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Message-ID:
<TY3PR01MB113465C1C90AC41B281208B30862F2@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Tue, 26 Nov 2024 09:30:10 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Claudiu.Beznea <claudiu.beznea@...on.dev>, "vkoul@...nel.org"
<vkoul@...nel.org>, "kishon@...nel.org" <kishon@...nel.org>,
"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>, "geert+renesas@...der.be"
<geert+renesas@...der.be>, "magnus.damm@...il.com" <magnus.damm@...il.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, Yoshihiro Shimoda
<yoshihiro.shimoda.uh@...esas.com>, "christophe.jaillet@...adoo.fr"
<christophe.jaillet@...adoo.fr>
CC: "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, Claudiu.Beznea
<claudiu.beznea@...on.dev>, Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: RE: [PATCH v2 04/15] soc: renesas: rz-sysc: Add SoC detection support
Hi Claudiu,
Thanks for the patch.
> -----Original Message-----
> From: Claudiu <claudiu.beznea@...on.dev>
> Sent: 26 November 2024 09:21
> Subject: [PATCH v2 04/15] soc: renesas: rz-sysc: Add SoC detection support
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> The RZ SYSC controller has registers that keep the SoC ID data. Add driver support to retrieve the SoC
> ID and register a SoC driver.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
Cheers,
Biju
> ---
>
> Changes in v2:
> - this was patch 05/16 in v1
> - changed patch title and description
> - added SoC initialization code in its own function
> - addressed the review comments
> - introduced struct rz_sysc_soc_id_init_data and adjusted the code
> accordingly
> - dropped the RZ/G3S SoC detection code (it will be introduced in
> a separate patch)
>
> drivers/soc/renesas/rz-sysc.c | 72 +++++++++++++++++++++++++++++++++--
> drivers/soc/renesas/rz-sysc.h | 18 +++++++++
> 2 files changed, 86 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/renesas/rz-sysc.c b/drivers/soc/renesas/rz-sysc.c index
> dc0edacd7170..d34d295831b8 100644
> --- a/drivers/soc/renesas/rz-sysc.c
> +++ b/drivers/soc/renesas/rz-sysc.c
> @@ -14,9 +14,12 @@
> #include <linux/refcount.h>
> #include <linux/regmap.h>
> #include <linux/seq_file.h>
> +#include <linux/sys_soc.h>
>
> #include "rz-sysc.h"
>
> +#define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
> +
> /**
> * struct rz_sysc - RZ SYSC private data structure
> * @base: SYSC base address
> @@ -211,6 +214,59 @@ static int rz_sysc_signals_init(struct rz_sysc *sysc,
> return 0;
> }
>
> +static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct
> +of_device_id *match) {
> + const struct rz_sysc_init_data *sysc_data = match->data;
> + const struct rz_sysc_soc_id_init_data *soc_data = sysc_data->soc_id_init_data;
> + struct soc_device_attribute *soc_dev_attr;
> + const char *soc_id_start, *soc_id_end;
> + u32 val, revision, specific_id;
> + struct soc_device *soc_dev;
> + char soc_id[32] = {0};
> + u8 size;
> +
> + if (!soc_data || !soc_data->family || !soc_data->offset ||
> + !soc_data->revision_mask)
> + return -EINVAL;
> +
> + soc_id_start = strchr(match->compatible, ',') + 1;
> + soc_id_end = strchr(match->compatible, '-');
> + size = soc_id_end - soc_id_start;
> + if (size > 32)
> + size = 32;
> + strscpy(soc_id, soc_id_start, size);
> +
> + soc_dev_attr = devm_kzalloc(sysc->dev, sizeof(*soc_dev_attr), GFP_KERNEL);
