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The RIIC interface in the Renesas RZ/V2H(P) differs from RZ/A in a couple of ways: - Register offsets for the RZ/V2H(P) SoC differ from those of the RZ/A SoC. - RZ/V2H register access is limited to 8-bit, whereas RZ/A supports 8/16/32-bit. - RZ/V2H has bit differences in the slave address register. To accommodate these differences, a new compatible string "renesas,riic-r9a09g057" is added. Signed-off-by: Lad Prabhakar Reviewed-by: Geert Uytterhoeven Acked-by: Rob Herring Reviewed-by: Wolfram Sang --- v2->v3 - Updated commit description v1->v2 - Used a const for V2H SoC instead of enum in items list --- .../devicetree/bindings/i2c/renesas,riic.yaml | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml index 2291a7cd619b..91ecf17b7a81 100644 --- a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml +++ b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml @@ -15,14 +15,17 @@ allOf: properties: compatible: - items: - - enum: - - renesas,riic-r7s72100 # RZ/A1H - - renesas,riic-r7s9210 # RZ/A2M - - renesas,riic-r9a07g043 # RZ/G2UL and RZ/Five - - renesas,riic-r9a07g044 # RZ/G2{L,LC} - - renesas,riic-r9a07g054 # RZ/V2L - - const: renesas,riic-rz # RZ/A or RZ/G2L + oneOf: + - items: + - enum: + - renesas,riic-r7s72100 # RZ/A1H + - renesas,riic-r7s9210 # RZ/A2M + - renesas,riic-r9a07g043 # RZ/G2UL and RZ/Five + - renesas,riic-r9a07g044 # RZ/G2{L,LC} + - renesas,riic-r9a07g054 # RZ/V2L + - const: renesas,riic-rz # RZ/A or RZ/G2L + + - const: renesas,riic-r9a09g057 # RZ/V2H(P) reg: maxItems: 1 From patchwork Tue Mar 19 13:25:01 2024 Content-Type: text/plain; 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These helper functions lay the groundwork for adding support for the RZ/V2H SoC. This is essential because the register offsets for the RZ/V2H SoC differ from those of the RZ/A SoC. By abstracting the read and write operations, we can seamlessly adapt the driver to support different SoC variants without extensive modifications. This patch is part of the preparation process for integrating support for the RZ/V2H SoC into the RIIC driver. Signed-off-by: Lad Prabhakar --- v2->v3 - Made val as second argument for riic_writeb v1->v2 - Renamed i2c read/write to riic_readb/riic_writeb - Made riic as first parameter for riic_writeb --- drivers/i2c/busses/i2c-riic.c | 56 +++++++++++++++++++++-------------- 1 file changed, 33 insertions(+), 23 deletions(-) diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index e43ff483c56e..ef35e67839fa 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -105,9 +105,19 @@ struct riic_irq_desc { char *name; }; +static inline void riic_writeb(struct riic_dev *riic, u8 val, u8 offset) +{ + writeb(val, riic->base + offset); +} + +static inline u8 riic_readb(struct riic_dev *riic, u8 offset) +{ + return readb(riic->base + offset); +} + static inline void riic_clear_set_bit(struct riic_dev *riic, u8 clear, u8 set, u8 reg) { - writeb((readb(riic->base + reg) & ~clear) | set, riic->base + reg); + riic_writeb(riic, (riic_readb(riic, reg) & ~clear) | set, reg); } static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) @@ -119,7 +129,7 @@ static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) pm_runtime_get_sync(adap->dev.parent); - if (readb(riic->base + RIIC_ICCR2) & ICCR2_BBSY) { + if (riic_readb(riic, RIIC_ICCR2) & ICCR2_BBSY) { riic->err = -EBUSY; goto out; } @@ -127,7 +137,7 @@ static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) reinit_completion(&riic->msg_done); riic->err = 0; - writeb(0, riic->base + RIIC_ICSR2); + riic_writeb(riic, 0, RIIC_ICSR2); for (i = 0, start_bit = ICCR2_ST; i < num; i++) { riic->bytes_left = RIIC_INIT_MSG; @@ -135,9 +145,9 @@ static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) riic->msg = &msgs[i]; riic->is_last = (i == num - 1); - writeb(ICIER_NAKIE | ICIER_TIE, riic->base + RIIC_ICIER); + riic_writeb(riic, ICIER_NAKIE | ICIER_TIE, RIIC_ICIER); - writeb(start_bit, riic->base + RIIC_ICCR2); + riic_writeb(riic, start_bit, RIIC_ICCR2); time_left = wait_for_completion_timeout(&riic->msg_done, riic->adapter.timeout); if (time_left == 0) @@ -191,7 +201,7 @@ static irqreturn_t riic_tdre_isr(int irq, void *data) * value could be moved to the shadow shift