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Message-ID: <HK0PR06MB377929E6EA4A1EECEB86E6AD91DF0@HK0PR06MB3779.apcprd06.prod.outlook.com>
Date: Tue, 22 Dec 2020 02:13:33 +0000
From: ChiaWei Wang <chiawei_wang@...eedtech.com>
To: Haiyue Wang <haiyue.wang@...ux.intel.com>,
"lee.jones@...aro.org" <lee.jones@...aro.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"joel@....id.au" <joel@....id.au>,
"andrew@...id.au" <andrew@...id.au>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"minyard@....org" <minyard@....org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
CC: BMC-SW <BMC-SW@...eedtech.com>,
"cyrilbur@...il.com" <cyrilbur@...il.com>,
"rlippert@...gle.com" <rlippert@...gle.com>
Subject: RE: [PATCH v3 3/5] ipmi: kcs: aspeed: Adapt to new LPC DTS layout
Hi Haiyue,
> -----Original Message-----
> From: Haiyue Wang <haiyue.wang@...ux.intel.com>
> Sent: Monday, December 21, 2020 3:59 PM
> Subject: Re: [PATCH v3 3/5] ipmi: kcs: aspeed: Adapt to new LPC DTS layout
>
>
> On 12/21/2020 15:53, Haiyue Wang wrote:
> > On 12/21/2020 13:56, Chia-Wei, Wang wrote:
> >> Add check against LPC device v2 compatible string to ensure that the
> >> fixed device tree layout is adopted.
> >> The LPC register offsets are also fixed accordingly.
> >>
> >> Signed-off-by: Chia-Wei, Wang <chiawei_wang@...eedtech.com>
> >> ---
> >> drivers/char/ipmi/kcs_bmc_aspeed.c | 35
> >> ++++++++++++++++++------------
> >> 1 file changed, 21 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c
> >> b/drivers/char/ipmi/kcs_bmc_aspeed.c
> >> index a140203c079b..6283bfef4ea7 100644
> >> --- a/drivers/char/ipmi/kcs_bmc_aspeed.c
> >> +++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
> >> @@ -27,7 +27,6 @@
> >> #define KCS_CHANNEL_MAX 4
> >> -/* mapped to lpc-bmc@0 IO space */
> >> #define LPC_HICR0 0x000
> >> #define LPC_HICR0_LPC3E BIT(7)
> >> #define LPC_HICR0_LPC2E BIT(6) @@ -52,15
> +51,13 @@
> >> #define LPC_STR1 0x03C
> >> #define LPC_STR2 0x040
> >> #define LPC_STR3 0x044
> >> -
> >> -/* mapped to lpc-host@80 IO space */ -#define
> LPC_HICRB
> >> 0x080
> >> +#define LPC_HICRB 0x100
> >> #define LPC_HICRB_IBFIF4 BIT(1)
> >> #define LPC_HICRB_LPC4E BIT(0) -#define
> LPC_LADR4
> >> 0x090 -#define LPC_IDR4 0x094 -#define
> LPC_ODR4
> >> 0x098 -#define LPC_STR4 0x09C
> >> +#define LPC_LADR4 0x110
> >> +#define LPC_IDR4 0x114
> >> +#define LPC_ODR4 0x118
> >> +#define LPC_STR4 0x11C
> >> struct aspeed_kcs_bmc {
> >> struct regmap *map;
> >> @@ -345,15 +342,25 @@ static int aspeed_kcs_probe(struct
> >> platform_device *pdev)
> >> {
> >> struct device *dev = &pdev->dev;
> >> struct kcs_bmc *kcs_bmc;
> >> - struct device_node *np;
> >> + struct device_node *kcs_np;
> >> + struct device_node *lpc_np;
> >> int rc;
> >
> > I think you can just use 'np' to do LPC compatible checking:
> >
> > np = pdev->dev.of_node->parent;
> >
> > if (!of_device_is_compatible(lpc_np, "aspeed,ast2400-lpc-v2") &&
> > !of_device_is_compatible(lpc_np, "aspeed,ast2500-lpc-v2") &&
> > !of_device_is_compatible(lpc_np, "aspeed,ast2600-lpc-v2")) {
> > dev_err(dev, "unsupported LPC device binding\n");
> > return -ENODEV;
> > }
> >
> Typo:
>
> if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
> !of_device_is_compatible(np, "aspeed,ast2500-lpc-v2") &&
> !of_device_is_compatible(np, "aspeed,ast2600-lpc-v2")) {
> dev_err(dev, "unsupported LPC device binding\n");
> return -ENODEV;
> }
Thanks for the suggestion. Will revise the code after collecting reviewers' feedback.
>
>
> >
> > before:
> >
> > np = pdev->dev.of_node;
> > if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc") ||
> > of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc"))
> >
> > Then the patch is clear. ;-)
> >
> >> - np = pdev->dev.of_node;
> >> - if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc") ||
> >> - of_device_is_compatible(np,
> "aspeed,ast2500-kcs-bmc"))
> >> + kcs_np = dev->of_node;
> >> + lpc_np = kcs_np->parent;
> >> +
> >> + if (!of_device_is_compatible(lpc_np, "aspeed,ast2400-lpc-v2") &&
> >> + !of_device_is_compatible(lpc_np, "aspeed,ast2500-lpc-v2")
> &&
> >> + !of_device_is_compatible(lpc_np, "aspeed,ast2600-lpc-v2")) {
> >> + dev_err(dev, "unsupported LPC device binding\n");
> >> + return -ENODEV;
> >> + }
> >> +
> >> + if (of_device_is_compatible(kcs_np, "aspeed,ast2400-kcs-bmc") ||
> >> + of_device_is_compatible(kcs_np,
> >> +"aspeed,ast2500-kcs-bmc"))
> >> kcs_bmc = aspeed_kcs_probe_of_v1(pdev);
> >> - else if (of_device_is_compatible(np,
> >> "aspeed,ast2400-kcs-bmc-v2") ||
> >> - of_device_is_compatible(np,
> >> "aspeed,ast2500-kcs-bmc-v2"))
> >> + else if (of_device_is_compatible(kcs_np,
> >> "aspeed,ast2400-kcs-bmc-v2") ||
> >> + of_device_is_compatible(kcs_np,
> >> "aspeed,ast2500-kcs-bmc-v2"))
> >> kcs_bmc = aspeed_kcs_probe_of_v2(pdev);
> >> else
> >> return -EINVAL;
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