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Date: Tue, 1 Aug 2017 16:58:42 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: sean.wang@...iatek.com, robh+dt@...nel.org, rjw@...ysocki.net,
khilman@...libre.com
Cc: ulf.hansson@...aro.org, devicetree@...r.kernel.org,
linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Chen Zhong <chen.zhong@...iatek.com>
Subject: Re: [PATCH v2 3/3] soc: mediatek: add SCPSYS power domain driver for
MediaTek MT7622 SoC
On 08/01/2017 12:06 PM, sean.wang@...iatek.com wrote:
> From: Chen Zhong <chen.zhong@...iatek.com>
>
> Add SCPSYS power domain driver for MT7622 SoC having four power domains
> which are respectively ETHSYS for Ethernet including embedded switch,
> WBSYS for WIFI and Bluetooth, HIF0SYS for PCI-E and SATA, and HIF1SYS for
> USB. Those functions could be selectively powered gated when the
> corresponding function is no longer to use in order to reach more minimal
> power dissipation.
>
> Signed-off-by: Chen Zhong <chen.zhong@...iatek.com>
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
> drivers/soc/mediatek/mtk-scpsys.c | 81 +++++++++++++++++++++++++++++++++++
> include/linux/soc/mediatek/infracfg.h | 8 +++-
> 2 files changed, 88 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index ceb2cc4..513aa73 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -22,6 +22,7 @@
>
> #include <dt-bindings/power/mt2701-power.h>
> #include <dt-bindings/power/mt6797-power.h>
> +#include <dt-bindings/power/mt7622-power.h>
> #include <dt-bindings/power/mt8173-power.h>
>
> #define SPM_VDE_PWR_CON 0x0210
> @@ -39,6 +40,11 @@
> #define SPM_MFG_2D_PWR_CON 0x02c0
> #define SPM_MFG_ASYNC_PWR_CON 0x02c4
> #define SPM_USB_PWR_CON 0x02cc
> +#define SPM_ETHSYS_PWR_CON 0x02e0 /* MT7622 */
> +#define SPM_HIF0_PWR_CON 0x02e4 /* MT7622 */
> +#define SPM_HIF1_PWR_CON 0x02e8 /* MT7622 */
> +#define SPM_WB_PWR_CON 0x02ec /* MT7622 */
> +
>
> #define SPM_PWR_STATUS 0x060c
> #define SPM_PWR_STATUS_2ND 0x0610
> @@ -64,6 +70,10 @@
> #define PWR_STATUS_MFG_ASYNC BIT(23)
> #define PWR_STATUS_AUDIO BIT(24)
> #define PWR_STATUS_USB BIT(25)
> +#define PWR_STATUS_ETHSYS BIT(24) /* MT7622 */
> +#define PWR_STATUS_HIF0 BIT(25) /* MT7622 */
> +#define PWR_STATUS_HIF1 BIT(26) /* MT7622 */
> +#define PWR_STATUS_WB BIT(27) /* MT7622 */
>
> enum clk_id {
> CLK_NONE,
> @@ -73,6 +83,7 @@ enum clk_id {
> CLK_VENC_LT,
> CLK_ETHIF,
> CLK_VDEC,
> + CLK_HIFSEL,
> CLK_MAX,
> };
>
> @@ -84,6 +95,7 @@ static const char * const clk_names[] = {
> "venc_lt",
> "ethif",
> "vdec",
> + "hif_sel",
> NULL,
> };
>
> @@ -696,6 +708,72 @@ static int __init scpsys_probe_mt6797(struct platform_device *pdev)
> }
>
> /*
> + * MT7622 power domain support
> + */
> +static const struct scp_domain_data scp_domain_data_mt7622[] = {
> + [MT7622_POWER_DOMAIN_ETHSYS] = {
> + .name = "ethsys",
> + .sta_mask = PWR_STATUS_ETHSYS,
> + .ctl_offs = SPM_ETHSYS_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + .clk_id = {CLK_NONE},
> + .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_ETHSYS,
> + .active_wakeup = true,
> + },
> + [MT7622_POWER_DOMAIN_HIF0] = {
> + .name = "hif0",
> + .sta_mask = PWR_STATUS_HIF0,
