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Message-ID: <54FEBA64.3020102@ti.com> Date: Tue, 10 Mar 2015 11:33:24 +0200 From: Peter Ujfalusi <peter.ujfalusi@...com> To: Mark Brown <broonie@...nel.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: regmap: how to support devices with 'nested' pages Hi Mark, I got a device which registers are arranged in 'books' and pages: book0 page0 page1 ... page127 book1 page0 page1 ... page127 ... book255 page0 page1 ... page127 The pages can be selected via register0 of each page (in a standard way), however the book switching can only be done via each book's page0's reg127. With regmap's ranges I can get the pages covered, but with that I can only stay within one book. At power on the chip is at book0, page0. If I want to access book0, page2: write 2 to reg0 // to switch to page2 access to the desired register in book0, page2 Now if I want to access let's say book3, page4: write 0 to reg0 // to switch to page0 of book0 write 3 to reg127 // to switch to book3 write 4 to reg0 // to switch to page4 of book3 access to the desired register Do you know any other device which have similar addressing? Do you have advice on how to handle this? Should I open code the book switching in the driver, which means that I should not use the cache at all in regmap. Thank you, Péter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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