{
> >>>> +	return zynqmp_pm_invoke_fn(PM_IOCTL, dev_id, IOCTL_OSPI_MUX_SELECT,
> >>>> +				   select, 0, NULL);
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(zynqmp_pm_ospi_mux_select);
> >>>> +
> >>>>  /**
> >>>>   * zynqmp_pm_write_ggs() - PM API for writing global general storage (ggs)
> >>>>   * @index:	GGS register index
> >>>> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> >>>> index 9d1a5c175065..6979a79f553a 100644
> >>>> --- a/include/linux/firmware/xlnx-zynqmp.h
> >>>> +++ b/include/linux/firmware/xlnx-zynqmp.h
> >>>> @@ -119,6 +119,7 @@ enum pm_ioctl_id {
> >>>>  	IOCTL_READ_PGGS = 15,
> >>>>  	/* Set healthy bit value */
> >>>>  	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
> >>>> +	IOCTL_OSPI_MUX_SELECT = 21,
> >>>
> >>> Why the gap?  What are the commands in the middle for?
> >>
> >> Below is the full list. Not everything has been upstream yet. There was
> >> an attempt on AFI which one colleague is working on and should send new
> >> version soon. I don't think anybody has started with upstreaming probe
> >> counters.
> >> Every part has different owner with unfortunately own upstreaming plan.
> >>
> >> Thanks,
> >> Michal
> >>
> >> enum pm_ioctl_id {
> >> 	IOCTL_GET_RPU_OPER_MODE = 0,
> >> 	IOCTL_SET_RPU_OPER_MODE = 1,
> >> 	IOCTL_RPU_BOOT_ADDR_CONFIG = 2,
> >> 	IOCTL_TCM_COMB_CONFIG = 3,
> >> 	IOCTL_SET_TAPDELAY_BYPASS = 4,
> >> 	IOCTL_SET_SGMII_MODE = 5,
> >> 	IOCTL_SD_DLL_RESET = 6,
> >> 	IOCTL_SET_SD_TAPDELAY = 7,
> >> 	IOCTL_SET_PLL_FRAC_MODE = 8,
> >> 	IOCTL_GET_PLL_FRAC_MODE = 9,
> >> 	IOCTL_SET_PLL_FRAC_DATA = 10,
> >> 	IOCTL_GET_PLL_FRAC_DATA = 11,
> >> 	IOCTL_WRITE_GGS = 12,
> >> 	IOCTL_READ_GGS = 13,
> >> 	IOCTL_WRITE_PGGS = 14,
> >> 	IOCTL_READ_PGGS = 15,
> >> 	/* IOCTL for ULPI reset */
> >> 	IOCTL_ULPI_RESET = 16,
> >> 	/* Set healthy bit value */
> >> 	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
> >> 	IOCTL_AFI = 18,
> >> 	/* Probe counter read/write */
> >> 	IOCTL_PROBE_COUNTER_READ = 19,
> >> 	IOCTL_PROBE_COUNTER_WRITE = 20,
> >> 	IOCTL_OSPI_MUX_SELECT = 21,
> >> 	/* IOCTL for USB power request */
> >> 	IOCTL_USB_SET_STATE = 22,
> >> 	/* IOCTL to get last reset reason */
> >> 	IOCTL_GET_LAST_RESET_REASON = 23,
> >> 	/* AI engine NPI ISR clear */
> >> 	IOCTL_AIE_ISR_CLEAR = 24,
> >> 	/* Register SGI to ATF */
> >> 	IOCTL_REGISTER_SGI = 25,
> >> 	/* Runtime feature configuration */
> >> 	IOCTL_SET_FEATURE_CONFIG = 26,
> >> 	IOCTL_GET_FEATURE_CONFIG = 27,
> >> };
> > 
> > Odd mix of comments and no comments...
> > 
> > Anyway, that's fine, just curious as to why there was a gap.  No real
> > reason why you can't just add them all now right?
> 
> Code is firstly integrated to soc tree and then upstream. I would love
> to see this happen vise versa but still marketing wants to deliver
> features first to customers. On the other hand customers care about
> getting features on the first place and they are fine with not having
> upstream solution first.
> Back to your comment. It can also happen while upstreaming that some
> numbers are simply not used because design is changed. That's why that
> numbers can be skipped because it was just temporary solution or not
> proper design.
> It doesn't mean that these numbers can't be listed but on the other hand
> why they should be listed if they shouldn't/can't be used.
> That's why over time we are just adding number which are used by that
> patchset.

Ok, that makes sense to keep this in sync with the newly added features,
that way you don't have the "temporary number" problem.

thanks,

greg k-h

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