register right away. So * this must be after updates to ICIER (where we want to disable TIE)! */ - writeb(val, riic->base + RIIC_ICDRT); + riic_writeb(riic, val, RIIC_ICDRT); return IRQ_HANDLED; } @@ -200,9 +210,9 @@ static irqreturn_t riic_tend_isr(int irq, void *data) { struct riic_dev *riic = data; - if (readb(riic->base + RIIC_ICSR2) & ICSR2_NACKF) { + if (riic_readb(riic, RIIC_ICSR2) & ICSR2_NACKF) { /* We got a NACKIE */ - readb(riic->base + RIIC_ICDRR); /* dummy read */ + riic_readb(riic, RIIC_ICDRR); /* dummy read */ riic_clear_set_bit(riic, ICSR2_NACKF, 0, RIIC_ICSR2); riic->err = -ENXIO; } else if (riic->bytes_left) { @@ -211,7 +221,7 @@ static irqreturn_t riic_tend_isr(int irq, void *data) if (riic->is_last || riic->err) { riic_clear_set_bit(riic, ICIER_TEIE, ICIER_SPIE, RIIC_ICIER); - writeb(ICCR2_SP, riic->base + RIIC_ICCR2); + riic_writeb(riic, ICCR2_SP, RIIC_ICCR2); } else { /* Transfer is complete, but do not send STOP */ riic_clear_set_bit(riic, ICIER_TEIE, 0, RIIC_ICIER); @@ -230,7 +240,7 @@ static irqreturn_t riic_rdrf_isr(int irq, void *data) if (riic->bytes_left == RIIC_INIT_MSG) { riic->bytes_left = riic->msg->len; - readb(riic->base + RIIC_ICDRR); /* dummy read */ + riic_readb(riic, RIIC_ICDRR); /* dummy read */ return IRQ_HANDLED; } @@ -238,7 +248,7 @@ static irqreturn_t riic_rdrf_isr(int irq, void *data) /* STOP must come before we set ACKBT! */ if (riic->is_last) { riic_clear_set_bit(riic, 0, ICIER_SPIE, RIIC_ICIER); - writeb(ICCR2_SP, riic->base + RIIC_ICCR2); + riic_writeb(riic, ICCR2_SP, RIIC_ICCR2); } riic_clear_set_bit(riic, 0, ICMR3_ACKBT, RIIC_ICMR3); @@ -248,7 +258,7 @@ static irqreturn_t riic_rdrf_isr(int irq, void *data) } /* Reading acks the RIE interrupt */ - *riic->buf = readb(riic->base + RIIC_ICDRR); + *riic->buf = riic_readb(riic, RIIC_ICDRR); riic->buf++; riic->bytes_left--; @@ -260,10 +270,10 @@ static irqreturn_t riic_stop_isr(int irq, void *data) struct riic_dev *riic = data; /* read back registers to confirm writes have fully propagated */ - writeb(0, riic->base + RIIC_ICSR2); - readb(riic->base + RIIC_ICSR2); - writeb(0, riic->base + RIIC_ICIER); - readb(riic->base + RIIC_ICIER); + riic_writeb(riic, 0, RIIC_ICSR2); + riic_readb(riic, RIIC_ICSR2); + riic_writeb(riic, 0, RIIC_ICIER); + riic_readb(riic, RIIC_ICIER); complete(&riic->msg_done); @@ -365,15 +375,15 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t) t->scl_rise_ns / (1000000000 / rate), cks, brl, brh); /* Changing the order of accessing IICRST and ICE may break things! */ - writeb(ICCR1_IICRST | ICCR1_SOWP, riic->base + RIIC_ICCR1); + riic_writeb(riic, ICCR1_IICRST | ICCR1_SOWP, RIIC_ICCR1); riic_clear_set_bit(riic, 0, ICCR1_ICE, RIIC_ICCR1); - writeb(ICMR1_CKS(cks), riic->base + RIIC_ICMR1); - writeb(brh | ICBR_RESERVED, riic->base + RIIC_ICBRH); - writeb(brl | ICBR_RESERVED, riic->base + RIIC_ICBRL); + riic_writeb(riic, ICMR1_CKS(cks), RIIC_ICMR1); + riic_writeb(riic, brh | ICBR_RESERVED, RIIC_ICBRH); + riic_writeb(riic, brl | ICBR_RESERVED, RIIC_ICBRL); - writeb(0, riic->base + RIIC_ICSER); - writeb(ICMR3_ACKWP | ICMR3_RDRFS, riic->base + RIIC_ICMR3); + riic_writeb(riic, 0, RIIC_ICSER); 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Tue, 19 Mar 2024 06:26:11 -0700 (PDT) Received: from prasmi.home ([2a00:23c8:2500:a01:3c11:2c6f:3ba9:bab]) by smtp.gmail.com with ESMTPSA id g4-20020adfe404000000b0033dd2a7167fsm12370020wrm.29.2024.03.19.06.26.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Mar 2024 06:26:11 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Chris Brandt , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm , Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v3 3/4] i2c: riic: Pass register offsets and chip details as OF data Date: Tue, 19 Mar 2024 13:25:02 +0000 Message-Id: <20240319132503.80628-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240319132503.80628-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20240319132503.80628-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lad Prabhakar With an increasing number of SoCs reusing this driver, each with slight variations in the RIIC IP, it becomes necessary to support passing these details as OF data. This approach simplifies the extension of the driver for other SoCs. This patch