linux-kernel - RE: [PATCH] PCI:cadence:Driver refactored to use as a core library.

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Message-ID: <MWHPR07MB3853A9429698F1A078BE8B1BA1920@MWHPR07MB3853.namprd07.prod.outlook.com>
Date:   Wed, 16 Oct 2019 16:19:53 +0000
From:   Tom Joseph <tjoseph@...ence.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] PCI:cadence:Driver refactored to use as a core library.

Hi Kishon,

> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@...com>
> Sent: 15 October 2019 12:23
> To: Tom Joseph <tjoseph@...ence.com>; linux-pci@...r.kernel.org
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>; Bjorn Helgaas
> <bhelgaas@...gle.com>; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] PCI:cadence:Driver refactored to use as a core library.
> 
> 
> Hi Tom,
> 
> On 01/10/19 4:45 PM, Kishon Vijay Abraham I wrote:
> > Hi Tom,
> >
> > On 30/09/19 10:12 PM, Tom Joseph wrote:
> >> All the platform related APIs/Structures in the driver has been extracted
> >>  out to a separate file (pcie-cadence-plat.c). This will enable the
> >>  driver to be used as a core library, which could be used by other
> >>  platform drivers.Testing was done using simulation environment.
> >>
> >> Signed-off-by: Tom Joseph <tjoseph@...ence.com>
> >> ---
> >>  drivers/pci/controller/Kconfig             |  35 +++++++
> >>  drivers/pci/controller/Makefile            |   1 +
> >>  drivers/pci/controller/pcie-cadence-ep.c   |  78 ++-------------
> >>  drivers/pci/controller/pcie-cadence-host.c |  77 +++------------
> >>  drivers/pci/controller/pcie-cadence-plat.c | 154
> +++++++++++++++++++++++++++++
> >>  drivers/pci/controller/pcie-cadence.h      |  69 +++++++++++++
> >>  6 files changed, 278 insertions(+), 136 deletions(-)
> >>  create mode 100644 drivers/pci/controller/pcie-cadence-plat.c
> >>
> 
> <snip>
> 
> >> diff --git a/drivers/pci/controller/pcie-cadence-plat.c
> b/drivers/pci/controller/pcie-cadence-plat.c
> >> new file mode 100644
> >> index 0000000..274615d
> >> --- /dev/null
> >> +++ b/drivers/pci/controller/pcie-cadence-plat.c
> >> @@ -0,0 +1,154 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +// Copyright (c) 2019 Cadence
> >> +// Cadence PCIe platform  driver.
> >> +// Author: Tom Joseph <tjoseph@...ence.com>
> >> +
> >> +#include <linux/kernel.h>
> >> +#include <linux/of_address.h>
> >> +#include <linux/of_pci.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/pm_runtime.h>
> >> +#include <linux/of_device.h>
> >> +#include "pcie-cadence.h"
> >> +
> >> +/**
> >> + * struct cdns_plat_pcie - private data for this PCIe platform driver
> >> + * @pcie: Cadence PCIe controller
> >> + * @regmap: pointer to PCIe device
> >> + * @is_rc: Set to 1 indicates the PCIe controller mode is Root Complex,
> >> + *         if 0 it is in Endpoint mode.
> >> + */
> >> +struct cdns_plat_pcie {
> >> +	struct cdns_pcie        *pcie;
> >> +	bool is_rc;
> >> +};
> >> +
> >> +struct cdns_plat_pcie_of_data {
> >> +	bool is_rc;
> >> +};
> >> +
> >> +static const struct of_device_id cdns_plat_pcie_of_match[];
> >> +
> >> +int cdns_plat_pcie_link_control(struct cdns_pcie *pcie, bool start)
> >> +{
> >> +	pr_debug(" %s called\n", __func__);
> >> +	return 0;
> >> +}
> >> +
> >> +bool cdns_plat_pcie_link_status(struct cdns_pcie *pcie)
> 
> How do you get cdns_plat_pcie from pcie? Cadence plat doesn't need it
> however
> the platform specific base address will be stored in the platform specific
> structure (struct cdns_plat_pcie here) which will be used for performing
> controller configuration.
> 
> I think you can just move *dev to struct cdns_pcie from struct
> cdns_pcie_ep/struct cdns_pcie_rc and use dev_get_drvdata here to get
> platform
> specific structure.
> 
> Thanks
> Kishon

Thanks. I will update it as suggested.

Regards,
Tom