> + .ctl_offs = SPM_HIF0_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + .clk_id = {CLK_HIFSEL},
> + .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_HIF0,
> + .active_wakeup = true,
> + },
> + [MT7622_POWER_DOMAIN_HIF1] = {
> + .name = "hif1",
> + .sta_mask = PWR_STATUS_HIF1,
> + .ctl_offs = SPM_HIF1_PWR_CON,
> + .sram_pdn_bits = GENMASK(11, 8),
> + .sram_pdn_ack_bits = GENMASK(15, 12),
> + .clk_id = {CLK_HIFSEL},
> + .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_HIF1,
> + .active_wakeup = true,
> + },
> + [MT7622_POWER_DOMAIN_WB] = {
> + .name = "wb",
> + .sta_mask = PWR_STATUS_WB,
> + .ctl_offs = SPM_WB_PWR_CON,
> + .sram_pdn_bits = 0,
> + .sram_pdn_ack_bits = 0,
> + .clk_id = {CLK_NONE},
> + .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_WB,
> + .active_wakeup = true,
> + },
> +};
> +
> +#define NUM_DOMAINS_MT7622 ARRAY_SIZE(scp_domain_data_mt7622)
> +
> +static int __init scpsys_probe_mt7622(struct platform_device *pdev)
> +{
> + struct scp *scp;
> + struct scp_ctrl_reg scp_reg;
> +
> + scp_reg.pwr_sta_offs = SPM_PWR_STATUS;
> + scp_reg.pwr_sta2nd_offs = SPM_PWR_STATUS_2ND;
> +
> + scp = init_scp(pdev, scp_domain_data_mt7622, NUM_DOMAINS_MT7622,
> + &scp_reg);
> + if (IS_ERR(scp))
> + return PTR_ERR(scp);
> +
> + mtk_register_power_domains(pdev, scp, NUM_DOMAINS_MT7622);
> +
> + return 0;
> +}
All the scpsys_probe_mtXXXX are following the same pattern, which get's really
obvious when comparing this function to scpsys_probe_mt2701.
Instead of adding the scpsys_probe_mtXXXX callback to the of_device_id data
pointer, couldn't we pass a struct with a pointer to the scp_domain_data_mtXXXX
array and a possible callback to register the subdomains?
This would reduce code duplication for every new SoC, which starts to bloat the
driver.
Can you implement this as a separate patch of this series? Or do you prefer me
to do so and you just rebase your series on top of that?
Regards,
Matthias
> +
> +/*
> * MT8173 power domain support
> */
>
> @@ -835,6 +913,9 @@ static const struct of_device_id of_scpsys_match_tbl[] = {
> .compatible = "mediatek,mt6797-scpsys",
> .data = scpsys_probe_mt6797,
> }, {
> + .compatible = "mediatek,mt7622-scpsys",
> + .data = scpsys_probe_mt7622,
> + }, {
> .compatible = "mediatek,mt8173-scpsys",
> .data = scpsys_probe_mt8173,
> }, {
> diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h
> index a5714e9..c1e5062 100644
> --- a/include/linux/soc/mediatek/infracfg.h
> +++ b/include/linux/soc/mediatek/infracfg.h
> @@ -20,7 +20,13 @@
> #define MT8173_TOP_AXI_PROT_EN_MFG_M1 BIT(22)
> #define MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT BIT(23)
>
> +#define MT7622_TOP_AXI_PROT_EN_ETHSYS (BIT(3) | BIT(17))
> +#define MT7622_TOP_AXI_PROT_EN_HIF0 (BIT(24) | BIT(25))
> +#define MT7622_TOP_AXI_PROT_EN_HIF1 (BIT(26) | BIT(27) | \
> + BIT(28))
> +#define MT7622_TOP_AXI_PROT_EN_WB (BIT(2) | BIT(6) | \
> + BIT(7) | BIT(8))
> +
> int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask);
> int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask);
> -
> #endif /* __SOC_MEDIATEK_INFRACFG_H */
>
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