lays the groundwork for adding support for the Renesas RZ/V2H SoC. Signed-off-by: Lad Prabhakar Reviewed-by: Geert Uytterhoeven Reviewed-by: Wolfram Sang --- v2->v3 - Included RB tag from Geert v1->v2 - Dropped family from struct riic_of_data - Included RIIC_REG_END in enum list as flexible array member in a struct with no named members is not allowed --- drivers/i2c/busses/i2c-riic.c | 56 +++++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 15 deletions(-) diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index ef35e67839fa..3cd5033286ca 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -46,18 +46,6 @@ #include #include -#define RIIC_ICCR1 0x00 -#define RIIC_ICCR2 0x04 -#define RIIC_ICMR1 0x08 -#define RIIC_ICMR3 0x10 -#define RIIC_ICSER 0x18 -#define RIIC_ICIER 0x1c -#define RIIC_ICSR2 0x24 -#define RIIC_ICBRL 0x34 -#define RIIC_ICBRH 0x38 -#define RIIC_ICDRT 0x3c -#define RIIC_ICDRR 0x40 - #define ICCR1_ICE 0x80 #define ICCR1_IICRST 0x40 #define ICCR1_SOWP 0x10 @@ -87,6 +75,25 @@ #define RIIC_INIT_MSG -1 +enum riic_reg_list { + RIIC_ICCR1 = 0, + RIIC_ICCR2, + RIIC_ICMR1, + RIIC_ICMR3, + RIIC_ICSER, + RIIC_ICIER, + RIIC_ICSR2, + RIIC_ICBRL, + RIIC_ICBRH, + RIIC_ICDRT, + RIIC_ICDRR, + RIIC_REG_END, +}; + +struct riic_of_data { + u8 regs[RIIC_REG_END]; +}; + struct riic_dev { void __iomem *base; u8 *buf; @@ -94,6 +101,7 @@ struct riic_dev { int bytes_left; int err; int is_last; + const struct riic_of_data *info; struct completion msg_done; struct i2c_adapter adapter; struct clk *clk; @@ -107,12 +115,12 @@ struct riic_irq_desc { static inline void riic_writeb(struct riic_dev *riic, u8 val, u8 offset) { - writeb(val, riic->base + offset); + writeb(val, riic->base + riic->info->regs[offset]); } static inline u8 riic_readb(struct riic_dev *riic, u8 offset) { - return readb(riic->base + offset); + return readb(riic->base + riic->info->regs[offset]); } static inline void riic_clear_set_bit(struct riic_dev *riic, u8 clear, u8 set, u8 reg) @@ -453,6 +461,8 @@ static int riic_i2c_probe(struct platform_device *pdev) } } + riic->info = of_device_get_match_data(&pdev->dev); + adap = &riic->adapter; i2c_set_adapdata(adap, riic); strscpy(adap->name, "Renesas RIIC adapter", sizeof(adap->name)); @@ -497,8 +507,24 @@ static void riic_i2c_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); 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Tue, 19 Mar 2024 06:26:12 -0700 (PDT) Received: from prasmi.home ([2a00:23c8:2500:a01:3c11:2c6f:3ba9:bab]) by smtp.gmail.com with ESMTPSA id g4-20020adfe404000000b0033dd2a7167fsm12370020wrm.29.2024.03.19.06.26.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Mar 2024 06:26:12 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Chris Brandt , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm , Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v3 4/4] i2c: riic: Add support for R9A09G057 SoC Date: Tue, 19 Mar 2024 13:25:03 +0000 Message-Id: <20240319132503.80628-5-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240319132503.80628-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20240319132503.80628-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lad Prabhakar Extend the RIIC driver to support the RZ/V2H(P) ("R9A09G057") SoC. It accomplishes this by appending the compatible string list and passing the RZ/V2H-specific OF data. Signed-off-by: Lad Prabhakar Reviewed-by: Geert Uytterhoeven --- v2->v3 - Included RB tag from Geert v1->v2 - Dropped setting family --- drivers/i2c/busses/i2c-riic.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index 3cd5033286ca..f608b1838cad 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -523,8 +523,25 @@ static const struct riic_of_data riic_rz_a_info = { }, }; +static const struct riic_of_data riic_rz_v2h_info = { + .regs = { + [RIIC_ICCR1] = 0x00, + [RIIC_ICCR2] = 0x01, + [RIIC_ICMR1] = 0x02, + [RIIC_ICMR3] = 0x04, + [RIIC_ICSER] = 0x06, + [RIIC_ICIER] = 0x07, + [RIIC_ICSR2] = 0x09, + [RIIC_ICBRL] = 0x10, + [RIIC_ICBRH] = 0x11, + [RIIC_ICDRT] = 0x12, + [RIIC_ICDRR] = 0x13, + }, +}; + static const struct of_device_id riic_i2c_dt_ids[] = { { .compatible = "renesas,riic-rz", .data = &riic_rz_a_info }, + { .compatible = "renesas,riic-r9a09g057", .data = &riic_rz_v2h_info }, { /* Sentinel */ }, };