> + if (!soc_dev_attr)
> + return -ENOMEM;
> +
> + soc_dev_attr->family = soc_data->family;
> + soc_dev_attr->soc_id = devm_kstrdup(sysc->dev, soc_id, GFP_KERNEL);
> + if (!soc_dev_attr->soc_id)
> + return -ENOMEM;
> +
> + val = readl(sysc->base + soc_data->offset);
> + revision = field_get(soc_data->revision_mask, val);
> + specific_id = field_get(soc_data->specific_id_mask, val);
> + soc_dev_attr->revision = devm_kasprintf(sysc->dev, GFP_KERNEL, "%u", revision);
> + if (!soc_dev_attr->revision)
> + return -ENOMEM;
> +
> + if (soc_data->id && specific_id != soc_data->id) {
> + dev_warn(sysc->dev, "SoC mismatch (product = 0x%x)\n", specific_id);
> + return -ENODEV;
> + }
> +
> + dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n", soc_dev_attr->family,
> + soc_dev_attr->soc_id, soc_dev_attr->revision);
> +
> + soc_dev = soc_device_register(soc_dev_attr);
> + if (IS_ERR(soc_dev))
> + return PTR_ERR(soc_dev);
> +
> + return 0;
> +}
> +
> static struct regmap_config rz_sysc_regmap = {
> .name = "rz_sysc_regs",
> .reg_bits = 32,
> @@ -235,14 +291,15 @@ MODULE_DEVICE_TABLE(of, rz_sysc_match); static int rz_sysc_probe(struct
> platform_device *pdev) {
> const struct rz_sysc_init_data *data;
> + const struct of_device_id *match;
> struct device *dev = &pdev->dev;
> - struct rz_sysc *sysc;
> struct regmap *regmap;
> + struct rz_sysc *sysc;
> int ret;
>
> - data = device_get_match_data(dev);
> - if (!data || !data->max_register_offset)
> - return -EINVAL;
> + match = of_match_node(rz_sysc_match, dev->of_node);
> + if (!match || !match->data)
> + return -ENODEV;
>
> sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL);
> if (!sysc)
> @@ -253,6 +310,13 @@ static int rz_sysc_probe(struct platform_device *pdev)
> return PTR_ERR(sysc->base);
>
> sysc->dev = dev;
> + ret = rz_sysc_soc_init(sysc, match);
> + if (ret)
> + return ret;
> +
> + data = match->data;
> + if (!data->max_register_offset)
> + return -EINVAL;
>
> ret = rz_sysc_signals_init(sysc, data->signals_init_data, data->num_signals);
> if (ret)
> diff --git a/drivers/soc/renesas/rz-sysc.h b/drivers/soc/renesas/rz-sysc.h index
> bb850310c931..babca9c743c7 100644
> --- a/drivers/soc/renesas/rz-sysc.h
> +++ b/drivers/soc/renesas/rz-sysc.h
> @@ -35,13 +35,31 @@ struct rz_sysc_signal {
> refcount_t refcnt;
> };
>
> +/**
> + * struct rz_syc_soc_id_init_data - RZ SYSC SoC identification
> +initialization data
> + * @family: RZ SoC family
> + * @id: RZ SoC expected ID
> + * @offset: SYSC SoC ID register offset
> + * @revision_mask: SYSC SoC ID revision mask
> + * @specific_id_mask: SYSC SoC ID specific ID mask */ struct
> +rz_sysc_soc_id_init_data {
> + const char * const family;
> + u32 id;
> + u32 offset;
> + u32 revision_mask;
> + u32 specific_id_mask;
> +};
> +
> /**
> * struct rz_sysc_init_data - RZ SYSC initialization data
> + * @soc_id_init_data: RZ SYSC SoC ID initialization data
> * @signals_init_data: RZ SYSC signals initialization data
> * @num_signals: number of SYSC signals
> * @max_register_offset: Maximum SYSC register offset to be used by the regmap config
> */
> struct rz_sysc_init_data {
> + const struct rz_sysc_soc_id_init_data *soc_id_init_data;
> const struct rz_sysc_signal_init_data *signals_init_data;
> u32 num_signals;
> u32 max_register_offset;
> --
> 2.39.2
>
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