diff options
| author | Biju Das <biju.das.jz@bp.renesas.com> | 2021-06-15 11:54:00 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2021-06-20 23:40:44 +0300 |
| commit | 010e765b406f8e08685ea5b687c63a5ea234719a (patch) | |
| tree | 65c6731681923a78b79bc58c06a87e9a44a94b8d | |
| parent | a431a0914f9276aa70b7075cb43b9cdc537eaf29 (diff) | |
| download | linux-010e765b406f8e08685ea5b687c63a5ea234719a.tar.xz | |
i2c: riic: Add RZ/G2L support
RZ/G2L i2c controller is compatible with RZ/A i2c controller.
By default IP is in reset state, so need to perform release
reset before accessing any register.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
| -rw-r--r-- | drivers/i2c/busses/i2c-riic.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index 4eccc0f69861..78b84445ee6a 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -42,8 +42,10 @@ #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #define RIIC_ICCR1 0x00 #define RIIC_ICCR2 0x04 @@ -86,6 +88,11 @@ #define RIIC_INIT_MSG -1 +enum riic_type { + RIIC_RZ_A, + RIIC_RZ_G2L, +}; + struct riic_dev { void __iomem *base; u8 *buf; @@ -395,7 +402,9 @@ static int riic_i2c_probe(struct platform_device *pdev) struct i2c_adapter *adap; struct resource *res; struct i2c_timings i2c_t; + struct reset_control *rstc; int i, ret; + enum riic_type type; riic = devm_kzalloc(&pdev->dev, sizeof(*riic), GFP_KERNEL); if (!riic) @@ -412,6 +421,17 @@ static int riic_i2c_probe(struct platform_device *pdev) return PTR_ERR(riic->clk); } + type = (enum riic_type)of_device_get_match_data(&pdev->dev); + if (type == RIIC_RZ_G2L) { + rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(rstc)) { + dev_err(&pdev->dev, "Error: missing reset ctrl\n"); + return PTR_ERR(rstc); + } + + reset_control_deassert(rstc); + } + for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) { res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num); if (!res) @@ -472,7 +492,8 @@ static int riic_i2c_remove(struct platform_device *pdev) } static const struct of_device_id riic_i2c_dt_ids[] = { - { .compatible = "renesas,riic-rz" }, + { .compatible = "renesas,riic-r9a07g044", .data = (void *)RIIC_RZ_G2L }, + { .compatible = "renesas,riic-rz", .data = (void *)RIIC_RZ_A }, { /* Sentinel */ }, }; |